The United States Patent and Trademark Office appeals a judgment of the United States District Court for the District of Columbia. Patent applicant Gilbert P. Hyatt filed an action under 35 U.S.C. § 145 against the Patent and Trademark Office to obtain four patents. The Patent and Trademark Office asserted affirmative defenses of prosecution laches and invalidity for anticipation and lack of written description. The district court first held a trial on prosecution laches and subsequently held trials on anticipation and written description. Following a Rule 52(c) motion at the first trial, the district court decided that the Patent and Trademark Office failed to carry its burden of proving prosecution laches. Following the patentability trials, the district court decided that certain claims were not invalid for anticipation or lack of written description and ordered the Patent and Trademark Office to issue patents as to those claims.
We hold that prosecution laches is a defense available to the Patent and Trademark Office in an action to obtain a patent under 35 U.S.C. §145. We further hold that the district court erred in concluding that the Patent and Trademark Office had failed to prove prosecution laches. Accordingly, consistent with the principles of fairness and due process, we vacate and remand the district court’s decision on prosecution laches for further proceedings consistent with this opinion and to provide Hyatt the opportunity to present evidence on that issue. We hold the remainder of the case in abeyance, retaining jurisdiction over the anticipation and written description issues.
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