Registers – Systems controlled by data bearing records – Credit or identification card systems
Patent
1986-04-08
1989-07-04
Pitts, Harold I.
Registers
Systems controlled by data bearing records
Credit or identification card systems
235442, G01F 500
Patent
active
048453471
ABSTRACT:
A transaction system enables a portable token to co-operate with a fixed terminal. The token is inductively coupled to the terminal, and receives data from the terminal via a frequency modulated carrier signal. Data is sent from the token to the terminal by amplitude modulation of the carrier signal from the terminal, i.e. by modulating the power driven by the token from the terminal. The power needed to energize the on-board processing capability of the token is also obtained from the terminal via the inductive coupling. The token includes an arrangement for commencing processor operation in an orderly manner when it is brought into the proximity of the terminal, and for providing an orderly shut down when the token is withdrawn.
REFERENCES:
patent: 3906460 (1975-05-01), Halpern
patent: 4298793 (1981-11-01), Melis
patent: 4388524 (1983-06-01), Walton
patent: 4459474 (1984-07-01), Walton
patent: 4701601 (1987-10-01), Francini
Jackson Andrew M.
McCrindle John A.
Steiner Antony F.
Pitts Harold I.
The General Electric Company p.l.c.
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