Granted Patent
Utility
US 4,634,846 · App. 06/612,686
Multimode programmable stand-alone access control system
Inventors:
Roy Harvey, Douglas C. Mason
Patented Case
View Patent ↗
Granted: Jan 6, 1987
Filed: May 22, 1984
Inventors
Roy Harvey
Douglas C. Mason
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.