What Happens When a Patent's Maintenance Fees Go Unpaid?

Obtaining a patent is expensive and time-consuming. But the cost doesn't stop at grant. The USPTO charges maintenance fees at three points during a utility patent's life, and if the patent owner doesn't pay, the patent expires.

This happens more often than you might expect, and it's worth understanding how maintenance fees work if you're tracking patent status.

When maintenance fees are due

Maintenance fees are due at 3.5, 7.5, and 11.5 years after the patent's grant date. There are also grace periods: the patent owner can pay with a surcharge for up to 6 months past each deadline.

The actual deadlines break down like this:

• 3.5-year fee: Due between 3 and 4 years post-grant (grace period ends at 4 years)
• 7.5-year fee: Due between 7 and 8 years post-grant
• 11.5-year fee: Due between 11 and 12 years post-grant

If none of the three fees are paid, a 20-year utility patent effectively becomes a 4-year patent (or less if the first fee is missed early).

What happens if a fee is missed

If the maintenance fee and any applicable surcharge are not paid by the end of the grace period, the patent goes abandoned. The USPTO publishes the abandonment, and the patent is considered expired.

Once expired for nonpayment, the patent can no longer be enforced. Anyone can practice the invention without needing a license.

Reinstatement: bringing a lapsed patent back

There is a process for reinstating a patent that lapsed due to nonpayment, but it has limits. The patent owner must petition the USPTO within a certain window (generally within 24 months of the maintenance fee deadline) and show that the delay was "unintentional."

"Unintentional" has been interpreted fairly broadly, but the petitions are not automatic. The USPTO can deny reinstatement if the delay wasn't genuinely unintentional. During the lapsed period before reinstatement, the patent is effectively unenforceable, and products made and sold during that time may be protected from infringement claims even if the patent is later reinstated.

Why companies sometimes don't pay

Not every lapse is accidental. Patent portfolios cost money to maintain, and companies regularly audit their patents to decide which are worth the fees.

A patent covering a technology that's been superseded, a product line that's been discontinued, or an area where the company no longer operates may simply be allowed to lapse. Large companies make these decisions systematically.

This is also why old, broad patents sometimes expire before their 20-year term is up. The patent was valuable early on but not worth maintaining by year 11 or 12.

Maintenance fees don't apply to all patents

Only utility patents have maintenance fee requirements. Design patents and plant patents do not. Once issued, a design or plant patent runs its full term without any fee maintenance obligations.

This is one of the practical reasons some inventors pursue design patents in addition to or instead of utility patents for certain applications.

How to check maintenance fee status

The USPTO's Patent Center (patentcenter.uspto.gov) shows maintenance fee status for any utility patent. Look for the fee status field in the bibliographic data tab. Status options include:

• Undiscounted or Large Entity: Fees have been paid at the full rate
• Small Entity or Micro Entity: Fees paid at reduced rates
• Expired: Patent has expired due to nonpayment

The Patent Sunset calculator checks maintenance fee status as part of its expiration date calculation. If a patent expired early due to unpaid fees, that's reflected in the result rather than showing the full 20-year date.

What this means for competitive monitoring

If you're watching a competitor's patents, maintenance fee lapses can be significant. A patent that lapses at year 7 opens up protected technology 13 years earlier than expected. It's worth checking fee status, not just calculating the 20-year window.

For patent landscapes covering dozens or hundreds of patents, manual fee checks get tedious fast. Automated patent databases and calculators that pull live maintenance fee data are more practical at that scale.