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:
Jan. 04, 2011
Filed:
Sep. 12, 2008
Lawrence J. Karr, Santa Monica, CA (US);
Lawrence J. Karr, Santa Monica, CA (US);
RoundTrip LLC, Los Angeles, CA (US);
Abstract
A transmission sequence is broadcast from a locator to a group of transponder devices. Each transponder identified with the group is arranged to receive and capture at least a portion of the transmission, correlate the captured information with an internally stored reference sequence for the identified group, and identify a correlation when the captured information correlates with the internally stored reference sequence. Each transponder that finds a correlation is arranged to broadcast a transmission reply sequence at a precisely determined time interval so that the transponders in a group transmit at different times. A series of locators receive the transmission reply sequence(s), each at a precisely logged time of arrival, and the locators forward the received results to a central processing unit for time synchronization, location tracking, and inventory logging.