Mail signal system

Details Mail signal system Mail signal system

1986-05-14

1988-12-27

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

232 37, 340527, 340539, 340693, G08B 2100

Patent

active

047943777

ABSTRACT:
A signal to indicate deposit of mail in a box remote from a residence employs an optical reflective detector which senses presence of mail in the box. The transmission may be r. f. if the box is relatively isolated from other boxes. In apartments, condominiums, and the like where multiple boxes are centrally located, transmission may be by special wiring or by imposing a coded signal on house electrical wiring. Means is provided for the detector distinguishing between outgoing mail deposited in the box and new incoming mail.

REFERENCES:
patent: 3614734 (1971-10-01), Davis
patent: 3909819 (1975-09-01), Radford
patent: 4198563 (1980-04-01), Elssner
patent: 4458146 (1984-07-01), Reiner et al.
patent: 4520350 (1985-05-01), Huang
patent: 4633236 (1986-12-01), Buhl

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