Granted Patent
Utility
US 4,809,821 · App. 06/752,487
Disc brake corrosion barrier
Inventor:
Keith H. Fulmer
Patented Case
View Patent ↗
Granted: Mar 7, 1989
Filed: Jul 5, 1985
Inventor
Keith H. Fulmer
Assignee (at issue)
AlliedSignal, 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.