Integrated telephone intercommunication and alarm electronic con

Details Integrated telephone intercommunication and alarm electronic con Integrated telephone intercommunication and alarm electronic con

1998-04-22

2000-06-20

Loomis, Paul

Telephonic communications

Private or single line system

Doorbell system

379162, 379374, H04M 100, H04M 900

Patent

active

060786531

ABSTRACT:
A telecommunication and alarm system for connection to: a four-wire or two-wire telephone network, a two-terminal doorphone unit, and one or more alarm detectors connected in parallel
COMPRISING

REFERENCES:
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patent: 5594788 (1997-01-01), Lin et al.
patent: 5640448 (1997-06-01), Toyoshima
patent: 5764746 (1998-06-01), Reichelt
patent: 5774039 (1998-06-01), Housley
patent: 5887054 (1999-03-01), Burke et al.
patent: 5912958 (1999-06-01), Eyran et al.
patent: 5915014 (1999-06-01), Kakizawa
patent: 5920616 (1999-07-01), Hazenfield

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