Laches is an equitable defense that may be raised in a patent-related proceeding. If a defending party can show that a patent holder exhibited unreasonable delay that caused prejudice to the defending party, the patent holder may be barred by laches from asserting the right.While the examples of “reasonable” and “unreasonable” delay provided in Symbol Techs. are informative (as are the fact-specific analyses from the other cases), a bright-line test for “unreasonable delay” had yet to be established in the prosecution laches context. That is, until the June 2021 decision of Gil Hyatt v. Hirshfeld (Fed. Cir. 2021). This case pertained to the laches defense raised by the USPTO when Hyatt filed an action under 35 U.S.C. § 145 to obtain four patents subsequent to receiving an affirmance of rejections of various claims at the Patent Trial and Appeal Board (PTAB).

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