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.:
Date of Patent:
Mar. 18, 2003
Filed:
Nov. 19, 1999
Yukihiko Miyamoto, Tama, JP;
Yoshinori Morimoto, Ebina, JP;
Kabushiki Kaisha Kenwood, Tokyo, JP;
Abstract
A transponder is selectively mounted on a vehicle. The transponder receives its operation energy through magnetic coupling with the loop coil when the vehicle comes over the loop coil, and transmits predetermined information specific to the vehicle to the vehicle detection circuit. The vehicle detection circuit time divisional performs a supply of the operation energy to the transponder and a reception of the information from the transponder, detects a presence of a vehicle in accordance with a change in the output from the loop coil, and judges from the information received from the transponder whether the detected vehicle is a predetermined vehicle.