Granted Patent
Utility
US 4,491,828 · App. 06/414,431
Two-wire multi-zone alarm system
Inventors:
Aaron A. Galvin, Roy Harvey
Patented Case
View Patent ↗
Granted: Jan 1, 1985
Filed: Sep 2, 1982
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.