Granted Patent
Utility
US 4,795,012 · App. 07/053,940
Spiral spring disc torsional coupling
Inventor:
Metin M. Durum
Patented Case
View Patent ↗
Granted: Jan 3, 1989
Filed: May 26, 1987
Inventor
Metin M. Durum
Assignee (at issue)
Borg-Warner Automotive, 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.