| US 7,573,386 B2 | ||
| System and method for smart radio frequency identification tags | ||
| Sandip Lahiri, Tampa, Fla. (US) | ||
| Assigned to International Business Machines Corporation, Armonk, N.Y. (US) | ||
| Filed on Aug. 19, 2004, as Appl. No. 10/922,248. | ||
| Prior Publication US 2006/0038684 A1, Feb. 23, 2006 | ||
| Int. Cl. G08B 13/14 (2006.01) | ||
| U.S. Cl. 340—572.1 [340/568.1; 340/10.1] | 7 Claims |
| 1. A method for implementing smart radio frequency identification (RFID) tags to detect an alteration of package contents
comprising the steps of:
establishing an initial package weight by establishing a relationship between package weight and a pressure on a package resulting
from package content weight;
recording this initial package weight at a RFID tag as a generated number;
detecting a change in the weight of the package contents from automatic and periodic submissions of presently existing current
measurements submitted from a logic device capable of measuring electrical current to the RFID tag and generating a signal
when a change in the pressure on the package resulting from the weight of the package contents is detected;
recording the change in the package weight at an RFID tag; and
transmitting the change in package weight to the RFID tag reader, by energizing the RFID tag and receiving the generated number
recorded in the RFID tag.
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