Granted Patent
Utility
US 4,409,512 · App. 06/291,941
Incandescent electric lamp with etalon type transparent heat mirror
Inventor:
Peter J. Walsh
Patented Case
View Patent ↗
Granted: Oct 11, 1983
Filed: Aug 11, 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.