The claim based on the honour of the Crown is not barred by the law of limitations or the equitable doctrine of laches. (slaw.ca)
Rather, as the Supreme Court has explained in a series of decisions over the past decade, the rule in patent cases should be the same as in any other sort of litigation — in this case, the equitable doctrine of laches may not be used by accused infringers as a defense because there is a statute of limitations present to limit claims. (foleyhoag.com)
Carole J. Brown, J. held that the equitable claims were barred by the doctrine of laches. (practicepro.ca)