Granted Patent
Utility
US 4,969,443 · App. 07/402,317
Open secondary detection via reverse circuit sensing
Inventor:
Charles J. DeBiasi
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: Sep 5, 1989
Inventor
Charles J. DeBiasi
Assignee (at issue)
Ford Motor 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.