A great stir has been made among
everywhere by the announcement
covering the alternating current dynamo
have just expired. They have been widely
known for years as the "three
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
on these patents, much of which the
picturesque inventor is said to have
to his experiments in wireless
His mysterious tower at
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
rotating field and applied his
according to William Stanley, to a
rotating field motor. In 1888 Tesla
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.
Source
18 Nov 1905 - TESLA PATENTS EXPIRING.