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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76,328
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Apr. 07, 1868
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Improvement in friction-clutch
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James B. Johnson |
San Francisco, CA |
"The object of our invention is to provide an improved clutch, to be used upon hoisting-apparatus, pulleys, ratchet-drills, or in any place where a free motion about the axle is desired in one direction, while it is desirable to have the whole mechanism move together in the other..."
J. B. Johnson of San Francisco won a First—Diploma for his "patent friction hoist" at the 1868 Fair of the (California) State Agricultural Society. |
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Improvement in friction-clutch
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William H. Birch |
San Francisco, CA |
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