Shop Rights in Patent Law

Shop rights are an employer's implied nonexclusive license to use an employee's patented invention — arising by operation of law based on equity and fairness: DEFINITION: when an employee invents something using the employer's time, resources, equipment, or facilities, the employer acquires a royalty-free, nonexclusive, non-transferable license to use the invention in its business; the employee retains ownership of the patent; LEGAL BASIS: shop rights are an implied license derived from equity — not from statute or an express agreement; they arise automatically when the circumstances justify them; LEADING CASE: United States v. Dubilier Condenser Corp. (S.Ct. 1933): established the modern shop rights doctrine; an employee who develops an invention on company time and with company resources may not exclude the employer from using it, even though the employee owns the patent; TRIGGERING CIRCUMSTANCES: courts look at the totality of the circumstances, including: (a) the employee used company time to develop the invention; (b) the employee used company equipment, facilities, or materials; (c) the employee used company employees (colleagues who assisted); (d) the invention was developed in connection with the employee's assigned work or job duties; NATURE OF SHOP RIGHTS: (a) NONEXCLUSIVE: the employer can use the invention, but the employee can also license it to others (including competitors); (b) ROYALTY-FREE: the employer pays no royalties; (c) NON-TRANSFERABLE: shop rights cannot be assigned or sublicensed by the employer; they are personal to the employer; (d) IRREVOCABLE: once established, shop rights cannot be revoked by the employee; COMPLETE DEFENSE: shop rights are a complete defense to patent infringement when an employee (or their assignee) sues the employer for using the patented invention.

Shop rights are fundamentally different from — and much weaker than — what employers obtain through invention assignment agreements: SHOP RIGHTS vs. ASSIGNMENT: shop rights: employee owns the patent; employer has nonexclusive, non-transferable license; employer cannot exclude competitors; assignment: employer owns the patent; employer can exclude anyone; employer can license, sell, and enforce the patent; INVENTION ASSIGNMENT AGREEMENTS: most employment contracts in technology-intensive companies include an invention assignment agreement (sometimes called a 'Proprietary Information and Invention Assignment Agreement' or PIIA); these agreements require employees to assign all inventions made: (a) during employment; (b) using company time, resources, or equipment; (c) in the company's field of business; SCOPE OF ASSIGNMENT OBLIGATIONS: 'hired to invent' doctrine: an employee hired specifically to invent (e.g., a research scientist) may be required to assign all inventions developed in the scope of employment, even absent an express agreement; STATE LAW LIMITATIONS ON ASSIGNMENT: California Labor Code § 2870 (and similar laws in Delaware, Illinois, Minnesota, North Carolina, Washington): invention assignment agreements cannot require assignment of inventions that: (a) involve NO company time, resources, or trade secrets; (b) do NOT relate to the employer's business or reasonably anticipated business; (c) do NOT result from any work performed for the employer; employees in these states can negotiate to retain personal inventions developed entirely outside work; WHY ASSIGNMENT BEATS SHOP RIGHTS: a patent assigned to the employer can be: (a) enforced against competitors; (b) licensed exclusively to others; (c) sold as an asset; (d) used in cross-licensing negotiations; shop rights provide none of these benefits — the employer can only use the invention internally.

