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US Patent: 1,748,819
Lubricating Coupler
Patentee:
Oscar U. Zerk - Chicago, IL

USPTO Classifications:
184/105.3, 285/55, 285/9.2

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Oct. 21, 1929
Granted: Feb. 25, 1930

Patent Pictures:
USPTO pdf tiff
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Grease Gun Buyers Guide
Biography of Oscar Zerk
Grease Fitting
Oscar Ulysses Zerk
Description:
Slough & Canfield - patent attorneys

This is the patent for the zerk grease fitting that is in common use today.

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