Originally Posted by magnet
But The new question is : If they dont work,why they have patent?
|
You don't need to show that something works in order to obtain a patent for it. However, perpetual motion machines are automatically excluded from patent consideration, so whatever was patented was not claimed as a perpetual motion machine to the USPTO.
Also, perpetual motion is not a permitted topic on this forum, this is part of the rules that you agreed to when you signed up for the account.