Granted Patent
Utility
US 4,275,327 · App. 05/955,974
Incandescent electric lamp withheat recovery means
Inventor:
Peter J. Walsh
Patented Case
View Patent ↗
Granted: Jun 23, 1981
Filed: Oct 30, 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.