Granted Patent
Utility
US 4,822,183 · App. 07/240,183
Thrust ball bearing with improved sealing
Inventor:
Frederick E. Lederman
Patented Case
View Patent ↗
Granted: Apr 18, 1989
Filed: Sep 6, 1988
Inventor
Frederick E. Lederman
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.