Post office box monitoring system

Details Post office box monitoring system Post office box monitoring system

1980-02-13

1982-02-02

Psitos, Aristotelis M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340569, H04M 1110, G08B 2100

Patent

active

043141021

ABSTRACT:
A system for detecting the presence of mail in a post office box. A post office box holder calls a telephone number which accesses a computer. The computer contains data representative of the presence or absence of letters in a plurality of post office boxes. If the box to which the caller refers is occupied, a series of tone pulses is transmitted to the caller by a tone generator under the direction of the computer.

REFERENCES:
patent: 2454088 (1948-11-01), Rapp
patent: 2465935 (1949-03-01), Scalia
patent: 2968804 (1961-01-01), Buffington
patent: 3426326 (1969-02-01), Goldstein
patent: 3792446 (1974-02-01), McFiggins et al.
patent: 3842208 (1974-10-01), Paraskevakos
patent: 3935994 (1976-02-01), Darvishian
patent: 4013838 (1977-03-01), Tsai
patent: 4064367 (1977-12-01), O'Malley

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