Granted Patent
Utility
US 4,461,969 · App. 06/264,473
Incandescent electric lamp with means for reducing effects of deposition of filament material
Inventor:
Peter J. Walsh
Patented Case
View Patent ↗
Granted: Jul 24, 1984
Filed: May 18, 1981
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.