The World's Largest Public Domain Media Search Engine
Patent drawing - USPatent4151431-1 - . Public domain  image

Patent drawing - USPatent4151431-1 - . Public domain image

description

Summary

:Image:USPatent4151431-2.png Sheet 1 of 2 from US patent 4151431, Permanent magnet motor by Howard R. Johnson, an acclaimed perpetual motion machine based on permanent magnets.

The history of perpetual motion machines dates back to the Middle Ages. For millennia, it was not clear whether perpetual motion devices were possible or not, but the development of modern theories of thermodynamics has shown that they are impossible. Despite this, many attempts have been made to construct such machines, continuing into modern times. Modern designers and proponents often use other terms, such as "over unity", to describe their inventions.

date_range

Date

24/04/1979
create

Source

USPTO
copyright

Copyright info

public domain

Explore more

patents
patents