Granted Patent
Utility
US 4,539,240 · App. 06/676,144
Asbestos free friction element
Inventor:
Robert V. Wargin
Patented Case
View Patent ↗
Granted: Sep 3, 1985
Filed: Nov 29, 1984
Inventor
Robert V. Wargin
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.