Granted Patent
Utility
US 4,591,752 · App. 06/541,997
Incandescent lamp with high pressure rare gas filled tungsten-halogen element and transparent thick walled safety envelope
Inventors:
Wolfgang E. Thouret, Rudolph Kaufman, Harry Kee
Patented Case
View Patent ↗
Granted: May 27, 1986
Filed: Oct 14, 1983
Inventors
Wolfgang E. Thouret
Rudolph Kaufman
Harry Kee
Assignee (at issue)
Duro-Test Corporation
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.