The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 15, 1979
Filed:
Aug. 26, 1977
Applicant:
Inventors:
Bryan D Ulch, Valencia, CA (US);
Sarkis V Kalustian, North Hollywood, CA (US);
Assignee:
A-T-O Inc., Willoughby, OH (US);
Primary Examiner:
Int. Cl.
CPC ...
H04Q / ; G08B / ;
U.S. Cl.
CPC ...
3401 / ; 340505 ;
Abstract
A line monitoring system is disclosed which provides particular advantages to security systems having remote terminals. This system provides both a reduction in the required power for the line monitoring task and also increases the level of line security by generating a calculated response at the remote terminal, which calculated response could not be accidentally produced by a faulty remote unit. Futhermore, the calculated response at the remote unit greatly reduces the likelihood of clandestine entry at the remote site.