Granted Patent
Utility
US 4,199,754 · App. 05/853,468
Circuit for an emergency lighting and fire detector system
Inventors:
Robert W. Johnson, William J. Raddi
Patented Case
View Patent ↗
Granted: Apr 22, 1980
Filed: Nov 21, 1977
Inventors
Robert W. Johnson
William J. Raddi
Assignee (at issue)
ESB Incorporated
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.