If you find a patent number or patent date by this manufacturer that is not on this
list, please contact the Site Historian.
Key to Links for Patent Information
USPTO = U.S. Patent Office .
Images of the actual patent can be viewed on the U.S. Patent Office web site but
a special TIFF viewer must be installed with your browser in order properly work.
More information on how to configure your computer to view these patents can be
found at TIFF image Viewers
for Patent Images.
DATAMP = Directory of American Tool And
Machinery Patents . A sister site to VintageMachinery.org with information
on patents related to machinery and tools. A much easier user interface than the
USPTO's for finding information on machinery patents.
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620,609
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Mar. 07, 1899
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Motor
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Edwin S. Pillsbury |
St. Louis, MO |
Seen on a Wagner single-phase 3/4 horse motor with patent dates ranging between 1888-09-11 to 1910-05-31. Also seen on a Century Electric motor that also had the date for patent 718,518. |
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Motor
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Ferdinand Schwedtmann |
St. Louis, MO |
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718,518
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Jan. 13, 1903
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Electric motor
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Edwin S. Pillsbury |
St. Louis, MO |
Seen on a Century Single-phase 104/208 volt motor, along with an 1899-03-07 patent date, corresponding to patent 620,609; this patent is an improvement on the earlier one. |
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1,093,074
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Apr. 14, 1914
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Electric motor
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Edwin S. Pillsbury |
St. Louis, MO |
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1,122,633
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Dec. 29, 1914
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Dynamo-electric machine
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Edwin S. Pillsbury |
St. Louis, MO |
Seen on a 1/4 HP single-phase repulsion-start induction-run motor, and a 3 HP 3-phase induction motor, from Century Electric. The patent covers the constructed of the laminated iron stator. |
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1,130,017
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Mar. 02, 1915
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Centrifugal circuit-changing device for electric motors
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Edwin S. Pullsbury |
St. Louis, MO |
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1,157,179
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Oct. 19, 1915
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Centrifugal circuit-changing device for electric motors
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Edwin S. Pillsbury |
St. Louis, MO |
Seen on a 1/4 HP single-phase repulsion-start induction-run motor, and a 3 HP 3-phase induction motor, from Century Electric. |