Information card system communicable in contactless manner

Details Information card system communicable in contactless manner Information card system communicable in contactless manner

1989-04-07

1991-05-14

Heckler, Thomas M.

Registers

Records

Magnetic

235449, G06K 708

Patent

active

050158341

ABSTRACT:
An information card system according to the present invention establishes a data communication between a terminal unit and an information card after receipt of an acknowledge signal supplied from the information card to the terminal unit, and the acknowledge signal is produced by a combination of a periodical signal retrieving circuit and an output unit incorporated in the information card upon receiving a periodical signal fed from the terminal unit, so that a misfit between the information card and the terminal unit is detectable before the data communication.

REFERENCES:
patent: 3641316 (1972-02-01), Dethloff et al.
patent: 4546241 (1985-10-01), Walton
patent: 4605844 (1986-08-01), Haggan
patent: 4605845 (1986-08-01), Takeda
patent: 4720626 (1988-01-01), Nishikawa et al.
patent: 4748320 (1988-05-01), Yorimoto et al.
patent: 4791285 (1988-12-01), Ohki
patent: 4795898 (1989-01-01), Bernstein et al.
patent: 4797541 (1989-01-01), Billings et al.
patent: 4798322 (1989-01-01), Bernstein et al.

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