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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482,864
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Sep. 20, 1892
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Split wheel
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Conrad M. Conradson |
Madison, WI |
The inventor had been working for Gisholt Machine Co., designing their heavy-duty turret lathes. According to the book, "Madison, a History of the Formative Years, 2nd ed.", after the first version of the lathe was in production, Conradson lost interest and began spending his time on his own projects; the company owner, John A. Johnson, was forced to fire him, which happened very roughly at the time of this patent. In 1917 Conradson would established the short-lived Conradson Machine Tool Co., makers of milling machines, lathes, planers, and radial drilling machines. |