Granted Patent
Utility
US 4,302,986 · App. 05/875,500
Plastic hub torsional vibration damper
Inventor:
Michael Shepherd
Patented Case
View Patent ↗
Granted: Dec 1, 1981
Filed: Feb 6, 1978
Inventor
Michael Shepherd
Assignee (at issue)
Wallace Murray 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.