Granted Patent
Utility
US 4,359,721 · App. 05/951,765
Two-wire multi-zone alarm system
Inventors:
Aaron A. Galvin, Roy Harvey
Patented Case
View Patent ↗
Granted: Nov 16, 1982
Filed: Oct 16, 1978
Inventors
Aaron A. Galvin
Roy Harvey
Assignee (at issue)
American District Telegraph Company
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.