Granted Patent
Utility
US 5,239,231 · App. 07/664,689
Filament attachment method for dual filament halogen lamp having a common ground connection
Inventor:
Robert A. Grunder
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Mar 5, 1991
Inventor
Robert A. Grunder
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.