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. 25, 2009
Filed:
Mar. 14, 2005
Applicants:
Curtis Lee Carrender, Morgan Hill, CA (US);
John M. Price, Morgan Hill, CA (US);
Inventors:
Curtis Lee Carrender, Morgan Hill, CA (US);
John M. Price, Morgan Hill, CA (US);
Assignee:
Alien Technology Corporation, Morgan Hill, CA (US);
Primary Examiner:
Int. Cl.
CPC ...
H04B 7/005 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method and system for locating an RF transponder based on phase differences between signals received from the RF transponder. The method includes receiving a signal from the transponder and calculating distance, relative movement, and position by comparing I-Q phase angle vectors of the signals. Global scroll commands can be used following receipt of signals at first and second frequencies to quickly determine distance.