Granted Patent
Utility
US 4,297,611 · App. 06/081,270
Control of tungsten filament erosion in a halogen lamp
Inventor:
Salvatore F. Cortorillo
Patented Case
View Patent ↗
Granted: Oct 27, 1981
Filed: Oct 2, 1979
Inventor
Salvatore F. Cortorillo
Assignee (at issue)
Wagner Electric 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.