Granted Patent
Utility
US 4,720,652 · App. 07/004,470
Sealed beam headlamp and method for testing its serviceability
Inventor:
Richard DuBois
Patented Case
View Patent ↗
Granted: Jan 19, 1988
Filed: Jan 20, 1987
Inventor
Richard DuBois
Assignee (at issue)
Cooper Industries Holdings
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.