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Patent Maintenance Fees: Keeping Your Patent Alive

April 26, 2026 Aruna 11 min read
patent maintenance fees schedule and USPTO payment windows

Patent maintenance fees are the most common way a valuable U.S. patent dies. Not litigation, not invalidation – a missed date. This guide covers the statutory schedule under 35 U.S.C. 41(b), the surcharge window, what reinstatement under 37 CFR 1.378 actually requires, and the intervening rights a competitor acquires while your patent sits expired.

An issued U.S. utility patent does not automatically remain in force for its full 20-year term. To maintain patent protection, patent holders must pay periodic maintenance fees to the USPTO at specific intervals. Missing a maintenance fee payment can cause your patent to expire prematurely — a potentially catastrophic loss of intellectual property value. At PerspireIP, we help clients manage patent maintenance fee obligations as part of comprehensive portfolio management. This guide explains everything you need to know about patent maintenance fees.

What Are Patent Maintenance Fees?

Patent maintenance fees are periodic fees that must be paid to the USPTO to keep a utility patent in force beyond certain anniversaries of its grant date. They are required for U.S. utility patents only — design patents and plant patents do not require maintenance fees. The requirement to pay maintenance fees was introduced to ensure that patent holders actively maintain their patent protection and to generate revenue that helps fund the USPTO’s operations.

Failure to pay a maintenance fee on time — without subsequently obtaining reinstatement — results in the patent expiring before the end of its 20-year term. Once expired, the patent enters the public domain and can no longer be enforced against infringers.

Patent Maintenance Fee Schedule and Amounts

U.S. utility patent maintenance fees are due at three intervals after the patent grant date:

  • 3.5-year maintenance fee: due between 3 years and 3.5 years after the grant date. Current amounts: approximately $2,000 for large entities, $800 for small entities, and $400 for micro entities.
  • 7.5-year maintenance fee: due between 7 years and 7.5 years after the grant date. Current amounts: approximately $3,760 for large entities, $1,500 for small entities, and $750 for micro entities.
  • 11.5-year maintenance fee: due between 11 years and 11.5 years after the grant date. Current amounts: approximately $7,700 for large entities, $3,080 for small entities, and $1,540 for micro entities.

Fees increase substantially at each stage, reflecting the increasing value of older patents that have survived the market test. Note that these amounts are current as of 2024 and the USPTO adjusts maintenance fees periodically — always verify current fees with the USPTO fee schedule before making payments.

The 6-Month Grace Period

Two distinct six-month periods apply to each maintenance fee, and confusing them is the most common way a patent is lost. Under 35 U.S.C. 41(b) the fees fall due at 3.5, 7.5 and 11.5 years from grant. The fee may be paid without surcharge during the six months ending on that due date — that is, from 3 to 3.5 years, 7 to 7.5 years and 11 to 11.5 years.

Missing the due date does not immediately end the patent. A further six-month grace period runs from the due date (to 4, 8 and 12 years respectively), during which the fee may still be paid together with the surcharge set out in 37 CFR 1.20(h). Only if the fee is unpaid at the end of that grace period does the patent expire, after which reinstatement requires a petition under 37 CFR 1.378.

What Happens If You Miss a Maintenance Fee?

If you miss a maintenance fee payment deadline (the 3.5, 7.5, or 11.5-year anniversary), your patent will expire. However, there is an opportunity to revive the patent through petition within a limited time after expiration. You can petition for revival on the ground that the failure to pay was unintentional, paying the overdue maintenance fee together with the petition fee. Note that 37 CFR 1.378 sets no fixed outer time limit for an unintentional-delay petition — but the Director may require additional information where there is a question whether the delay was in fact unintentional, and the longer the lapse, the more likely that inquiry becomes.

The revival process is not guaranteed, and it is far better to pay fees on time than to rely on the revival process.

Who Is Responsible for Paying Maintenance Fees?

The patent owner (which may be the inventor or an assignee company) is responsible for paying patent maintenance fees. The USPTO does not send invoices or reminders — it is entirely the patent owner’s responsibility to track and pay maintenance fees on time. This is one of the primary reasons that companies with large patent portfolios retain professional patent management services. A missed maintenance fee on a commercially important patent can result in millions of dollars in lost protection.

Entity Status and Maintenance Fee Savings

Small entities — independent inventors, small businesses (fewer than 500 employees), and nonprofit organizations — pay reduced patent maintenance fees, typically 40% of the large entity rate. Micro entities — those who qualify under income limits and meet certain filing criteria — pay even further reduced fees, typically 20% of the large entity rate. It is important to verify your entity status before each maintenance fee payment, as entity status can change if a company grows beyond the small entity threshold, licenses to large entities, or otherwise changes its qualifying status.

Strategic Portfolio Management: Which Patents to Maintain

For organizations with large patent portfolios, deciding which patents to maintain and which to allow to expire through non-payment of maintenance fees is a critical portfolio management decision. Maintaining every patent in a large portfolio can cost millions of dollars annually in maintenance fees alone. A systematic portfolio review process considers whether each patent still covers products or processes currently in use or planned for future use, whether the patent has licensing value or is being licensed, whether competitor products appear to infringe the patent and enforcement may be contemplated, and whether the patent provides blocking value against competitors entering your space.

Maintenance Fees for Foreign Patents

In addition to U.S. patent maintenance fees, patents granted in foreign countries also require periodic maintenance fee payments — called renewal fees or annuities in most foreign jurisdictions. Unlike U.S. maintenance fees, most foreign patent offices require annual renewal fee payments beginning shortly after filing. Managing renewal fees across a global patent portfolio requires specialized docketing systems and local agent networks. PerspireIP works with a global network of patent agents to ensure timely payment of patent annuities in all jurisdictions where our clients hold patent protection.

