Granted Patent
Utility
US 4,511,889 · App. 06/431,048
Surge protected smoke alarm
Inventor:
Richard G. Atwater
Patented Case
View Patent ↗
Granted: Apr 16, 1985
Filed: Sep 30, 1982
Inventor
Richard G. Atwater
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.