Granted Patent
Utility
US 4,989,998 · App. 07/437,904
Bearings
Inventors:
Michael Willis, Ewan N. F. Robbie
Patented Case
View Patent ↗
Granted: Feb 5, 1991
Filed: Nov 17, 1989
Inventors
Michael Willis
Ewan N. F. Robbie
Assignee (at issue)
Vandervell Limited
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.