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US Patent: 427,978
Alternating-current motor
Patentee:
Michael von Dolivo-Dobrowolsky (exact or similar names) - Berlin, Germany

USPTO Classifications:
310/211, 310/212, 310/268

Tool Categories:
electrical devices : electric motors : induction motors
electrical devices : electric motors : multiphase motors

Assignees:
Allgemeine Elektricitäts-Gesselschaft - Berlin, Germany

Manufacturer:
Not known to have been produced

Witnesses:
George H. Murphy
F. von Verrin

Patent Dates:
Applied: Nov. 13, 1889
Granted: May 13, 1890

Patent Pictures:
USPTO (New site tip)
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Report data errors or omissions to steward Jeff Joslin
Description:
Electric motor based on the two-phase power system developed by "Professor Ferraris in Turin", which was identical in almost every respect to that simultaneously developed by Tesla (patents 382,279, 382,280, 382,281, and 382,282). The Ferraris / Tesla was licensed by Westinghouse from both men, but Westinghouse (even with assistance from Tesla) was ultimately unsuccessful in commercializing it. Westinghouse would instead be successful with the three-phase power system that would later be developed by von Dolivo-Dobrowolsky.

This patent is equivalent to a series of European patents, all granted in 1889: German patent DE-51,083, French patent FR-199,154, Belgian patent 86,818, Luxembourg patent LU-1,153, Italian patent "July 4, 1889, L, 456", and Swiss patent CH-1,532.

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