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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667,406
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Feb. 05, 1901
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Variable Speed Gearing
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William L. Schellenbach |
Cincinnati, OH |
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683,003
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Sep. 17, 1901
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Variable-speed mechanism
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William L. Schellenbach |
Cincinnati, OH |
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74,997
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Mar. 04, 1902
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Variable speed mechanism
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William Lorraine Schellenbach |
Cincinnati, OH |
This is the Canadian equivalent of US patent 683,003, which was explicitly assigned to National Machine Tool Co. of Cincinnati. |
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725,779
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Apr. 21, 1903
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Screw mechanism
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William L. Schellenbach |
Cincinnati, OH |
"...in an ordinary engine-lathe the accuracy of the screws produced depends upon the original and maintained accuracy of the lead-screw of the lathe. If the lead-screw be employed also for general feeding purposes, then its accuracy becomes very much impaired by wear..." This invention proposes serving these two conflicting functions of the lead-screw by using a single lead-screw with a double thread: one thread for general feeding and one for screw-cutting. |
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795,420
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Jul. 25, 1905
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Key-seating tool
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William L. Schellenbach |
Cincinnati, OH |
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