Introduction
For technology companies, pharmaceutical firms, manufacturers, and indeed any business that depends on innovation, the question of who owns an invention can be the single most consequential legal issue it faces. A startup that has developed breakthrough software, a medical device company that has invested years in a novel diagnostic tool, or an industrial manufacturer that has perfected a proprietary process all share a common vulnerability: if the inventors who created those innovations have not properly assigned their rights to the company, the company may not own what it believes it owns. The consequences of that gap can be catastrophic—invalidated patents, unenforceable licensing agreements, fractured investor relationships, and the prospect of a departing employee claiming co-ownership of the company’s core technology.
Invention assignment agreements—also called proprietary information and invention assignment agreements (PIIAs) or intellectual property assignment agreements—are the legal instruments businesses use to ensure that inventions created by their employees and contractors vest in the company rather than in the individuals who conceived them. This article explains how invention assignment law works in the United States, what a well-drafted invention assignment agreement should contain, the important statutory limitations that several states impose on such agreements, how assignment interacts with patent prosecution and ownership, the distinct considerations that apply to independent contractors, and the best practices that counsel recommends to clients at every stage of growth.
1. The Default Rule and Why It Matters
A foundational principle of U.S. patent law is that patent rights belong initially to the inventor. Under 35 U.S.C. § 101 and longstanding Supreme Court precedent, it is the human being who conceives of an invention who holds the original patent right—not the employer, not the investor, and not the contracting company that paid for the research. This is true even when the inventor conceives of the invention entirely on company time, using company resources, and in direct pursuit of company objectives. The legal mechanism that transfers those rights from the inventor to the company is the assignment.
This starting point surprises many business owners and even some founders who assume, quite reasonably, that work product generated by their employees in the course of employment belongs to the employer. While that intuition is largely correct for copyright purposes—where the work-made-for-hire doctrine automatically vests copyright in employers for qualifying works—no analogous doctrine applies to patents. There is a partial exception, known as the “hired to invent” doctrine or the “shop right” doctrine, but neither provides the complete and transferable ownership that businesses require.
The Hired-to-Invent Doctrine
Courts have long recognized that when an employee is specifically hired for the purpose of inventing—that is, when invention is the core, defined function of the role—the employer may have an implied right to own the resulting invention without a formal written assignment. This “hired to invent” doctrine rests on the idea that the employer is, in effect, purchasing the invention when it hires the inventor to create it. However, the doctrine is narrow and unreliable. It applies only where the employment relationship unambiguously contemplates invention as its central purpose; it does not apply simply because an employee happens to invent something in the course of performing a more general job. Because the boundaries of the doctrine are determined by courts on a case-by-case basis, relying on it in lieu of a written agreement is a gamble no well-counseled business should take.
Shop Rights
A related doctrine, the shop right, gives an employer a non-exclusive, royalty-free, irrevocable license to use an invention that an employee developed using the employer’s resources or on the employer’s time, even in the absence of an assignment agreement. While a shop right prevents the employer from being entirely locked out of its own technology, it is a limited and unsatisfying remedy. A shop right is non-transferable, meaning the employer cannot sell, license, or otherwise transfer it to a third party. It does not give the employer the right to exclude others, including competitors, from practicing the invention. And it does not give the employer any interest in any patent that might issue. A shop right is, in practical terms, the consolation prize available to employers who failed to obtain a proper written assignment.
2. What a Well-Drafted Invention Assignment Agreement Should Contain
The core purpose of an invention assignment agreement is to transfer to the company all right, title, and interest in inventions conceived or developed by the employee in connection with the company’s business or using the company’s resources. A thorough agreement goes considerably beyond a bare assignment clause. The following components represent the standard of care in sophisticated employment agreements.
Scope of Assigned Inventions
The agreement should define with precision which inventions are assigned to the company. A well-crafted definition typically covers inventions that (a) relate to the company’s current or reasonably anticipated business, research, or development; (b) result from work performed for the company; or (c) are made using the company’s equipment, facilities, supplies, trade secrets, or confidential information. The definition should be broad enough to capture inventions that arise from the employee’s work but narrow enough to survive legal scrutiny in jurisdictions with statutory carve-outs, discussed below. Some agreements also extend to inventions conceived during a specified period following the end of employment, where permitted by law, in order to address inventions that had begun gestating during employment but were reduced to practice after departure.
