Granted Patent
Utility
US 4,358,168 · App. 06/213,824
Thrust bearing
Inventor:
Ingmar Kallin
Patented Case
View Patent ↗
Granted: Nov 9, 1982
Filed: Dec 8, 1980
Inventor
Ingmar Kallin
Assignee (at issue)
Chore-Time Equipment, Inc.
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.