Granted Patent
Utility
US 4,144,740 · App. 05/901,933
Testing apparatus and method for measuring cutting, chipping and abrasion resistance
Inventor:
James R. Beatty
Patented Case
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Granted: Mar 20, 1979
Filed: May 1, 1978
Inventor
James R. Beatty
Assignee (at issue)
B. F. Goodrich Company
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.