Granted Patent
Utility
US 6,175,307 · App. 08/819,769
Security system with audible link and two-way communication
Inventor:
John Peterson
Patented Case
View Patent ↗
Granted: Jan 16, 2001
Filed: Mar 18, 1997
Inventor
John Peterson
Assignee (at issue)
Digital Security Controls Ltd.
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.