Portable radio frequency emitting identifier

Details Portable radio frequency emitting identifier Portable radio frequency emitting identifier

1980-12-31

1983-05-17

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

235380, 34082564, H04B 100, G08B 310

Patent

active

043842887

ABSTRACT:
An automatic identification system wherein a portable identifier, preferably shaped like a credit card, incorporates an oscillator and encoder so as to generate a programmable pulse position-modulated signal in the radio frequency range for identification of the user. The identifier can be made to generate the identification signal constantly or can be made for stimulated transmission responsive to an interrogation signal. The identification signal can be preset or can be programmable by use of a programmable memory.

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IBM Technical Disclosure Bulletin, vol. 2, No. 7, Dec. 1977, p. 2525, "Externally Powered Semiconductor Transponder", B. C. Dillon et al.

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