Abuse resistant doorbells

Details Abuse resistant doorbells Abuse resistant doorbells

2005-11-15

2005-11-15

Wu, Daniel (Department: 2632)

Communications: electrical

Systems

Timer control

C340S384710

Reexamination Certificate

active

06965301

ABSTRACT:
Protection against abusive ringing of doorbells is provided by a ring limiting circuit including ring counter and ring timer circuits.

REFERENCES:
patent: 4868540 (1989-09-01), Housley
patent: 5210520 (1993-05-01), Housley
patent: 5774039 (1998-06-01), Housley

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