3m Innovative Properties Company

Jacob D Chatterton

Justin M Johnson

Donald R Battles

Robert D Lorentz

Lori-Ann S Prioleau

Steven J Perron

James C Vanous

Brinda B Badri

Ronald David Jesme

Robert A Sainati

Michael C Molinet

Badri Veeraraghavan

Zheng Huang

Terrence H Joyce

Andrew Bonifas

Swagata R Banerjee

Zhiguo Wen

Yingyu Wang

Sihua Yuan

Xuetao Yu

A system for monitoring temperature of an electrical conductor () enclosed in at least a (semi)conductive layer () comprising: a passive inductive unit (), and a transceiver unit () and a control unit (). The passive inductive unit () includes at least one temperature sensitive component and is configured to have a resonance frequency and/or Q value that vary with temperature of the electrical conductor (). The transceiver unit () is configured to be electromagnetically coupled to the passive inductive unit () and to send out a signal representing the resonance frequency and/or Q value of the passive inductive unit (). The transceiver unit () is further configured to communicate with the control unit () which ascertains the signal representing one or both of the resonance frequency and Q value, and which determines a value of the temperature of the electrical conductor () based on the ascertained signal representing one or both of the resonance frequency and Q value.

System for monitoring temperature of electrical conductor

A wetness sensor includes a substrate that carries a tuned RF circuit. The circuit includes a conductive pattern applied to the substrate, a capacitor, and a jumper all disposed on a same side of the substrate. The conductive pattern includes an inductive coil, and an inner and outer terminus. The jumper electrically couples the inner terminus to the outer terminus. The jumper also includes a frangible link which, when contacted by a target fluid, produces a drastic change in the operation of the RF circuit. The drastic change can be interpreted by a remote reader as a 'wet' condition. Contact of the frangible link by the target fluid may change the impedance or resistance of the RF circuit by at least a factor of 5, 10, 100, or more, and/or may cause the frangible link to disintegrate to produce an open circuit, and/or may substantially render the RF circuit inoperative.

Wetness sensor using RF circuit with frangible link

A wetness sensor includes a self-supporting substrate and an electrically conductive trace carried by the substrate. The trace is patterned to provide at least a portion of a tuned RF circuit, which may be disposed on only one side of the substrate and characterized by an impedance or resistance. The trace is not self-supporting. The substrate is adapted to dissolve, swell, or otherwise degrade when contacted by a target fluid. Such degradation produces a drastic change in the operation of the RF circuit, which can be interpreted by a remote reader as a 'wet' condition. Contact of the substrate by the target fluid may change the impedance or resistance of the RF circuit by at least a factor of 5, 10, 100, or 1000, and/or may cause the trace to disintegrate so as to provide the RF circuit with an open circuit, and/or may substantially render the RF circuit inoperative.

Wetness sensors

One exemplary electrically conductive, RFID-enabled signage includes (1) an electrically conductive article including an opening and (2) an assembled device that is coupled to the electrically conductive article to provide RFID functionality to the electrically conductive article. One exemplary kit includes (1) an RFID IC arrangement including conductive leads adjacent to an integrated circuit; (2) an insert attached to the RFID IC arrangement; and (3) an attachment device capable of attaching the RFID IC arrangement-insert combination to an electrically conductive signage such that the RFID IC arrangement is positioned to span at least a portion of an opening in the signage and to electrically couple the integrated circuit to the electrically conductive signage. One exemplary method involves providing an assembled device including and RFID IC arrangement and an insert and coupling the assembled device with an electrically conductive signage.

RFID packaging and attachment methods and devices

Growing community of inventors

Saint Paul, MN, United States of America

Jacob D Chatterton