Granted Patent
Utility
US 4,564,762 · App. 06/610,760
Smoke detector
Inventors:
Charles F. Doherty, Robert Johnson
Patented Case
View Patent ↗
Granted: Jan 14, 1986
Filed: May 16, 1984
Inventors
Charles F. Doherty
Robert Johnson
Assignee (at issue)
Pyrotector, 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.