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US 4,195,288 AGranted
Alarm system
OwnerHenry H. Mortoninventor
Life of this patent
Estimating the term…
Abstract
An alarm device and system which is adaptable to a variety of uses and conditions for protecting homes, equipment, buildings and the like by alerting or informing distant or nearby personnel to changes of conditions from within predetermined limits.
Claims11
An alarm device comprising:
- a protective loop, said loop including a coded module and a pair of conductors joined to said coded module, said conductors connected to normally opened and normally closed sensing means, a multi-functional alarm control means connected to said conductors, said multi-functional alarm control means containing an analyzer circuit for discriminating between normally open or normally closed violations and having high voltage and radio frequency input protection, said coded module and said analyzer circuit cooperating to prevent defeat of said sensing means.
An alarm device as claimed in claim 12 wherein said key switch cooperates with said multi-functional alarm control means for disarming the control device by coded switching procedures.
Dependencies are inferred from the claim text.