IP Assignment Clause Explained: What You're Actually Signing Away

An intellectual property (IP) assignment clause is the provision in your offer letter or a companion agreement that transfers ownership of inventions, code, designs, and other work product you create to your employer. In most states it only reaches work made on company time, with company resources, or related to the employer's business — not everything you touch while employed there. The scope, and what it can legally cover, depends on which state's law applies and how the clause itself is written.

What Is an IP Assignment Clause?

An IP assignment clause requires you to transfer ownership of qualifying inventions and creative work to your employer, either automatically as you create them or through a signed assignment. It's less a single clause than a small legal system: definitions, disclosure duties, and an assignment obligation, usually bundled with confidentiality terms into one document.

What It Typically Assigns

The clause usually covers inventions, discoveries, code, designs, written material, and other IP you create "in the course of employment" or using the employer's equipment, time, or trade secrets. It also typically requires you to disclose new inventions promptly and to cooperate with paperwork the employer needs to secure a patent or copyright later, even after you've left.

The PIIA Bundle

Most companies don't send a standalone IP clause. They send a Proprietary Information and Inventions Assignment Agreement (PIIA), which folds confidentiality obligations, the IP assignment, and sometimes a narrow non-solicitation term into one document, often referenced in the offer letter rather than reproduced in it. If your offer letter says "subject to our standard PIIA," ask to see that document before you sign.

What Falls Inside the Assignment — and What Doesn't

The assignment generally reaches work connected to your job or made with company resources; it doesn't reach the general knowledge and skills you'd take to any employer, or, depending on your state, work you made entirely on your own time and dime.

Work Related to the Employer's Business or Made With Company Resources

If you build something using company equipment, on company time, or that overlaps with the employer's actual or "demonstrably anticipated" research and development, it's assignable — even if you worked on it at home in the evening. Courts and state statutes both use this business-relatedness test, not just a clock-in/clock-out test.

General Skills and Knowledge You Keep

You keep the general skills, techniques, and know-how you develop on the job. A PIIA can't claim ownership of your growth as an engineer or designer — only of the specific inventions and works you produce. This distinction matters if you're comparing offers; see our guide on how to compare two job offers for the other clauses worth weighing at the same time.

The Prior Inventions Exhibit Is the Line Most People Skip

Nearly every PIIA includes a "Prior Inventions" or "Prior Inventions Exhibit" schedule where you list IP you already own before signing, and anything you list there is excluded from the assignment going forward.

Why a Blank Schedule Works Against You

Leaving the schedule blank doesn't protect you — it does the opposite. Many agreements state that anything not disclosed may later be treated as company property if it becomes relevant to the business. A side project, an open-source library, or an app you've been building on nights and weekends should go on this list before you sign, not after a dispute starts.

What to List and How Much Detail to Include

List the name, approximate date, and a brief description of each project — enough to identify it and put the employer on notice, not a full technical writeup. You don't need to disclose implementation details or trade secrets of your own; the point is proving the work predates the agreement.

State Laws Cap How Far the Clause Can Reach

A handful of states have statutes that void any part of an IP assignment clause that reaches beyond work related to the employer's business or made with its resources, no matter how broadly the agreement itself is written.

California Labor Code Section 2870

California's Labor Code § 2870 is the model most other states copied. It says an assignment clause does not apply to an invention you developed entirely on your own time, without the employer's equipment, supplies, facilities, or trade secret information — unless that invention relates to the employer's business or actual/anticipated R&D, or resulted from work you did for the employer. Any clause that tries to claim more than that is unenforceable as a matter of public policy.

Other States With Similar Protections

Delaware, Illinois, Kansas, Minnesota, North Carolina, Utah, Washington, and New Jersey have enacted statutes with substantially the same carve-out, and New York added its own version — Labor Law § 203-f — in September 2023, per Wilson Sonsini's client alert. Outside these states, many employers still mirror the California language voluntarily since it's the industry-standard PIIA template, but read your specific agreement rather than assume a statute backs you up.

