A patent holder is whoever owns the patent today. Not necessarily the inventor, and not necessarily the company named on the front page.
What they hold is narrower than most people assume. A patent is a right to exclude others. It is not permission to practise the invention.
And it comes with obligations attached — maintenance fees, enforcement, and the cost of defending validity if someone challenges it. Ownership of a patent is a position with running costs.
Holder, inventor, assignee, licensee
Four roles, routinely conflated.
| Role | What it means | Can it change? |
|---|---|---|
| Inventor | Conceived at least one claim | No — a question of fact |
| Assignee | Took ownership by assignment | Yes, with each transfer |
| Holder / owner | Owns it now | Yes |
| Licensee | Has permission to use it | Yes |
Inventorship is fixed and factual. An inventor is whoever contributed to conception of at least one claim. It cannot be agreed, granted or transferred — only corrected if wrong. See inventorship.
Ownership is contractual and mobile. Most patents are assigned to employers under employment agreements, so the inventor is named forever and owns nothing.
The front page assignee is a snapshot at grant. It does not update. A patent granted to a company that sold its portfolio five years ago still shows the original assignee.
What the holder can do
| Right | Detail |
|---|---|
| Exclude | Stop others making, using, offering to sell, selling or importing |
| Sue | Bring infringement proceedings for damages and injunctive relief |
| License | Exclusive, sole or non-exclusive; by field and territory |
| Sell | Patents are personal property under 35 U.S.C. 261 |
| Use defensively | Counterclaim, cross-licence, deterrence |
| Abandon | Stop paying fees and let it lapse |
Damages are at minimum a reasonable royalty under 35 U.S.C. 284, trebled where infringement is willful. Lost profits are available where the holder can prove they would have made the sales.
Marking matters for damages. A holder who practises the invention and does not mark products with the patent number generally cannot recover damages for the period before actual notice was given.
What the holder cannot do
Practise the invention, necessarily. This is the single most misunderstood point about patent ownership.
| Patentability | Freedom to operate | |
|---|---|---|
| Asks | Can I patent this? | Can I sell this? |
| Considers | All prior art, including expired | In-force claims only |
| Possible answer | Own a patent you cannot practise | Practise freely with no patent |
An improvement patent is the classic case. You invent a better version of someone else's patented device. Your improvement is patentable. Building it infringes their claim. You hold a patent on something you are not permitted to make.
Which is exactly the situation cross-licences exist to resolve. See freedom to operate.
What the holder owes
Maintenance fees are the obligation that ends most patents.
| Fee | Due after grant | Large | Small (40%) | Micro (20%) |
|---|---|---|---|---|
| First | 3.5 years | $2,150 | $860 | $430 |
| Second | 7.5 years | $4,040 | $1,616 | $808 |
| Third | 11.5 years | $8,280 | $3,312 | $1,656 |
| Total | $14,470 | $5,788 | $2,894 |
Nobody sends a reminder that matters. Miss the end of the six-month grace period and the patent expires permanently.
Entity status must be true when paid. A company that outgrows small entity thresholds and keeps claiming the discount has a problem, not a saving.
Enforcement is entirely the holder's job. No public authority polices patent infringement. If a competitor infringes and the holder does nothing, nothing happens.
Validity defence is also the holder's cost. An IPR petition or district court invalidity defence has to be funded by the owner, and institution decisions at the PTAB have been volatile — roughly 65% in October 2024, falling to around 37% by February 2026.
Co-ownership is harder than it looks
Each co-owner holds an undivided interest in the whole patent, not a share of it. Under US law that produces consequences most co-owners do not expect.
| Any co-owner may | Without |
|---|---|
| Practise the invention | The others' consent |
| Grant a non-exclusive licence | The others' consent |
| Keep all the proceeds | Accounting to the others |
| Sell their own interest | The others' consent |
| All co-owners must join to | Effect |
|---|---|
| Sue for infringement | One holdout blocks enforcement entirely |
| Grant a genuinely exclusive licence | Any co-owner can undercut it |
| Sell the whole patent cleanly | Buyers require every interest |
One co-owner can destroy the value of an exclusive deal by licensing non-exclusively to the other side, keeping the money, and owing nobody an explanation.
And a single uncooperative co-owner can prevent enforcement altogether, because all co-owners generally must join an infringement suit.
The fix is a written agreement at the outset. Co-ownership arising by default — joint inventors at different companies, university collaborations — is where this bites, and it is far cheaper to address before grant than after.
Finding the current holder
| Step | Source | What it gives |
|---|---|---|
| 1 | Front page assignee | Ownership at grant only |
| 2 | USPTO Assignment Search | Recorded transfers since |
| 3 | Maintenance fee payer | Who is actually paying — a strong signal |
| 4 | Corporate records | Mergers, name changes, dissolutions |
| 5 | Litigation dockets | Who has asserted it |
Recording is not mandatory, which is why the assignment record can be incomplete. An unrecorded assignment is still valid between the parties.
But recording within three months protects against a later good-faith purchaser. An assignment recorded late can lose priority to one recorded promptly, which is why the three-month rule matters at closing.
