Patent Term

What It Means

Patent term is the duration of the legal monopoly that a patent provides. For U.S. utility patents filed on or after June 8, 1995, the term is 20 years from the earliest effective filing date. For patents filed before that date, the term is the later of 17 years from grant or 20 years from filing. Design patents filed on or after May 13, 2015 have a 15-year term from the date of grant. The effective patent term — the period during which the patent actually provides commercial value — is often shorter than the nominal term because years can pass between filing and grant. If a drug patent takes 5 years of prosecution and regulatory approval before the product reaches market, only 15 years of the 20-year term remain for commercial exploitation. The patent term can be adjusted in certain circumstances. Patent Term Adjustment (PTA) adds time to compensate for USPTO delays during prosecution. Patent Term Extension (PTE) can add up to 5 years for pharmaceutical patents to compensate for FDA regulatory review time. Conversely, terminal disclaimers can shorten the term to avoid double-patenting rejections. Maintenance fees are required at 3.5, 7.5, and 11.5 years after grant to keep a utility patent in force; failure to pay results in the patent expiring early. Understanding patent term is essential for predicting patent cliffs: the expiration date determines when generic competition can begin and when technologies enter the public domain.

Frequently Asked Questions