Selling a patent is a defined process with a defined document at the end of it — a written assignment, recorded with the USPTO. Everything before that is finding someone who wants it and agreeing a price.
The hard part is reach, not law. A patent is personal property under 35 U.S.C. 261 and anyone can sell one, and there are patents for sale changing hands constantly. What most holders lack is any way to identify the handful of companies that would actually pay for it.
The process, step by step
1. Establish what it is worth
Do this before anything else. Approaching a buyer without a number means negotiating against someone who has one, and the first figure named tends to anchor everything that follows.
Value turns on four things: whether anyone is practising the claims, how much term remains, how broad and clear the claims are, and whether a specific buyer needs it. A patent that reads on a shipping product is a different asset from one that does not, even where the technology is identical.
Term remaining is priced directly. A buyer is purchasing a stream of exclusivity, and one with fifteen years to run is worth more than one with four — both for the protection and because the four-year patent may cost them the $8,280 third maintenance fee almost immediately.
A patent valuation sets your floor and tells you whether the sale is worth pursuing at all.
2. Identify buyers by relevance
Not by list. The question is which companies ship products that read on your claims, and which of those have shown they buy patents.
| Buyer type | Buys because | Reachable how |
|---|---|---|
| Operating companies | The patent covers something they make, or blocks them | Directly, via IP counsel |
| Non-practising entities | They can license or assert it | Through brokers, mostly |
| Defensive aggregators | It threatens their members | Membership channels |
| IP funds | Portfolio return | Broker networks |
Operating companies are the most reachable and often the best price, because a patent that reads on their own product is worth more to them than to anyone buying it speculatively.
How to find them. Read product literature and technical specifications in your field. Check who is filing patents in the same classification. Look at who has acquired patents in the space before — USPTO assignment records are public and searchable. This is research rather than a mailing list, and it is the part that determines whether the sale happens.
3. Prepare the diligence pack
Buyers who ask for these and wait three weeks lose interest. Have them ready before you make contact.
Chain of title. Every assignment from the inventor to you, recorded. Gaps are the single most common reason a patent deal stalls, and an unrecorded transfer somewhere in the history takes time to cure — sometimes requiring signatures from people who left the company years ago.
Maintenance fee status. Which fees have been paid and when the next falls due. A buyer inherits the obligation and prices accordingly.
Family members. Continuations, divisionals, foreign counterparts and their status. A buyer usually wants the family, not one member of it, and being told about a continuation late in diligence looks like concealment even when it is oversight.
Encumbrances. Prior licences, security interests, liens, any obligation that travels with the patent. An existing exclusive licence materially reduces what a buyer will pay, and must be disclosed.
Evidence of use, if you have it. A claim chart mapping your claims to a product in the market is the difference between asserting the patent is relevant and demonstrating it. It is also the single most persuasive document you can put in front of an operating company.
Co-owner consents. Every co-owner must join the assignment. Under US law each co-owner may independently license or practise the invention, but a sale of the whole patent requires all of them — and unresolved co-ownership is a common reason deals stall.
4. Approach
Directly if you can identify the right companies and reach their IP counsel. Cheapest, and often the best outcome for a patent with an obvious commercial home.
How to approach a large company. Most have a formal process for unsolicited IP submissions, partly to manage their own contamination risk. Find it before emailing. A submission arriving with a valuation, a claim chart and a clean chain of title is treated differently from one that arrives as a paragraph asking whether they are interested.
Through a broker if you cannot reach buyers yourself. Reported commissions run 25-35% and most brokers set minimum deal sizes that exclude single patents. Ask about the minimum before investing time in the conversation.
Never pay an upfront fee to a firm promising to market your invention. That is the invention-promotion model the FTC has repeatedly acted against, including a judgment exceeding $25 million against World Patent Marketing where the Commission found virtually all customers lost money. A legitimate broker earns on success.
5. Negotiate
Price is one term among several. The others that move the outcome:
A licence back. If you or your company still practise the invention, you need the right to continue after selling. Negotiate this before agreeing price, not after — it is much harder to introduce once a number has been settled.
