Granted Patent
Utility
US 4,075,499 · App. 05/742,194
Smoke detector with means for changing light pulse frequency
Inventor:
William J. Malinowski
Patented Case
View Patent ↗
Granted: Feb 21, 1978
Filed: Nov 16, 1976
Inventor
William J. Malinowski
Assignee (at issue)
Chloride, 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.