Corporate history breaks more chains than anything else. Acquisitions, name changes and dissolutions leave patents recorded to entities that no longer exist, and reconstructing the path takes weeks.
Worked example: a broken chain
A buyer runs diligence on a patent offered at $180,000.
| Finding | Status |
|---|---|
| Front page assignee | TechCo Inc. |
| Assignment record | TechCo Inc. → nothing further |
| Corporate search | TechCo dissolved 2019; assets to Meridian Holdings |
| Meridian → seller assignment | Recorded, 2021 |
| Gap | TechCo → Meridian never recorded |
| Inventor assignments | Two of three recorded; third inventor never assigned |
Two defects, different severity.
| Defect | Fix | Difficulty |
|---|---|---|
| Unrecorded TechCo → Meridian transfer | Locate the acquisition documents and record | Weeks, usually possible |
| Third inventor never assigned | Obtain an assignment from them now | Depends entirely on that person |
The third inventor is the real problem. They may be a co-owner. If so, they can license the patent non-exclusively to anyone, keep the money, and refuse to join an infringement suit — which would make the patent close to unenforceable for the buyer.
The deal stalls until it is resolved. This is not unusual: incomplete inventor assignments are among the most common findings in patent diligence, and they surface years after anyone remembers the circumstances.
Cost of finding this before closing: a few hours. Cost of finding it after: the purchase price.
The decision every holder eventually faces
Three maintenance fee windows, three chances to decide.
| Ipiry Patent Survival Curve v1.0 | Rate |
|---|---|
| Survive the 3.5-year fee (2022 cohort) | 85.8% |
| Survive the 7.5-year fee (2018 cohort) | 64.6% |
| Reach full term (2014 cohort) | 41.4% |
| Abandoned before full term | 58.6% |
Computed from 27,273,654 USPTO maintenance fee records covering 8,262,336 US utility patents. See the patent survival curve.
Most holders let most patents go, and that is a rational outcome rather than a failure. The failure is letting them go by default rather than by decision.
A patent sold before a fee deadline is worth something. The same patent a month after the grace period closes is worth nothing, and both paths end the fee obligation. See how to sell my patent.
Recording an assignment
Recording is not required for an assignment to be valid, but not recording creates a specific risk.
| Unrecorded | Recorded within 3 months | |
|---|---|---|
| Valid between the parties | Yes | Yes |
| Protected against a later good-faith purchaser | No | Yes |
| Visible in diligence | No | Yes |
| Provable years later | Depends on the parties' records | Public record |
35 U.S.C. 261 sets the rule. An assignment is void against a subsequent purchaser for valuable consideration without notice, unless recorded within three months of the assignment or before the subsequent purchase.
Which means an unrecorded assignment can be defeated by a later one. A seller who assigns to two parties leaves the first buyer exposed if they never recorded.
Recording is cheap and fast. It is done through USPTO Assignment Center, and the cost is trivial against the risk of an unprovable chain of title a decade later when the patent is finally worth something.
Record every link, not just the last one. A chain with one recorded transfer and three unrecorded ones is still a broken chain.
Employment agreements decide most ownership
The majority of US patents are held by employers, not inventors, and the mechanism is contractual rather than automatic.
There is no default rule that an employer owns an employee's invention. Absent an agreement, the inventor owns it — subject to a shop right, which gives an employer a non-exclusive, non-transferable right to use an invention developed on company time with company resources.
| Situation | Who owns it |
|---|---|
| Written assignment agreement | Employer |
| Employed to invent, no agreement | Employer, by implication |
| General employment, company resources used | Inventor owns; employer gets a shop right |
| Wholly independent, own time and resources | Inventor |
| Contractor with no IP clause | The contractor, commonly a surprise |
Contractor arrangements are the most frequent source of ownership disputes. An engineering firm hired to develop a product owns what it invents unless the contract says otherwise, and "work made for hire" language borrowed from copyright does not transfer patent rights.
Several states limit how far assignment agreements can reach. California, Washington, Minnesota and others restrict clauses covering inventions made entirely on the employee's own time without employer resources and outside the employer's business. An overbroad clause may be unenforceable in those states.
Assignments must be executed, not just promised. An agreement to assign in future can leave title unsettled until a document is actually signed, which is exactly the defect that surfaces years later in diligence.
Patent holder: the checklist
- Confirm who the holder actually is. The front page shows ownership at grant, not today.
- Trace every assignment from each named inventor to the current owner in USPTO Assignment Search.
- Check every inventor assigned. A single unassigned inventor may be a co-owner with the power to license around you and block enforcement.
- Record assignments within three months to preserve priority against later purchasers.
- Put a co-ownership agreement in place before grant if the patent has joint owners at different organisations.
- Separate patentability from freedom to operate. Holding a patent does not mean you may practise the invention.
- Mark products with the patent number if you practise the invention, or lose damages for the period before actual notice.
- Verify entity status is still accurate each time a maintenance fee is paid.
- Diarise all three fee windows at least three months before each grace period closes.
- Decide at each window — keep, sell or lapse. All three are legitimate, but only two remain available if you wait until after the deadline.