Granted Patent
Utility
US 4,243,110 · App. 06/010,438
Pneumatic percussion drill with exhaust cooling and lubrication of chuck end
Inventors:
James T. Clemenson, Robert R. Vincent
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Feb 8, 1979
Inventors
James T. Clemenson
Robert R. Vincent
Assignee (at issue)
Cooper Industries Holdings
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.