Credit card which generates a DTMF tone

Details Credit card which generates a DTMF tone Credit card which generates a DTMF tone

1995-10-13

1996-07-23

Hofsass, Jeffery

Telephonic communications

Supervisory or control line signaling

Substation originated

379354, 379357, 379413, H04M 126

Patent

active

055398197

ABSTRACT:
A credit card capable of automatic dialing by generating DTMF signals. The credit card is comprised of two thin plastic boards 2 and 3 adhering to each other. The plastic board 2 includes a magnetic stripe 11, while the plastic board 3 includes a solar power battery 21, paper speaker (SP) 22, dial selection key 23 and a circuit board 25. When the dial selection key 23 is pressed, the DTMF signals are generated based on the corresponding telephone number, and outputted from the SP 22. Desired telephone numbers inputted by a user can be stored by using EEPROM 102, four buttons 101 and dial selection buttons 23.

REFERENCES:
patent: 4817135 (1989-03-01), Winebaum
patent: 4868849 (1989-09-01), Tamaoki
patent: 4980910 (1990-12-01), Oba et al.
patent: 4995077 (1991-02-01), Malinowski
patent: 5181744 (1993-01-01), Betheil
patent: 5343519 (1994-08-01), Feldman

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