Brief Fact Summary. Chaides (Defendant) had actual notice of Aukerman’s (Plaintiff) patents and potential infringement claims.Â It refused to license the slip-form molds that potentially infringed Plaintiff’s patents.Â Following several years of communication attempts and license offers, Plaintiff filed an infringement suit.
Synopsis of Rule of Law. Principles of laches and equitable estoppel are legitimate defenses to patent infringement suits.
Mere delay or acquiescence cannot defeat the remedy by injunction in support of the legal right, unless it has been continued so long and under such circumstances as to defeat the right itself.View Full Point of Law
Issue. Are principles of laches and equitable estoppel legitimate equitable defenses to patent infringement suits?
Held. (Nies, C.J.)Â Yes.Â Principles of laches and equitable estoppel are legitimate defenses to patent infringement suits.Â Laches is cognizable under 35 U.S.C. Â§ 282 as an equitable defense to a claim for patent infringement and may prevent the patentee’s claim for damages.Â Laches has two elements: (1) the patentee’s delay in bringing suit was unreasonable and inexcusable; and (2) the alleged infringer suffered material prejudice because of the delay.Â A presumption of laches comes up if the patentee knew or should have known about the alleged infringement.Â The presumption has the effect of shifting the burden of going forward with the evidence, not the burden of persuasion.Â Equitable estoppel is also within the jurisdiction of the court under 35 U.S.C. Â§ 282 as an equitable defense.Â Equitable estoppel has three elements: (1) the patentee through misleading conduct led the alleged infringer to reasonably infer that the patentee did not intend to enforce the patent; (2) the alleged infringer relied upon the conduct of the patentee; and (3) because of its reliance, the alleged infringer would be materially prejudiced if the patentee may proceed with its claim.Â Reversed.
Discussion. There has been a noticeable increase in the use of equitable defenses based on the conduct of the patentee.Â Though a patent is presumed to be valid, presumption can be shifted by the types of equitable defenses explained in the case.Â This basically means the patentee must come to court with clean hands for judicial relief to be granted.