Flexible piezocapacitive and piezoresistive force and pressure sensors

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 8904876
APP PUB NO 20140090488A1
SERIAL NO

13631981

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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Flexible force/pressure sensors for producing electrical output signals proportional to forces or pressures exerted on the sensor include a thin, elastically deformable foam pad laminated between a pair of electrically conducive fabric sheets. A piezocapacitive embodiment of the sensor utilizes an elastically deformable perforated open-cell polyurethane foam pad preferably saturated with glycerin to increase the capacitance of the sensor. The piezocapacitive sensor section is preferably stacked onto a piezoresistive section having a second open-cell foam pad containing piezoresistive carbon particles to form a hybrid piezocapacitive/piezoresistive sensor. A third, “leaky dielectric” embodiment of a sensor includes a single open-cell foam pad which contains both a dielectric liquid and conductive particles. A low frequency such as d.c. to a few hertz is applied to a sensor to determine piezoresistive response of the sensor to forces or pressures and a higher frequency such as 30 KHz is applied to determine piezocapactive response.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
PATIENTECH LLCMORNINGVIEW, KY12

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chapin, William L Huntington Beach, US 3 39
Taylor, Geoffrey L Winnipeg, CA 24 711

Cited Art Landscape

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Patent Citation Ranking

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