Term of patent (original) (raw)

The term of a patent is the maximum time during which it can be maintained in force. It is usually expressed in a number of years either starting from the filing date of the patent application or from the date of grant of the patent. In most patent laws, annuities or maintenance fees have to be regularly paid in order to keep the patent in force. Thus, a patent may lapse before its term if a renewal fee is not paid in due time.