The USPTO will not knowingly issue a patent for a perpetual motion machine and the American Physical Society states that they deplore attempts to mislead and defraud the public based on claims of perpetual motion machines or sources of unlimited useful free energy, unsubstantiated by tested established physical principles.
However, on a personal note, I am fascinated with this stuff. Did the USPTO miss a few patents for forbidden machines that were granted; for example: patent No. 6,362,718 for a “Motionless Electromagnetic Generator”.
Free Energy & The Laws of Thermodynamics
The existence of a perpetual motion machine has been generally accepted as being impossible according to accepted laws of physics. In particular, most scientists believe that perpetual motion machines would violate:
either the first law of thermodynamics, the law of conservation of energy – a perpetual motion machine which produces power without energy uptake. Such a machine would, once started, operate indefinitely.
or second law of thermodynamics that entropy, or disorder, always increases – a perpetual motion machine which converts heat completely into other forms of energy.
With the principles of thermodynamics being so well established, serious proposals for perpetual motion machines are met with disbelief on the part of most physicists, which makes a discussion of the merits of the proposal difficult if not impossible.