Granted Patent
Utility
US 6,739,352 · App. 10/414,317
Self-piercing radiator drain valve
Inventor:
Jim F. G. Munro
Patented Case
View Patent ↗
Granted: May 25, 2004
Filed: Apr 15, 2003
Inventor
Jim F. G. Munro
Assignee (at issue)
GENERAL MOTORS OF CANADA LIMITED
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.