Registers – Records – Conductive
Patent
1986-11-20
1989-04-18
Leung, Philip H.
Registers
Records
Conductive
235380, 34082531, 34082532, G06K 1900
Patent
active
048229903
ABSTRACT:
An admission control system including a portable medium which is equipped with a transponder that is actuated and powered by an inquiry radio wave and sends out an identifying code signal as a radio wave, a transmission device which is provided at a gateway to a place to which admittance is to be gained by only specific persons, and at the gateways to specific areas within the place, and so on, the transmission device transmits an inquiry radio wave, upon detecting the passage of the gateway by a person who carries the portable medium. The admission control system receives an identifying code signal from the portable medium that is transmitted in response to the inquiry radio wave, admits the bearer of the portable medium card to the place only when the identifying code coincides with the identifying code at the gate, and confirms the position of the person within the place.
REFERENCES:
patent: 3652827 (1972-03-01), Inoue et al.
patent: 3701100 (1972-10-01), Yarbrough
patent: 4006459 (1977-02-01), Baker et al.
patent: 4338601 (1982-07-01), Nance-Kivell
patent: 4378551 (1983-03-01), Drapac
patent: 4384288 (1983-05-01), Walton
patent: 4692762 (1987-09-01), Lewiner et al.
Matsuoka Hideo
Tamada Masuo
Tanaka Tsutomu
Kabushiki Kaisha Toshiba
Leung Philip H.
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