Granted Patent
Utility
US 4,432,041 · App. 06/453,603
Smoke penetrating emergency light
Inventors:
Richard E. Pfisterer, Richard M. Schultz
Patented Case
View Patent ↗
Granted: Feb 14, 1984
Filed: Dec 27, 1982
Inventors
Richard E. Pfisterer
Richard M. Schultz
Assignee (at issue)
Firex 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.