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.
|
2,276,462
|
Mar. 17, 1942
|
Boring chuck
|
Harry F. Brown |
Detroit, Wayne County, MI |
The patent specification references the inventor's earlier patent 2,177,820.
An example of this invention has been seen. It is stamped with the patent number, "DeSoto Boring Chuck", and "DeSoto Tool Co., Detroit". The DeSoto Boring Chuck was written up in various metalworking magazines in the mid-1940s. We have also seen an undated sales brochure for "Samson" boring chucks, "Pat. No. 2276462". The last page of the brochure says, "Manufactured by Gray-Grimes Tool Co. for Last Word Sales Company / 18500 Mt. Elliott / Detroit 34, Michigan / Also, distributor of Last Word Wheel Dressers / Gray-Grimes Steady-Rests". |