How PerspireIP Manages Patent Maintenance Fees

At PerspireIP, we maintain comprehensive docketing systems that track maintenance fee deadlines for all client patents. We send advance notices of upcoming maintenance fee deadlines, facilitate maintenance fee payments efficiently and accurately, advise clients on portfolio pruning decisions, and manage both U.S. maintenance fees and foreign patent renewal fee obligations. Our goal is to ensure that no client ever loses patent protection due to a missed maintenance fee.

Reinstating an Expired Patent Under 37 CFR 1.378

A patent that expires for non-payment is not necessarily gone. 35 U.S.C. 41(c)(1) gives the Director discretion to accept a late maintenance fee after the six-month grace period has run, where the delay is shown to the satisfaction of the Director to have been unintentional. The mechanism is a petition under 37 CFR 1.378.

The petition itself is short. Under 37 CFR 1.378(b) it must contain three things: the required maintenance fee set out in 37 CFR 1.20(e) through (g); the petition fee set out in 37 CFR 1.17(m); and a statement that the delay in payment of the maintenance fee was unintentional. There is no requirement to explain the circumstances in the petition as filed.

That last point is where practitioners get comfortable and should not. 37 CFR 1.378(b)(3) reserves to the Director the right to require additional information where there is a question whether the delay was unintentional. A bare statement is sufficient to file; it is not a guarantee of acceptance. Where a long period has elapsed, or where the record suggests the owner made a deliberate decision to let the patent lapse and later changed its mind, the Office can and does ask for a full account of the delay.

The word “unintentional” carries its ordinary meaning and it is unforgiving in one specific scenario. If the owner consciously decided not to pay – because the product was discontinued, the budget was cut, or the patent looked commercially dead – and only reconsidered when a competitor appeared, the delay was not unintentional. It was intentional and later regretted. A statement to the contrary in a petition is a statement to the Office, with everything that implies.

Two practical consequences follow. Document the cause of any missed payment contemporaneously rather than reconstructing it later. And treat a decision to abandon a patent as a decision that should be recorded, because the record you create at the moment of lapse is the record you will rely on if the commercial picture changes.

Intervening Rights: What a Lapse Costs Even After Revival

Reinstatement restores the patent. It does not restore the position you were in before it lapsed, and this is the part of maintenance fee practice most often overlooked when a revival petition is granted and everyone relaxes.

35 U.S.C. 41(c)(2) protects third parties who acted during the gap. A reinstated patent does not abridge or affect the right of any person, or their successors in business, who made, purchased, offered to sell or used anything protected by the patent after the six-month grace period expired and before the acceptance of the late maintenance fee. The court may also authorise the continued manufacture, use, offer for sale or sale of things made or purchased during that intervening period.

In commercial terms, a competitor who begins selling while your patent is expired can acquire a durable personal defence against that patent. It is not a licence and it is not transferable at will, but it is enough to take your most important target out of reach permanently. The patent comes back; the exclusivity against that particular actor may not.

  • The exposure window opens when the grace period ends, not when the fee was originally due.
  • It closes only when the Office accepts the delayed payment, so a slow petition extends the window.
  • Investment made in reliance on the lapse is exactly what the provision is designed to protect.
  • The risk is highest in crowded markets where competitors monitor expirations – which is to say, in precisely the markets where the patent matters.

This is the strongest argument against treating revival as a safety net. The petition process exists, it usually works, and it still leaves you worse off than paying on time. Reinstatement should be understood as damage limitation, not as an alternative payment schedule.

Building a Maintenance Fee Docket That Actually Holds

Most missed patent maintenance fees are not the result of ignorance about the schedule. They are the result of a docket that quietly stopped pointing at the right person.

The USPTO does not send a bill. It publishes the windows and expects the owner to act, and it sends correspondence to the address of record. That address is the first thing to go stale: firms merge, attorneys move, in-house counsel leave, and the notice that would have caught the problem goes to a mailbox nobody reads. Verifying the correspondence address and the fee address on every patent in the portfolio is a one-off task that prevents a recurring failure mode.

The second failure mode is ownership drift. A patent acquired in an asset purchase, carved out of a subsidiary, or taken as security rarely arrives with its docket attached. Where an assignment has not been recorded, the Office’s record still points at the previous owner, and the reminder – if any – goes to them.

  1. Docket all three windows at grant, not at the first anniversary, and docket the opening date and the surcharge date separately.
  2. Set the internal action date months ahead of the statutory date – the window is six months wide precisely so that it can absorb an approval cycle.
  3. Confirm entity status before each payment rather than inheriting it, since status can change between windows and an incorrect assertion has its own consequences.
  4. Reconcile the docket against the Office’s own patent maintenance fee records annually, so that a patent missing from your system is caught by the mismatch.
  5. Attach an owner – a named person, not a department – to every payment decision.
  6. Record assignments promptly, so that Office correspondence reaches whoever now holds the asset.

The economics favour discipline heavily. The cost of maintaining a patent is known years in advance and can be budgeted; the cost of a lapse is a petition, a surcharge, a gap in enforceability and a set of intervening rights you cannot buy back. For portfolios of any size, an annual review that asks which patents are still worth their next payment is worth more than any reminder system, because it converts a deadline into a decision.

Conclusion

Patent maintenance fees are a critical ongoing obligation for every utility patent owner. Missing a maintenance fee can mean losing patent protection — potentially irreversibly — for one of your most valuable assets. Careful tracking, strategic portfolio management, and timely fee payment are essential components of effective patent portfolio management. PerspireIP is here to help you manage your patent maintenance obligations and preserve the full value of your patent portfolio. Contact us today to discuss your patent maintenance needs.