Method and apparatus for determining when a door has opened

Details Method and apparatus for determining when a door has opened Method and apparatus for determining when a door has opened

2005-08-09

2005-08-09

Font, Frank G. (Department: 2883)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S686200, C385S147000

Reexamination Certificate

active

06927690

ABSTRACT:
An apparatus for determining when a door connected to a wall has opened. The apparatus includes a mechanism for transmitting an optical signal from a first point to a second point. The apparatus includes a mechanism for interrupting the signal from reaching the second point from the first point when the door is open. The interrupting mechanism contacting the transmitting means. A method for determining when a door has opened. An apparatus for interrupting an optical signal transmitted from a first point to a second point through a first fiber and at least a second fiber when a door is opened.

REFERENCES:
patent: 4812810 (1989-03-01), Query et al.
patent: 5870518 (1999-02-01), Haake et al.

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