In the last few years, the US Supreme Court has held that laches is not an available defence to claims for copyright or patent infringement brought within the limited periods described under each of the Copyright and Patent Acts. In Pinkette Clothing, Inc. v Cosmetic Warriors Limited, the Ninth Circuit Court of Appeals affirmed a distinction between available defences to copyright and patent infringement claims, on the one hand, and trade mark infringement claims, on the other hand, holding that laches is an equitable defence to a trade mark cancellation action because the Lanham Act has no statute of limitations and expressly makes laches a defence to a cancellation action.