Granted Patent
Utility
US 4,990,043 · App. 07/331,271
Lock nut
Inventors:
Paul B. Hafeli, Dennis B. Kneff
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Mar 30, 1989
Inventors
Paul B. Hafeli
Dennis B. Kneff
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.