Granted Patent
Utility
US 4,448,262 · App. 06/379,772
Pneumatic hammer
Inventor:
Robert R. Vincent
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: May 19, 1982
Inventor
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.