Granted Patent
Utility
US 4,215,906 · App. 06/058,879
Zero slip four-point contact thrust bearing
Inventor:
John M. Speicher
Patented Case
View Patent ↗
Granted: Aug 5, 1980
Filed: Jul 19, 1979
Inventor
John M. Speicher
Assignee (at issue)
General Dynamics Corporation
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.