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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28,639
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Jun. 05, 1860
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Apparatus for dressing grindstones
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John F. Schuyler |
Philadelphia, PA |
An 1861 ad from George C. Howard lists their products manufactured, including "Schuyler's Hacker for Trueing and Sharpening Grindstones". |
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28,864
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Jun. 26, 1860
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Printing-press
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George C. Howard |
Philadelphia, PA |
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42,738
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May. 17, 1864
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Grindstone-dresser
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Lewis Semple |
Philadelphia, PA |
This patent notes a predecessor in Schuyler's grindstone dresser of patent 28,639 but says that Schuyler's dresser-wheel construction was "difficult and expensive, and also very liable to fracture in use". The dresser-wheel of Barkley and Semple is cast in a chilled mold and is claimed to be rugged enough to not require the yielding washers of Schuyler's invention. |
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Grindstone-dresser
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Robert Barkley |
Philadelphia, PA |
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61,738
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Feb. 05, 1867
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Improvements in dressing grindstones
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George C. Howard |
Philadelphia, PA |
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89,834
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May. 04, 1869
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Improvement in hat-presses
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George C. Howard |
Philadelphia, PA |
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