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The term of a patent is the maximum period 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. (Wikipedia)

The Court of Appeals also wrote that Allan Block was not attempting to extend the term of a patent, so Brulotte v. Thys Co., 379 U.S. 29 (1964) does not apply. (Tech Law Journal)

The patent misuse doctrine could also be applied to use of licensing agreements to extend the term of a patent or to extract royalties as a percentage of profit from sales of other products or goods. (Wikipedia)