Liberating Aerospace IP

There is a thread on slashdot that directly relates to the patent trolling studies that Chris is leading. It describes how the FAA has tied up tons of intellectual property surrounding abandoned aircraft designs and will now release it. This is quite similar to the way that startup companies will lock down the rights on nanotechnology concepts and then dissolve without willing their rights to someone that would make use of it. I think that there should be an amendment to patent law that basically says if you don't use it you loose it.