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. 30, 2005
Filed:
Sep. 18, 2001
Jeremy John Greenwood, Sutton Coldfield, GB;
Kevin Trevor Talbot, Lichfield, GB;
Christopher Richard Bottomley, Coventry, GB;
Jeremy John Greenwood, Sutton Coldfield, GB;
Kevin Trevor Talbot, Lichfield, GB;
Christopher Richard Bottomley, Coventry, GB;
Land Rover, Warwick, GB;
Abstract
A security system is disclosed which is suitable for use in a passive entry and passive starting arrangement for a vehicleA set of transmitters in the form of coils A, B, C are spaced around the vehicleone A, B in each door mirrorR,L and one in a high level brake lightat the rear end. Operation of a door handle initiates an access challenge from the vehiclewhich is sent out successively on a plurality of the coils A, B, C. A portable transpondercarried by an authorised user is adapted to pick up the challenge signal and send back to a security controllera response signal in which is included vector information relating to the relative positioning between the vehicleand the transponder