Granted Patent
Utility
US 4,257,510 · App. 05/901,375
Non-linear spring rate clutch damper
Inventor:
Walter A. Fisher
Patented Case
View Patent ↗
Granted: Mar 24, 1981
Filed: May 1, 1978
Inventor
Walter A. Fisher
Assignee (at issue)
BorgWarner 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.