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. 28, 2007
Filed:
Oct. 20, 2004
Jeffrey Zhu, Richmond Hill, CA;
Wai-cheung Tang, Mannheim, CA;
Jeffrey Zhu, Richmond Hill, CA;
Wai-Cheung Tang, Mannheim, CA;
Mark IV Industries Corp., Ontario, CA;
Abstract
An external indicator for use in proximity to an on-board unit or transponder for an electronic toll collection (ETC) system. The external indicator senses RF transmissions from the on-board unit and/or roadside readers of the ETC system and produces sensory outputs when transmissions are detected. The external indicator receives RF signals, demodulates them, and analyses the demodulated RF signals to determine if it has received a roadside reader trigger signal and/or a transponder response signal. A sensory indicator, such as a visual, auditory, or kinetic device, alerts an occupant of a vehicle to the detected RF transmissions and, accordingly, to the likely occurrence of an ETC transaction.