How Selling a Patent Works: Assignment to Recordal

Ask how selling a patent works and you get a sales funnel: value it, list it, find a buyer, sign something. The transfer itself, the part that decides whether you are actually paid and whether the buyer actually owns anything, gets a closing paragraph.

That is backwards. Agreeing a price is the visible half of a patent sale. The closing checklist is the half that goes wrong, and it goes wrong in a small number of repeatable ways: a co-inventor who never signed, a condition the patent office refuses to police, a registration clock that expired while everyone was celebrating.

Here is the transaction in the order a closing checklist runs it.

What actually changes hands

A patent is property. Patents have the attributes of personal property and are assignable in law by an instrument in writing, which is the whole legal basis of a sale, and it also sets the two conditions that trip people up. Writing, and signature. There is no oral patent sale.

What you are transferring is the right to exclude other people from practising the claims. A sale transfers all rights and responsibilities to the new owner, while licensing grants permission to use the patent and leaves ownership where it is. After a full assignment you are not a reduced owner. You are not an owner.

Step one: prove you own it before you try to sell it

This is where more deals stall than at price.

Ownership traces back to inventorship, and every document downstream inherits whatever defect sits at the start. If the wrong inventor was named, or a co-inventor was omitted, every subsequent transfer document may be built on a flawed foundation. A buyer's counsel will find this in an afternoon. Find it first.

Two traps account for most of it.

Joint ownership. Under US law each co-owner may make, use and sell the invention independently, without consent and without accounting to the others. That sounds permissive until you try to sell. No single joint owner can assign the whole patent or grant a full exclusive licence alone, so every co-owner has to sign the assignment for full title to move.

Employment agreements. Many inventors do not own the rights they are negotiating over, because an employment agreement already assigned them automatically. Verify the legal owner of record rather than the name printed on the front page.

Before you go to market, also confirm the housekeeping: that maintenance fees are paid and that you are listed as the owner on all relevant documents.

Step two: build the package their diligence will ask for

A buyer's diligence list is predictable, which means you can answer it before it is sent. A complete package should carry the patent family listing with numbers, filing dates, issue dates, expiration dates and jurisdictions, clean chain of title documentation from inventors through to the current owner, a plain language summary of the key claims, prosecution history highlights including significant claim amendments, the maintenance fee payment history, a summary of commercial products that appear to practise the claims, any existing licences, covenants or encumbrances, and litigation history including pending challenges.

Every gap you leave is a discount the buyer applies on your behalf, because unresolved risk gets priced conservatively by the person who did not create it.

Step three: approach buyers without giving the asset away

Sellers routinely over-protect the wrong thing. The published patent application is already public record, so what the invention does and how to make it is already out there; the case for an NDA is the material around it rather than the invention itself. Claim charts, commercial data, unfiled continuations and your price floor are the confidential assets in this conversation.

Step four: the terms that decide the real price

The headline number is not the deal. These clauses are.

Payment structure. Upfront lump sum, instalments, or a combination, with any conditions precedent spelled out.

Representations and warranties. Assurances to the buyer about ownership, validity and freedom from encumbrances, backed by indemnification clauses that allocate liability for past and future issues. This is the clause where a seller quietly takes on risk long after the money is spent, so read what you are warranting and for how long.

Scope. Continuations and divisionals need to be named explicitly, and a covenant not to sue should protect the seller from future assertion of the assigned patents against its own existing products; any pending inter partes review or litigation involving the patents needs its own treatment. Selling a patent that reads on something you still ship, without that covenant, means buying a lawsuit against yourself.

The transfer document also carries plumbing that is easy to skip and expensive to omit: the scope of rights transferred as full or partial, the transfer effective date, whether future improvements are included, and the dispute resolution route, with conflicts with previous licensing agreements and tax valuation among the named risks of getting it wrong.

Step five: signing the assignment

The instrument itself is short and unforgiving. It must identify the patent by number, title and inventors, and be signed by the assignor, which for a jointly owned patent means every co-owner.

Nothing here is curable by intent. A handshake, an email chain and a wire transfer do not move title.

Step six: why the money moves through escrow

This is the part almost nobody explains, and it is the strongest structural argument in the whole process.

The instinct is to write the assignment so title passes on payment. It does not work the way sellers expect, because an assignment made conditional on the performance of an act such as the payment of money is regarded by the Office as an absolute assignment once recorded, and the Office does not determine whether such conditions have been fulfilled. Submitting a conditional assignment for recordation is treated as signifying that the condition already happened. The register will not hold your money for you.

So the sequencing has to be done outside the patent office. In practice that is escrow: the buyer's payment is held until the assignment is executed, so the seller receives funds only when the assignment is complete. One neutral holder, two conditions, no reliance on a clause the registrar will ignore.

Step seven: recordal, and the three month clock

Recording is not what makes the transfer valid between you and the buyer. It is what makes it survive contact with a third party.

