Tesla Patents Expiring
TESLA PATENTS EXPIRING.
A great stir has been made among electricians everywhere by the announcement covering the alternating current dynamo have just expired. They have been widely known for years as the "three fundamental patents." Their expiration is an event in the world of electricity not second in importance to the dying out of the Bell telephone patents. The alternating motor has been a monopoly.
Tesla has been drawing princely royalties on these patents, much of which the picturesque inventor is said to have applied to his experiments in wireless telegraphy. His mysterious tower at Wardencliffe, Long Island, is said to have been built in part by money subscribed by J. Pierpont Morgan and in part out of the royalties from the motor patents.
In 1885 Professor Galileo Ferraris of Turin, Italy, discovered the electro magnetic rotating field and applied his invention, according to William Stanley, to a rotating field motor. In 1888 Tesla received United States patents covering the broad application of the Ferraris discovery. George Weetinghouse bought the Tesla patents and also the rights of Ferraris.
The fundamental Tesla patents have been called the "patent pool trust." They have been attacked many times in the expiration of the patents releases to the world at large the immensely important principle of the rotary field. There will be a grand scramble everywhere to make the Tesla motor now invariably used, without paying any more royalty to Tesla.
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