Granted Patent
Utility
US 4,154,491 · App. 05/787,686
Retainer ring for cylindrical roller bearings
Inventors:
William J. Derner, James Elliott
Patented Case
View Patent ↗
Granted: May 15, 1979
Filed: Apr 14, 1977
Inventors
William J. Derner
James Elliott
Assignee (at issue)
FMC 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.