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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)

Since the patent term (35 U.S.C. 154) would expire on ___, the period of extension is the number of days to extend the term of the patent from its expiration date to and including ___, or ___ days. (Official website of the United States Patent and Trademark Office)