mecanum patents

[Tristan Lall]

Try this link: http://www.chiefdelphi.com/forums/pa...le&paperid=556

That's the patent in question, saved as a .pdf file. To see it on the USPTO site, you need a .tiff viewer.

As for being expired, it depends. It's likely that Sweden, the U.S. and Poland are all signatories to the PCT, so it is possible that an application was made to extend the U.S. patent (and/or Swedish patent, if it exists) worldwide. Though that patent would probably have expired, there may be other patents derived from it that are still in force.