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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27,040
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Feb. 07, 1860
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Improved steam-trap
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Frank Douglas |
Norwich, CT |
An article in 1860-02-18 Scientific American about this invention concludes, "The patent for this invention was issued... to Frank Douglas, who has sold half of it to C. B. Rogers & Co., and persons desiring further information in relation to it, may address Douglas, Rogers & Co., Norwich, Conn." |
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27,704
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Apr. 03, 1860
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Steam-engine
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Frank Douglas |
Norwich, CT |
An article in 1860-05-05 Scientific American about this invention concludes, "The patent for this invention was obtained by Frank Douglas... and further information in relation to it may be obtained by addressing Douglas, Rogers & Co., Norwich, Conn." |
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39,799
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Sep. 08, 1863
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Improvement in governors for steam-engines
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Frank Douglas |
Norwich, CT |
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39,800
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Sep. 08, 1863
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Improvement in skate-fastenings
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Frank Douglas |
Norwich, CT |
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