In 1996, the law governing the term of a U.S. patent changed. Today, a patent expires twenty (20) years from the date of filing of the corresponding patent application. For patent applications filed under the old law, the applicants may elect a term extending seventeen (17) years from the date of issue of the patent. The perceptive reader will have noted that, under the old law, time spent in prosecution was not deducted from the term of the patent.