Granted Patent
Utility
US 4,620,641 · App. 06/808,080
Access plug for threaded holes in electric starting apparatus
Inventor:
Arthur G. Beer
Patented Case
View Patent ↗
Granted: Nov 4, 1986
Filed: Dec 12, 1985
Inventor
Arthur G. Beer
Assignee (at issue)
General Motors LLC
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.