Present Assignment vs. Agreement to Assign
A critically important drafting distinction—one that has been the subject of significant litigation—is the difference between a present assignment and a covenant to assign. A present assignment uses language such as “Employee hereby assigns” and operates to transfer rights automatically at the moment of invention, without any further act by the employee. A covenant to assign uses language such as “Employee agrees to assign” and creates only a contractual obligation that the employee will execute an assignment in the future. The Federal Circuit’s decision in Stanford v. Roche (2011), affirmed by the Supreme Court, underscored the importance of this distinction: a prior present assignment to a third party—such as to a university under a research agreement—can defeat a subsequent assignment even when the later assignment relates to the same invention. Employers should use present-assignment language and require employees to execute any further instruments of assignment upon request, at no additional consideration.
Disclosure Obligations
The agreement should require the employee to promptly disclose to the company any invention, discovery, development, or improvement that falls within the scope of the agreement, whether or not the employee believes it to be patentable. Timely disclosure is essential for the company to evaluate patentability, make strategic filing decisions, and ensure it can meet the one-year statutory bar under 35 U.S.C. § 102 for U.S. patent applications. Many agreements require disclosure within a specified period—commonly ten to thirty days—of the invention’s conception or first reduction to practice.
Cooperation Obligations
The employee should be obligated to assist the company, both during and after employment, in obtaining and enforcing patent protection for assigned inventions. This includes executing formal assignment documents, declaration and oath forms for patent applications, and any other instruments the company’s patent counsel requires. Because patent prosecution can extend for years after an employee departs, it is prudent to include a power of attorney authorizing a designated officer or counsel of the company to execute such instruments on the employee’s behalf if the employee is unavailable or uncooperative, to the extent permitted by applicable law.
Exclusion of Prior Inventions
To avoid disputes about whether a particular invention was conceived before employment began, employees should be asked to disclose—on a schedule attached to the agreement—any inventions, improvements, or original works that they own or co-own prior to employment that they wish to exclude from the agreement’s scope. If the employee discloses nothing, the agreement should recite that there are no such prior inventions. This creates a clean record that significantly reduces the risk of a departing employee later claiming that a key company invention was actually a pre-existing personal project.
Integration with Confidentiality Provisions
Invention assignment agreements almost always accompany broader employment agreements that address confidentiality of proprietary information, non-solicitation of employees and customers, and (where legally permitted) non-competition. These provisions are mutually reinforcing: confidential information obligations protect the information that feeds the inventive process; invention assignment provisions ensure the fruits of that process belong to the employer; and restrictive covenants protect the company’s investment during and after the employment relationship. Together, these provisions constitute the comprehensive intellectual property protection framework that investors and acquirers expect to see in due diligence.
3. Statutory Limitations: What Employers Cannot Require
Invention assignment agreements are subject to important statutory limitations in a growing number of states. These statutes carve out categories of inventions that an employer cannot require an employee to assign, regardless of what the contract says. Businesses that operate in multiple states, or that hire remote employees across the country, must be attentive to these variations.
California
California Labor Code Section 2870 is the most influential of these statutes and serves as the model for many others. It provides that an employment agreement cannot require an employee to assign rights to an invention that the employee developed entirely on their own time, without using the employer’s equipment, supplies, facilities, or trade secret information, and that does not (a) relate at the time of conception or reduction to practice to the employer’s business or to the employer’s actual or demonstrably anticipated research or development, or (b) result from any work performed by the employee for the employer. California Labor Code Section 2872 requires that any employment agreement governed by California law that includes an invention assignment provision must include notice of this statutory limitation. Failure to include the required notice does not void the agreement, but it eliminates the employer’s ability to argue that the employee was unaware of their rights. California also prohibits assignment of inventions that an employee conceived after the end of employment unless the invention relates to the former employer’s business or was derived from the former employer’s confidential information.
