Granted Patent
Utility
US 4,375,605 · App. 06/264,234
Ellipsoidal envelope for incandescent lamp with infrared energy return means
Inventors:
Raymond Fontana, Peter J. Walsh
Patented Case
View Patent ↗
Granted: Mar 1, 1983
Filed: May 18, 1981
Inventors
Raymond Fontana
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.