Granted Patent
Utility
US 6,318,515 · App. 09/539,044
Hold down spring for a drum brake
Inventor:
Frank G. Pirrallo
Patented Case
View Patent ↗
Granted: Nov 20, 2001
Filed: Mar 30, 2000
Inventor
Frank G. Pirrallo
Assignee (at issue)
Delphi Technologies
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.