US 7,321,296 B2 | ||
Electronic locating systems | ||
Thomas J. Engellenner, 11 Birch Hill Rd., Newton, Mass. 02465 (US) | ||
Assigned to Thomas J. Engellenner, Newton, Mass. (US) | ||
Filed on May 09, 2005, as Appl. No. 11/124,844. | ||
Application 11/124844 is a continuation of application No. 10/145516, filed on May 14, 2002, granted, now 6,891,469. | ||
Application 10/145516 is a continuation of application No. 09/562247, filed on May 02, 2000, granted, now 6,388,569. | ||
Application 09/562247 is a continuation of application No. 09/134790, filed on Aug. 14, 1998, granted, now 6,057,756. | ||
Application 09/134790 is a continuation of application No. 08/478866, filed on Jun. 07, 1995, granted, now 5,798,693. | ||
Prior Publication US 2005/0206523 A1, Sep. 22, 2005 | ||
Int. Cl. G08B 26/00 (2006.01) |
U.S. Cl. 340—505 [235/385; 340/10.31; 340/10.33; 340/825.49; 705/28] | 7 Claims |
1. A method of tracking the distribution of items comprising the steps of:
coding each item to be distributed with a tag responsive to a predetermined electromagnetic signal, said coded tag providing
an identification of the item;
creating an initial interrogation region at an exit passageway from an initial location such that uncoded or improperly coded
tags are detected before distribution;
interrogating a spatial region at a destination location with said electromagnetic signal to cause the tag to generate a responsive
signal if present at the destination location;
detecting said responsive signal to confirm the tagged item's presence; and
updating an inventory of items at the destination location to include the responsive tagged item.
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