How long does a US utility patent last?

US utility patents filed on or after June 8, 1995 last 20 years from the earliest non-provisional filing date, plus any Patent Term Adjustment (PTA) and Patent Term Extension (PTE).

How long does a US design patent last?

US design patents filed on or after May 13, 2015 last 15 years from the grant date. Design patents filed before May 13, 2015 last 14 years from the grant date.

What is Patent Term Adjustment (PTA)?

Patent Term Adjustment compensates patent owners for USPTO delays during prosecution. PTA adds days to the patent term based on delays caused by the USPTO.

What is a terminal disclaimer?

A terminal disclaimer limits a patent's term to expire on the same date as an earlier related patent. It is often filed to overcome obviousness-type double patenting rejections.

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Terminal Disclaimer Filed

This patent has a terminal disclaimer.

The actual expiration date cannot be determined by simple calculation. Terminal disclaimers tie a patent's expiration to one or more related patents.

The file wrapper history must be examined
Related patent(s) in the disclaimer must be identified
Any terminal disclaimers on those patents must be checked

Recommendation: Contact a patent attorney to examine the complete file history and determine the actual expiration date.

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