Why the Clause Exists: Patents vs. Copyrights

Companies write IP assignment clauses because ownership doesn't transfer the same way for every kind of work you create, and leaving it to default rules produces gaps employers don't want to risk.

Copyright Transfers Automatically Under Work Made for Hire

For copyrightable work — code, documentation, designs — created within the scope of your job, the "work made for hire" doctrine already makes the employer the legal author automatically, no signature required. This is a different legal mechanism from IP assignment, even though offer letters often bundle language for both.

Patents Require a Signed Assignment — or a "Shop Right"

Patent ownership doesn't transfer automatically, even when your employment agreement says it should. An actual signed assignment is required, typically recorded with the USPTO. Without one, an employer who let you invent on company time and resources may still get an implied, non-exclusive "shop right" to use the invention — but not ownership of the patent itself. That gap is the practical reason PIIAs exist: employers want clean ownership, not just a usage right.

Red Flags Before You Sign

A well-drafted IP clause tracks the business-related, company-resources test above. A poorly drafted one tries to claim more than the law allows and hopes you don't push back.

Overbroad "Anything, Anytime" Language

Watch for language claiming ownership of anything you create "during your employment" with no tie to company time, resources, or business relatedness. In states with a 2870-style statute, that overreach is unenforceable — but you'd rather not have to litigate it to find out.

No Prior Inventions Exhibit Attached

If the PIIA references a prior inventions schedule but none is attached, or you're asked to sign without one, that's a gap worth flagging before signing — not after you've shipped a side project you wanted to keep. Offer XRay checks for this kind of missing exhibit and other vague IP language automatically when you upload an offer letter or PIIA.

No Carve-Out for Unrelated Personal Projects

Some companies will add an explicit carve-out for personal projects unrelated to the business, especially for senior or specialized hires. It's not standard, but it's a reasonable ask if you have ongoing outside work you want protected beyond the statutory minimum.

Frequently Asked Questions

Does an IP assignment clause cover things I made before I was hired?

No, as long as you disclose them on the prior inventions exhibit. Anything properly listed there is excluded from the assignment and stays yours; anything you fail to disclose is at risk of being treated as company property later.

Can my employer claim a side project I build on my own time?

Only if it uses company equipment or resources, or relates to the employer's business or anticipated research — in states with a 2870-style statute. Outside those states, read your specific agreement, since the default protection may be narrower or absent.

Is a PIIA the same thing as a non-compete?

No. A PIIA governs who owns IP you create and how you handle confidential information; a non-compete restricts where you can work afterward. They're often signed together but are legally distinct — see our breakdown of the non-compete agreement for that separate clause.

What happens if I never sign a prior inventions exhibit?

Practices vary, but many PIIAs treat an unsigned or blank exhibit as disclosing nothing, which puts undisclosed prior work at greater risk if a dispute arises later. Submitting a completed list, even a short one, is safer than leaving it blank.

Key Takeaways

• An IP assignment clause transfers ownership of inventions and creative work tied to your job or made with company resources — not everything you create while employed.
• List every side project, app, or prior work on the prior inventions exhibit before you sign; a blank schedule can be read against you later.
• California and several other states (Delaware, Illinois, Kansas, Minnesota, North Carolina, New Jersey, New York, Utah, Washington) cap how far an assignment clause can legally reach.
• Patents require a signed assignment to transfer; copyright already vests in the employer automatically under work-made-for-hire, which is why offer letters bundle both into one PIIA.
• Tools like Offer XRay flag missing prior inventions exhibits and overbroad IP language automatically, and pricing starts at $4.99 for two analysis credits.

The IP assignment clause rarely gets the same scrutiny as salary or equity, but it's the one clause that can reach into work you do outside your job entirely if it's written too broadly or you sign a blank exhibit. Read the prior inventions schedule as carefully as the comp table, and if you'd rather have the whole document checked at once, see our full offer letter checklist or try Offer XRay on your document.