Other States with Similar Protections
Delaware, Illinois, Minnesota, North Carolina, Washington, and several other states have enacted statutes modeled on California’s Section 2870, each with variations in scope and language. Illinois, for example, restricts assignment of inventions that do not relate to the employer’s business and that result from no use of the employer’s resources, similar to California but with minor definitional differences. Washington’s statute provides parallel protections and applies to all employment agreements regardless of where the employer is incorporated. Minnesota’s statute is particularly notable in that it explicitly covers both inventions and improvements. Employers should review the law of every state in which they employ workers, not merely the state of incorporation or principal place of business, and should include state-specific carve-out language in their agreements accordingly.
Practical Compliance
The practical approach to multi-state compliance is to include in the invention assignment agreement a general carve-out that mirrors the California statutory standard—protecting inventions developed entirely on personal time without employer resources and unrelated to the employer’s business—and to supplement it with state-specific addenda for employees in states with divergent requirements. Agreements should also include choice-of-law provisions, though courts in protective states such as California may decline to apply a different state’s law if doing so would deprive a California employee of the protections of Section 2870.
4. Invention Assignment and Patent Prosecution
The intersection of invention assignment agreements and the formal patent prosecution process is a source of recurring practical complexity. Understanding how assignments interact with patent filing obligations is essential for companies seeking to build a defensible patent portfolio.
Recording Assignments at the USPTO
Under 35 U.S.C. § 261, patents and patent applications are assignable by written instrument. Assignments may be recorded with the United States Patent and Trademark Office (USPTO), and recordation provides constructive notice to the public of the assignment. The USPTO’s regulations at 37 C.F.R. § 3.11–3.81 govern the recordation process. While recordation is not required for the assignment to be legally effective as between the parties, a failure to record creates risk: a subsequent bona fide purchaser for value who records first will take priority over an unrecorded assignment. Companies that obtain invention assignments from employees should promptly record those assignments, or at minimum record an assignment covering each patent application at or shortly after filing.
Applicant and Assignee Status
Following the America Invents Act (AIA) of 2011, a company that has obtained a written assignment from the inventor may file a patent application as the applicant directly, without the inventor being listed as applicant. Prior to the AIA, patent applications had to be filed in the name of the inventors; the company would be listed as assignee. Under the current rules, either approach remains available, but filing in the name of the assignee company streamlines prosecution and reduces complications in cases where inventors are unavailable or uncooperative. Even where the application is filed by the company as applicant, the inventors must still be identified, and they are still required to execute an oath or declaration.
Gaps in the Assignment Chain
One of the most damaging findings in a patent due diligence review is a gap in the assignment chain—a break in the documented chain of title from inventor to the company (or its successor). Such gaps arise when assignment agreements were never executed, when agreements were executed but not properly recorded, when the company changed names or underwent a merger without proper assignment of the patent portfolio, or when an inventor is a co-inventor with a third party whose rights were never obtained. A patent with a broken chain of title may be unenforceable against infringers and may not be licensable. Investors and acquirers routinely conduct patent chain-of-title audits, and defects discovered at that stage can delay or kill transactions. Companies should conduct periodic internal audits to verify that every issued patent and pending application has a complete, recorded chain of title to the current entity.
5. Independent Contractors: A Distinct and Higher-Risk Context
The challenges of invention ownership are, if anything, more acute in the context of independent contractors than employees. As discussed in the context of copyright, there is no automatic work-made-for-hire principle for patents; even for copyright purposes, most contractor-created works require a written agreement to be treated as works for hire. For patents, there is no work-made-for-hire equivalent at all: an independent contractor who invents something in the course of performing services for a company owns that invention outright, unless a written assignment has been executed.
This is a particularly acute risk for startups and early-stage companies that rely heavily on contract developers, contract engineers, and consulting arrangements—often without the formal contracting infrastructure of a mature organization. It is not uncommon to encounter companies that have been built on technology developed by contractors who signed no assignment agreement and who may, years later, assert ownership claims over foundational intellectual property. Resolving such disputes is expensive and uncertain; preventing them with a timely written assignment is trivially simple by comparison.
Every services agreement with an independent contractor who will be developing, inventing, or otherwise creating intellectual property on the company’s behalf should include (a) a present, unconditional assignment of all inventions, discoveries, and improvements arising from the engagement; (b) a cooperation clause requiring the contractor to execute further instruments of assignment; and (c) a representation that the contractor has the right to make the assignment—i.e., that the invention is not subject to any pre-existing obligation to a third party. Where the contractor is an entity rather than an individual, the agreement should also address the rights of the individual human inventors within the contractor organization, ideally requiring the contractor to obtain and pass through their assignments.
