Granted Patent
Utility
US 4,403,047 · App. 06/182,736
Asbestos-free friction material
Inventor:
Clarence C. Albertson
Patented Case
View Patent ↗
Granted: Sep 6, 1983
Filed: Aug 29, 1980
Inventor
Clarence C. Albertson
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.