Granted Patent
Utility
US 4,601,412 · App. 06/549,351
Polymeric grease gun
Inventor:
Donald E. Martin
Patented Case
View Patent ↗
Granted: Jul 22, 1986
Filed: Nov 7, 1983
Inventor
Donald E. Martin
Assignee (at issue)
REXNORD GMBH
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.