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:
Apr. 22, 2003
Filed:
Aug. 02, 1999
Applicant:
Inventors:
Alan Henry Jones, Cambridge, GB;
Andrew Martin Robert Ward, Cambridge, GB;
Assignee:
AT&T Laboratories, Cambridge Limited, Cambridge, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04Q 7/00 ;
U.S. Cl.
CPC ...
H04Q 7/00 ;
Abstract
A system which enables the position of each plurality of mobile labelled objects in a specified environment to be determined from the transit times to fixed receivers of ultrasound energy transmitted by object mounted transponders which are triggered by radio energy, wherein the specified environment is divided into cells each have a radio transmitter transmitting the radio triggered signals, these radio transmissions being multiplexed in accordance with identifying characteristics of the respective cells, no two cells with the same identifying characteristics overlapping one another.