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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 4963887 B1

PDFFull Text
Date of Patent:
Oct. 16, 1990

Filed:

Aug. 29, 1989

Full duplex transponder system

Applicant:
Inventors:

Yoshikazu Kawashima, Kanagawa, JP;

Ko Ishikawa, Kanagawa, JP;

Shinichi Haruyama, Gunma, JP;

Fusao Sekiguchi, Tokyo, JP;

Assignees:

Yamatake-Honeywell Co., Ltd., Tokyo, JP;

Yokowo Mfg. Co., Ltd., Tokyo, JP;

Attorney:

Blakely, Sokoloff, Taylor & Zafman

Primary Examiner:

Thomas H Tarcza

Assistant Examiner:

Mark Hellner

Int. Cl.
CPC ...
H01R / ;
U.S. Cl.
CPC ...
342 44 ; 342 42 ;
Abstract

A full duplex transponder system includes an interrogation apparatus and a transponder apparatus. The transponder apparatus includes a reception antenna for receiving an interrogation signal wave whose carrier wave is phase- or frequency-modulated with an interrogation signal, a demodulator for demodulating the interrogation signal from the interrogation signal wave received by the antenna, a rectifier for rectifying the carrier wave of the interrogation signal wave received by the antenna and outputting a DC power used as a drive power source of the transponder apparatus, a multiplier for generating a predetermined harmonic component from the carrier wave of the interrogation signal wave received by the antenna, a modulator for amplitude-modulating the harmonic component with a response signal, and a transmission antenna for transmitting a response signal wave output from the modulator. The interrogation apparatus includes an oscillator for generating the carrier wave, a modulator for phase- or frequency-modulating the carrier wave generated by the oscillator with an interrogation signal, a transmission antenna for transmitting an interrogation signal wave output from the modulator, a reception antenna for receiving the response signal wave output from the transmission antenna of the transponder apparatus, and a demodulator for demodulating the response signal from the response signal wave received by the reception antenna.

Find Patent Forward Citations

Kawashima, Yoshikazu. (1990). Full duplex transponder system (U.S. Patent No. 4963887). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4963887

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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