Granted Patent
Utility
US 5,546,074 · App. 08/110,131
Smoke detector system with self-diagnostic capabilities and replaceable smoke intake canopy
Inventors:
Brian Andrew Bernal, Robert Gerard Fischette, Kirk R. Johnson, Douglas H. Marman
Patented Case
View Patent ↗
Granted: Aug 13, 1996
Filed: Aug 19, 1993
Inventors
Brian Andrew Bernal
Robert Gerard Fischette
Kirk R. Johnson
Douglas H. Marman
Assignee (at issue)
Sentrol, Inc.
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.