Granted Patent
Utility
US 4,461,973 · App. 06/359,743
Energy-efficient incandescent lamp with improved filament characteristics
Inventors:
Rudolph Kaufman, Wolfgang E. Thouret
Patented Case
View Patent ↗
Granted: Jul 24, 1984
Filed: Mar 19, 1982
Inventors
Rudolph Kaufman
Wolfgang E. Thouret
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.