Method of allowing access to an electronic device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 15, 2009
Grant Date -
Feb 24, 2005
app pub date -
Sep 23, 2004
filing date -
Nov 29, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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