Vandal proof intercom system for apartment buildings

Details Vandal proof intercom system for apartment buildings Vandal proof intercom system for apartment buildings

2006-09-26

2006-09-26

Taylor, Barry (Department: 2617)

Telephonic communications

Private or single line system

C379S167110

Reexamination Certificate

active

07113578

ABSTRACT:
An electronic apartment station intercom unit, housed in a vandal proof enclosure, providing a means for a tenant to communicate with apartment building main entrance door panel and means to unlock said door. This unit has a power storage unit that enables this unit to be compatible with existing apartment building switching units. This power storage unit can be in the form of capacitors. In addition, this unit also contains a timer to shut the intercom unit off after a preset period of time.

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patent: 5497533 (1996-03-01), Karlsen
patent: 5966432 (1999-10-01), Buckler et al.

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