Possibly, patent should have some minimal effort time. After, say, 3 years you have to demonstrably prove that you will take the patent to market. For example, a software product should have some code written that uses the patent, even if incomplete. So long as you do nothing with the patent, anyone can get a royalty free license to it when they challenge you (after the grace period).<p>This would encourage people to take their innovations to market, instead of sitting on them and bunkrupting anyone else who tries to.