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:
Aug. 10, 2004
Filed:
May. 29, 2002
Yoshihiko Tanji, Osaka, JP;
Satoru Handa, Nara, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A reflection multiplier radio wave marker system which comprises a plurality of transmit antennas mounted on board a vehicle for transmitting electric wave signals in a first frequency; a reflection multiplier radio wave marker installed in the surface of a road, which reflects and transmits the electric wave signal of first frequency after multiplying it into an electric wave signal of a second frequency; and a receive antenna mounted on board the vehicle for receiving the electric wave of second frequency. The system specifies the location of a vehicle in a traffic lane by making use of the second frequency electric wave signal reached from a marker. It can detect a marker throughout substantially the entire width range of a vehicle. A traffic system using the marker system is also disclosed. The function of specifying the location of a radio wave marker is performed throughout the entire vehicle width.