two patents on six machines designed to convert gravity to mechanical energy.

[brian334]

The PTO will not issue a patent on a machine that can not work.

[Pirate88179]

The PTO will not issue a patent on a machine that can not work.

Not true at all.  They do it every day.  It is only for the protection of intellectual property, nothing more.  If something works, or not, is not part of the equation.

PS  If you look hard enough, you will find patents on "teleporters" a la star trek yet try to buy a working model.

[utilitarian]

The PTO will not issue a patent on a machine that can not work.

But they issued your patents, and we all know your weather-making machines cannot work.  I am confused.

[brian334]

It’s a good thing the PTO is not confused about what is patentable.
Machines that can not work are not patentable.

[Pirate88179]

It’s a good thing the PTO is not confused about what is patentable.
Machines that can not work are not patentable.

Here is a quote of just one of many patented devices that have been since proven not to work:

"In 1999, Sanjay Amin of Youngstown, Ohio, established Entropy Systems Inc. (ESI). The company received a 3.5 million dollar investment for a device that is claimed to violate the second law of thermodynamics, producing power by absorbing heat from atmospheric air (and that external reservoir can be at any temperature, even sub-zero). The technology had been patented in the United States, Europe, and Australia. The claims have subsequently been shown to be false and no product was ever released."

Note that the device received patents in 3 different countries.

Many, many other examples can be found here:

http://en.wikipedia.org/wiki/History_of_perpetual_motion_machines

This happens all of the time.