Granted Patent
Utility
US 4,809,822 · App. 07/098,150
Disc brakes
Inventor:
Hugh G. Margetts
Patented Case
View Patent ↗
Granted: Mar 7, 1989
Filed: Sep 18, 1987
Inventor
Hugh G. Margetts
Assignee (at issue)
Lucas Industries public limited company
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.