Granted Patent
Utility
US 5,038,599 · App. 07/506,773
Ball lock punch retainer
Inventor:
Charles G. Wellman
Patented Case
View Patent ↗
Granted: Aug 13, 1991
Filed: Apr 10, 1990
Inventor
Charles G. Wellman
Assignee (at issue)
AIP Inc.
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.