6. Joint Inventorship and Joint Ownership
Joint inventorship is another area of significant practical complexity. Under U.S. patent law, all individuals who contribute to the conception of at least one claim of a patent must be listed as inventors. Conception, in patent law, is the mental formulation of the complete and operative invention, as distinguished from reduction to practice (actually building or testing it). If two engineers at a company collaborate on an invention, both must be named as inventors on any resulting patent application. If an outside consultant also contributed to conception, the consultant must be named as well.
Joint inventorship creates joint ownership by operation of law, unless one or more of the joint inventors assigns their rights. This has a consequence that surprises many business owners: under 35 U.S.C. § 262, each joint owner of a patent may independently exploit the patent without accounting to the other joint owners. This means that if a company’s employee and an outside consultant co-invented a patented technology, and the consultant never signed an assignment agreement, the consultant—or anyone to whom the consultant subsequently assigns their interest—can freely license the technology to the company’s competitors, with no obligation to share proceeds with the company. The company cannot prevent this.
Joint inventorship situations arise frequently in collaborative research arrangements, university partnerships, government-funded research, and joint ventures. In each of these contexts, the ownership and licensing of resulting inventions must be addressed contractually before the collaboration begins. Collaborative research agreements should specify who will own inventions made solely by each party’s personnel, how joint inventions will be owned and licensed, and how patent prosecution costs will be allocated. These provisions require careful negotiation, particularly in the university context where federal law (the Bayh-Dole Act) imposes additional constraints on the commercialization of inventions arising from federally funded research.
7. Timing and Enforceability of Assignment Agreements
Invention assignment agreements are most effective—and most clearly enforceable—when they are signed at the inception of the employment or contractor relationship, before the employee or contractor begins work. An agreement signed on the first day of employment, as part of the onboarding package, presents no consideration issues: the offer of employment itself constitutes adequate consideration for the employee’s promises. The practical and legal complications arise when employers attempt to obtain invention assignment agreements from existing employees who were never asked to sign one, or when they seek to expand the scope of an existing agreement.
Consideration for Mid-Employment Agreements
In most U.S. jurisdictions, a promise requires consideration to be enforceable—something of value flowing from the employer to the employee in exchange for the employee’s assignment obligations. Simply continuing employment is generally held to be insufficient consideration for a new restrictive covenant or assignment agreement in jurisdictions that do not follow the at-will employment doctrine’s continuation-of-employment theory. Some states require independent, additional consideration such as a signing bonus, additional benefits, or a meaningful change in role. Before asking existing employees to sign new or amended invention assignment agreements, employers should consult with employment counsel on the applicable law in each relevant jurisdiction and structure the consideration accordingly.
Retroactive Coverage
Agreements that purport to assign inventions that were conceived before the agreement was signed require careful analysis. Such retroactive coverage may be enforceable if supported by adequate consideration, but it raises factual questions about whether a prior invention was truly conceived before or after the agreement’s effective date. These disputes are best avoided by requiring agreement at the outset of employment, by maintaining thorough invention disclosure records, and by documenting in the employee schedule of prior inventions any pre-existing work the employee brings to the relationship.
8. The Role of Invention Assignments in Corporate Transactions
Mergers, acquisitions, and financing rounds shine a particularly bright light on a company’s intellectual property ownership practices. Acquirers and investors conducting due diligence will scrutinize the company’s IP assignment records, and deficiencies can be transaction-threatening or deal-pricing events. The following categories of issues arise most frequently.
First, founders. In the rush of building an early product, founders frequently neglect to formally assign their own inventions to the company entity. If Founder A invented the core algorithm before the company was incorporated, and then transferred it informally to the company without a written assignment, the company may not legally own it. Investors routinely require certifications or representations that founders have executed valid invention assignment agreements and that the company owns all technology the founders developed in connection with the business.
Second, pre-incorporation work. Technology developed by founders or early employees before the company’s legal formation belongs either to the individuals who created it or, if created within a prior entity, to that entity. A new corporation does not automatically acquire ownership of pre-incorporation IP. Formal assignment agreements must be executed at or near the time of incorporation to transfer this technology cleanly into the new entity.