Family treatment. Whether the sale includes continuations, divisionals and foreign counterparts, or only the one patent. Selling a family member in isolation reduces what the rest is worth.
Representations. Buyers will want you to warrant ownership, that the patent is unencumbered, and that you know of nothing invalidating. Warranting validity outright is a much heavier commitment and is usually resisted — you cannot guarantee a PTAB outcome.
Indemnity caps. If you give indemnities, cap them at the purchase price. Uncapped indemnity on a $40,000 sale is an open-ended liability.
Payment structure. Lump sum, staged, or partly contingent on the buyer successfully licensing or asserting. Contingent structures pay more nominally and frequently less actually, because you are then dependent on someone else's enforcement decisions.
6. Execute and record
The assignment is short — a written document transferring all right, title and interest, signed by the assignor.
Record it with the USPTO within three months of execution. Under 35 U.S.C. 261, recording within three months, or before a subsequent purchase, protects the buyer against a later bona fide purchaser. Recording is ministerial and does not validate the transfer, but failing to record creates a title gap that surfaces at the next sale rather than immediately.
Confirm the recordation posted. The assignment database updates on its own schedule, and a submitted assignment is not a recorded one.
The deadline that actually governs
A maintenance fee window is six months. A brokered sale takes six to eighteen months.
That mismatch is why so many saleable patents lapse. The owner receives a fee reminder, decides not to pay, and only then starts thinking about selling — by which point there is not enough runway.
| When you start | Realistic outcome |
|---|---|
| 12+ months before a fee | Full process, brokered or direct |
| At the reminder | Direct approach only, and tight |
| During the grace period | Unlikely, unless a buyer is already identified |
| After the grace period ends | Nothing to sell |
A patent sold before the window closes is worth something. The same patent a month after lapse is worth nothing. Both paths end your fee obligation; only one pays you.
58.6% of US utility patents granted in 2014 were abandoned before full term. Some were genuinely worthless. Many were simply never offered to anyone.
Selling versus licensing
| Sell | Licence | |
|---|---|---|
| Ownership | Transfers permanently | Stays with you |
| Payment | Once, at close | Recurring royalties |
| Maintenance fees | Buyer's problem | Still yours |
| Ongoing work | None after close | Managing the relationship |
| Requires | A buyer who wants it | A licensee already practising it |
| Tax treatment | Potentially capital gains | Generally ordinary income |
Licensing needs someone already using the invention. If nobody is, there is nobody to license to, and selling to a party who believes they can find those users is the realistic route.
A patent already under an exclusive licence is harder to sell and worth materially less, because the buyer acquires a right that somebody else is already exercising.
What buyers will find at diligence
Worth knowing in advance, because these are the things that kill deals late.
Title gaps. An assignment from a departed employee that was never recorded. An inventor who left before signing. A company reorganisation where the patent was never formally transferred.
Undisclosed licences. A licence granted years earlier and forgotten, or a non-exclusive licence buried in a settlement agreement.
Prior art the buyer finds. Diligence includes a validity review, and a buyer who finds strong prior art will either walk or reprice.
Fee status surprises. A missed fee currently within a grace period, or a patent already lapsed that the seller had not noticed.
Family fragmentation. Continuations owned by a different entity, or foreign counterparts already lapsed.
Find these yourself first. Everything on this list is discoverable by the seller in advance, and discovering it yourself costs a week while having the buyer discover it costs the deal.
Before you start
- Get a valuation. A number you can defend beats a number you hope for.
- Check and clean chain of title, recording anything unrecorded.
- Confirm the next maintenance fee date — it sets your real deadline.
- Identify who practises the claims, because that is who pays most.
- Resolve co-ownership before approaching anyone.
- Decide whether you need a licence back before negotiating.
- Assemble the diligence pack in advance of making contact.
- Take tax advice on the structure, because it affects net proceeds materially.
- Refuse upfront fees from anyone promising to market the invention.