The statute is precise: an assignment is void against any subsequent purchaser or mortgagee for valuable consideration, without notice, unless it is recorded within three months from its date or before that later purchase. In plain terms, an assignment that is not timely recorded will not be superior to the rights acquired by a bona fide purchaser for valuable consideration who did not know about it. Sell the same patent twice, deliberately or through a paperwork error, and the diligent recorder wins.

What the office wants. Each document submitted for recording needs a single cover sheet, and a fee is due for each application or patent the document is recorded against; documents go in electronically through the Office's electronic patent assignment system, and anything found not recordable comes back with a Notice of Non-Recordation. Cost is modest: recording an assignment with the USPTO costs 40 dollars per patent electronically, and the recording should be done within three months to protect against subsequent purchasers and establish lien priority. Budget time rather than money, since recordation typically takes three to eight weeks.

What recordal does not do. It does not bless the deal. Recording is a ministerial act, not an Office determination of the validity of the assignment document or of its effect on ownership. A recorded assignment with a missing co-owner signature is a recorded defect.

If the patent is European, the last step is a different step

Almost every page answering this question is written for a US patent, which quietly misleads anyone holding a European family. The mechanics diverge exactly at recordal.

At the European Patent Office a transfer is entered in the European Patent Register on request under Rule 22 EPC, on evidence, and no fee is due where the request is filed via MyEPO Portfolio while a fee remains due by other means, with the request not deemed filed until it is paid; the transfer is registered with the date on which the request, the evidence or the fee is received, whichever is latest. That date matters, because effect runs from registration rather than from signature.

Then the timing rule with no US equivalent. After grant, transfers can only be registered in the European Patent Register during the opposition period or during pending opposition proceedings under Rule 85 EPC, and after that registration of changes is a matter for the national offices of the designated contracting states. During the international phase of a PCT application, recordal is requested from WIPO instead.

For a seller with a transatlantic family that means one signature and three separate registration jobs, on three different clocks, at three different registries. Closing the US side and assuming Europe followed is how a German or EU proprietor discovers years later that the register still names the seller.

The step the process charts leave out

Everything above is procedure, and procedure is the tractable part. Finding a buyer is not.

More than 90 percent of properties find buyers in the real estate secondary market, and more than 90 percent of patents do not transact at all. The reason is not a broken process. An uninfringed patent has little or no value until the industry catches up with the invention, because there is no exclusion value to buy, and the same source notes that studies indicate more than half of the patents in circulation would be invalidated if challenged. Buyers price both facts.

So run the closing checklist, and run the honest one first. It is worth being clear about which route actually suits what you are holding, about what patents actually sell for, and about what a broker's commission buys before any of the seven steps begin.

How we run the same seven steps

We treat brokerage as an M&A process rather than a listing, so it is fair to state our own economics plainly. Commission is paid by the seller on completion, with a minimum fee of EUR 5,000 per completed transaction, and no sale means no fee. An optional retainer is credited on close.

The work that changes outcomes happens before step three. Every asset goes through a validation gate first: physics-grade claim reconstruction, detectability analysis and validity probability, benchmarked at 0.76 percent mean absolute percentage error against real-world outcomes. Detectability is the underrated one. A claim you cannot show is being practised is a claim a buyer will not pay for, and finding that out before outreach is cheaper than finding it out during.

Two limits stated in the same breath. EX-IX is not a firm of patent attorneys, and a novelty search does not guarantee grant or patentability; attorney work runs through an independent licensed attorney of record. And no intermediary, us included, can promise a buyer.

FAQ

Do I need a lawyer to sell a patent? Not to find a buyer or agree a price. You do need one on the paperwork. A registered patent attorney or agent should review the assignment agreement before signing, because the writing and signature requirements are statutory and a defective instrument is not something you can fix afterwards by explaining what you meant.

What happens if I never record the assignment? The transfer stays valid between you and the buyer. It becomes vulnerable to a third party: an unrecorded assignment is void against a later purchaser or mortgagee who paid value without notice of it, unless recorded within three months of its date or before that later purchase. The risk is small until the day it is total.

How long does the transfer take once both sides have signed? Money can move in days if escrow is already open. Public ownership lags: US recordation is measured in weeks, and until it completes the register still names the seller. Plan any announcement or downstream deal around the register, not the signature.

Can I sell an application that has not granted yet? Yes. Applications are assignable in the same way as granted patents, and buyers discount for examination risk, commonly paying substantially less than for an equivalent granted patent. A provisional carries a hard twelve month deadline the buyer must meet or the rights lapse, which is worth making explicit in the agreement. The pricing consequences are their own subject, covered in selling while the application is still pending.

Do licences I already granted survive the sale? Existing licences, covenants and encumbrances are diligence items that travel with the asset, and conflicts with previous licensing agreements are a named risk of a poorly documented transfer. Disclose them at the package stage. A licence discovered late does not just reprice the deal, it costs you the buyer's trust in everything else you disclosed.