Granted Patent
Utility
US 4,753,541 · App. 07/070,370
Sealed thrust bearing
Inventor:
Donald D. Brown
Patented Case
View Patent ↗
Granted: Jun 28, 1988
Filed: Jul 7, 1987
Inventor
Donald D. Brown
Assignee (at issue)
Hayes Industrial Brake, 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.