Granted Patent
Utility
US 4,730,967 · App. 06/882,021
Adjustable anti-rotation device for a fastener receptacle
Inventor:
Roy L. Warkentin
Patented Case
View Patent ↗
Granted: Mar 15, 1988
Filed: Jul 3, 1986
Inventor
Roy L. Warkentin
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.