How to calculate the expiration date of American patents

1invention patents and plant patents filed on or after June 8, 995, the patent protection period is 20 years from the actual application date; The patent protection period of design is 14 years from the date of patent authorization.

For an application for a patent for invention from May 29, 2000, the US Patent and Trademark Office will appropriately adjust the patent protection period according to the time delayed by the Patent and Trademark Office or the inventor. For example, due to the delay of the Patent and Trademark Office, the patent application is not approved within three years, and the Patent and Trademark Office will increase the patent term by more than three years.

For invention patents filed before1June 8, 1995 but authorized after1June 8, 1995 or still valid on1June 8, 1995, the patent protection period is the longer of the following two periods: from the date of authorization 17 years or from the date of application.