Wetness sensors

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 9681996
SERIAL NO

13207522

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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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.

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Patent Owner(s)

  • 3M INNOVATIVE PROPERTIES COMPANY

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Badri, Brinda B Woodbury, US 11 255
Battles, Donald R Arden Hills, US 19 553
Chatterton, Jacob D St. Paul, US 6 262
Johnson, Justin M Oakdale, US 49 388
Lorentz, Robert D North Oaks, US 22 579
Perron, Steven J St. Paul, US 20 332
Prioleau, Lori-Ann S St. Paul, US 20 320
Vanous, James C Roseville, US 12 255
Veeraraghavan, Badri Woodbury, US 33 441

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