Granted Patent
Utility
US 4,280,076 · App. 05/952,268
Incandescent lamp with structure for collecting evaporated filament material
Inventor:
Peter J. Walsh
Patented Case
View Patent ↗
Granted: Jul 21, 1981
Filed: Oct 18, 1978
Inventor
Peter J. Walsh
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.