Shop rights are narrower than what employers often assume — knowing the limits prevents over-reliance: LIMIT 1 — NON-TRANSFERABLE: the employer's shop right cannot be assigned to a third party or sublicensed; if the employer sells its business, the shop right does NOT transfer to the buyer absent specific agreement; this is a critical M&A due diligence issue — an acquirer may need to check whether key patent rights are genuine ownership interests or merely shop rights that won't transfer; LIMIT 2 — NONEXCLUSIVE: the employee can license the same invention to the employer's competitors; the employer cannot use shop rights to exclude others; LIMIT 3 — SCOPE OF THE BUSINESS: shop rights cover use of the invention in the employer's business as it existed when the shop right was established; they may not cover new business lines that the employer enters later; LIMIT 4 — PERSONAL TO THE EMPLOYER: shop rights are specific to the employer entity; they don't automatically flow through corporate reorganizations, mergers, or spin-offs; LIMIT 5 — FACTUAL DETERMINATION: whether shop rights exist is a fact-specific inquiry; an employee who developed an invention entirely on personal time, with personal equipment, unrelated to their job duties, has a strong argument against shop rights even if they were employed at the time; LIMIT 6 — JURISDICTION: shop rights doctrine is federal common law; state courts may apply varying standards; some states have specific statutes affecting employee invention rights; DEFENSIVE STRATEGY: inventors who want to preserve personal patent rights should: (a) use personal time and equipment exclusively; (b) keep detailed contemporaneous records showing personal time use; (c) review their employment agreement carefully; (d) consider written acknowledgment from employer that the invention is personal.

Well-drafted employment agreements provide clear rules on patent ownership rather than leaving the question to shop rights doctrine: INVENTION ASSIGNMENT CLAUSE: assigns all inventions made during employment in the company's field of business; should specifically include: patentable inventions; trade secrets; copyrightable works; specifications and protocols; design work; usually includes a trailing obligation (inventions made within 6-12 months after termination using company information); PRIOR INVENTIONS DISCLOSURE: employees are asked to list any inventions made prior to employment that they wish to retain; this establishes a clear baseline of what the employee owned before starting; prevents the employer from later claiming inventions that predate employment; CONFIDENTIAL INFORMATION CLAUSE: interacts with invention assignment; employee must keep company technology confidential; PROHIBITED ACTIVITIES: prohibits using company resources for personal patent development (clearly eliminates shop rights arguments); POST-EMPLOYMENT RESTRICTIONS: non-compete (limited in many states) and non-solicitation provisions; NOTICE REQUIREMENTS: employees must promptly disclose to the employer all inventions made during employment that might fall under the assignment obligation; allows the employer to evaluate and decide whether to pursue patent protection; EMPLOYER'S ELECTION RIGHT: the employer has a defined period (often 90 days) to elect whether to pursue patent protection for a disclosed invention; if the employer elects not to proceed, the employee is typically free to pursue the patent personally; CONSULTANT/CONTRACTOR AGREEMENTS: independent contractors don't automatically assign inventions to clients; contracts with consultants should explicitly include work-for-hire language (for copyrights) and invention assignment provisions (for patents).

The treatment of shop rights in M&A transactions requires careful analysis — they are commonly overlooked until after the deal closes: THE NON-TRANSFER PROBLEM: shop rights are personal to the employer entity that earned them; they are not transferable without consent; this creates a problem in M&A: an acquirer of the employer cannot automatically rely on the shop rights that the target employer had; the target's shop rights may not flow to the acquirer; DUE DILIGENCE IMPLICATIONS: in M&A due diligence, IP counsel must identify: (a) inventions that the company uses but does not own (it has only shop rights, not title); (b) inventions where the company relies on shop rights rather than an express assignment; (c) the risk that the employee-inventor may assign the patent to a third party, who then asserts it against the acquirer (who has no shop rights); EXAMPLE SCENARIO: Target Company uses a patented manufacturing process developed by a former employee; Target never obtained an assignment; Target has shop rights; Acquirer buys Target; the former employee assigns the patent to an NPE; the NPE sues Acquirer; Acquirer argues it inherited Target's shop rights — but courts have held that shop rights are not automatically transferred in asset sales; the NPE may succeed in obtaining a royalty; REMEDY: in M&A, identify all inventions with shop rights status and: (a) obtain assignments from inventor employees/former employees before close; (b) include representations and warranties about patent ownership in the purchase agreement; (c) obtain indemnification from the seller for shop rights risks; (d) license or purchase the patents at issue; CORPORATE RESTRUCTURING: shop rights similarly may not transfer in spin-offs, mergers by acquisition, or divisional reorganizations without careful structuring.