Door station apparatus with electric lock

Details Door station apparatus with electric lock Door station apparatus with electric lock

2006-10-31

2006-10-31

Holloway, III, Edwin C. (Department: 2612)

Communications: electrical

Systems

Selsyn type

C340S538110, C340S005100, C379S102060

Reexamination Certificate

active

07129820

ABSTRACT:
The respective sections between a power source unit4and a room master station1, between the room master station1and an entrance door station2, and between the entrance door station2and an electric lock3are connected by transmission lines of two-wire system6for transmitting signals and electric power.

REFERENCES:
patent: 3978468 (1976-08-01), Bond et al.
patent: 4524384 (1985-06-01), Lefkowitz et al.
patent: 5228078 (1993-07-01), Bitzmann
patent: 5475741 (1995-12-01), Davis et al.
patent: 2002/0030583 (2002-03-01), Jang et al.
patent: 37 10 091 (1988-10-01), None
patent: 0 579 345 (1994-01-01), None
patent: 0 818 914 (1998-01-01), None

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