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:
Sep. 15, 2009
Filed:
Sep. 23, 2004
Thomas G Xydis, Manitou Beach, MI (US);
Thomas G Xydis, Manitou Beach, MI (US);
Ensure Technologies, Inc., Ypsilanti, MI (US);
Abstract
A method allows access to an electronic device disposed in a working space by a user having a remote device is disclosed. An access point transmits an initial signal instructing the remote device to respond after a delay period, which responds upon the expiration of the delay period. A distance of the remote device is determined based upon a period interval from the transmission of the initial signal to the detection of a response signal and the known positions of the access point and the electronic device. Alternatively, a fixed device transmits locating signals detected by three access points, which measure a time differential. The position of the remote device is determined based upon a time of arrival, the location of each of the access points, and the time differential. The electronic device is enabled when the remote device is within the predetermined distance range.