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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761,381
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May. 31, 1904
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Surface Gage
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Henry J. Hjorth |
Cambridge, MA |
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861,283
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Jul. 30, 1907
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Wire Winding Tool
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Henry J. Hjorth |
Cambridge, MA |
Knight, Brown & Quinby - patent attorneys
Application renewed 12 Jun 1907.
Hjorth Lathe And Tool Company No. 1: "Perfection" Spring Winder. Pat. July 30, 1907. New Cond./ Orig. Box. Length: 5.00 Inches. These could be used either manually or in conjunction with a lathe to produce springs. The accompanying instruction pamphlet explains that the cost of the tool can be recouped in a single day of work.
(Description courtesy and copyrighted by Martin J. Donnelly Antique Tools)
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1,127,890
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Feb. 09, 1915
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T-Rest for Lathes
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Hendrick Julius Hjorth |
Woburn, MA |
Knight, Brown, Quinby & May - patent attorneys
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1,232,801
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Jul. 10, 1917
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Universal Lathe Attachment
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Hendrick Julius Hjorth |
Woburn, MA |
Wright, Brown, Quinby & May - patent attorneys
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