Third, legacy contractor engagements. Early-stage companies that relied on contract developers or design firms frequently discover during due diligence that significant portions of their codebase or product design were developed under agreements that lacked IP assignment provisions, or that were oral understandings with no written agreement at all. Remediation at the transaction stage—hunting down former contractors years after the fact—is time-consuming, expensive, and not always successful. Some former contractors may demand significant compensation to execute retroactive assignments; others may be unreachable. The resulting cloud on title can require purchase price adjustments, escrow arrangements, or in severe cases, the transaction may not close.
Fourth, government-funded research. Companies that received federal grants or used federally funded facilities must comply with the Bayh-Dole Act (35 U.S.C. §§ 200–212), which grants the government a license in inventions arising from federal funding and imposes obligations regarding disclosure, election of title, and preference for U.S. manufacturing. Acquirers of companies with federally funded research will scrutinize Bayh-Dole compliance carefully, as defects in compliance can result in forfeiture of patent rights to the government.
9. Best Practices for Building a Robust Assignment Program
The following recommendations represent the standard framework that counsel advises businesses to implement, regardless of size or stage of development.
Onboarding as the Critical Checkpoint
Every employee and contractor who will perform any role related to product development, research, engineering, design, or innovation should sign a properly drafted PIIA before beginning work—not after. The PIIA should be reviewed by qualified legal counsel, not assembled from a template found online, since the statutory requirements vary by state and a one-size-fits-all approach creates compliance risk. For employees in California, Illinois, Minnesota, Washington, and other states with statutory carve-outs, the agreement should include the required statutory notice and the appropriate carve-out language.
Maintain an Invention Disclosure Program
Companies with meaningful R&D activity should implement a formal invention disclosure program, through which employees report potentially patentable inventions to a designated committee or officer for evaluation. Such programs serve multiple purposes: they create a contemporaneous record of inventive activity (useful in any priority dispute), they ensure that the company has an opportunity to evaluate and protect valuable innovations before they are inadvertently disclosed, and they create a culture of IP awareness within the technical team. The disclosure form should capture the names of all inventors, a description of the invention, the date of conception, the date of first reduction to practice, any public disclosures, and the inventor’s confirmation that the invention is being disclosed pursuant to the PIIA.
Conduct Periodic IP Audits
At least annually, and in advance of any significant financing or transaction, companies should conduct an internal audit of their IP ownership position. The audit should verify that all current and former employees and contractors who contributed to the company’s IP have signed appropriate assignment agreements, that all patent applications and issued patents have a recorded chain of title to the current entity, and that any gaps or deficiencies have been identified and a remediation plan is in place. Proactive remediation is always less costly than reactive remediation in the context of a transaction.
Departing Employee Protocols
When an employee with inventive responsibilities departs, the offboarding process should include a reminder of the former employee’s continuing obligations under the PIIA, including the obligation to disclose and assign any inventions related to the company’s business that were conceived during employment, and to cooperate in patent prosecution. The departing employee’s signature on an exit acknowledgment confirming these continuing obligations reinforces the company’s position in any future dispute.
Conclusion
Invention assignments sit at the foundation of any technology-driven business’s intellectual property estate. Unlike the copyright context, where the law provides some automatic protections for employers through the work-made-for-hire doctrine, patent law places the initial rights squarely with the human inventor and demands a formal, written transfer to move those rights to the company. The legal framework is well established, but the operational challenge—ensuring that every employee and contractor signs an adequate agreement, that agreements comply with applicable state law, that patent applications reflect a clean chain of title, and that the company’s IP ownership position is documented and auditable—is one that many businesses, particularly at early stages, underestimate.
The cost of a well-drafted PIIA program is modest. The cost of discovering, years into a company’s development, that its core technology is not owned by the entity, or that a former contractor retains co-ownership rights, can be existential. We encourage businesses at every stage—from pre-incorporation startups to established enterprises—to review their invention assignment practices with qualified IP and employment counsel and to address any identified deficiencies promptly. The investment in getting this right from the beginning is among the most valuable any innovative company can make.
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This article is for general informational and educational purposes only.
It does not constitute legal advice and does not establish an attorney-client relationship.
Please consult qualified legal counsel regarding your specific circumstances.