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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.

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patents patent drawings us patent office images extracted from united states patents magnet motor perpetual motion machine screws inventions
date_range

Date

24/04/1979
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in collections

Perpetuum mobile

Hypothetical machine that can do work infinitely without an external energy source.
create

Source

USPTO
link

Link

http://uspto.gov/
copyright

Copyright info

public domain

label_outline Explore Images Extracted From United States Patents, Screws

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patents patent drawings us patent office images extracted from united states patents magnet motor perpetual motion machine screws inventions