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:
Nov. 27, 2012
Filed:
Feb. 28, 2007
Tarun Kumar Bhattacharya, San Jose, CA (US);
Martin Feuerstein, Redmond, WA (US);
Scot Douglas Gordon, Bothell, WA (US);
Tarun Kumar Bhattacharya, San Jose, CA (US);
Martin Feuerstein, Redmond, WA (US);
Scot Douglas Gordon, Bothell, WA (US);
Polaris Wireless, Inc., Santa Clara, CA (US);
Abstract
A method for estimating whether or not a wireless terminal is in a zone is described. The method is based on the following observation: when a wireless terminal is at a particular location, the values of the traits of the ambient electromagnetic signals that vary with location represent a 'fingerprint' or 'signature' for that location. This enables the location of a wireless terminal to be estimated by comparing the observed values of the traits of the ambient electromagnetic signals with the fingerprint for each potential location for the wireless terminal.