Granted Patent
Utility
US 4,802,274 · App. 07/046,066
Method of determining worn rotary tool
Inventors:
Robert C. Petrof, Charles O. McHugh
Patented Case
View Patent ↗
Granted: Feb 7, 1989
Filed: May 4, 1987
Inventors
Robert C. Petrof
Charles O. McHugh
Assignee (at issue)
Ford Motor 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.