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. 05, 1997
Filed:
Oct. 13, 1993
David Naccache, Maison-Alfort, FR;
Patrice Fremanteau, Strasbourg, FR;
Wolfgang Hartnack, Burgdorf, DE;
Thomson Consumer Electronics S.A, Courbevoie, FR;
Abstract
Normally, speed control is carried out by police using radar and camera. The speed of a car can also be recorded in a tachograph. According to the invention car speed is controlled and/or limited using driver-specific smart-cards and millimeter wave communications. When a car (13) enters the sector of a new transmitter (11), its card reader receives a signal telling the reader to consider the time information (t.sub.1) received from the transmitter as a starting time. When the car exits this first sector and penetrates the perimeter of a second transmitter (12), the reader receives over the air a second time information (t.sub.2) and other information (v.sub.1, d.sub.1) from which the speed is calculated and recorded within the card reader. The police can check the recorded information by inserting a special card into the reader.