Inventor · disambiguated record
David W. Caldwell
Also filed as: CALDWELL DAVID · CALDWELL DAVID W · CALDWELL DAVID WAYNE · CALDWELL II DAVID W
53 granted patents·6 pending applications·5,519 citations·filing 1976–2023
99Inventor score
Files withTOUCHSENSOR TECH LLC16ALSENTIS LLC10CALDWELL DAVID W6DONNELLY CORP6MAT HANDLING SYSTEMS INC5
Top patents by PatentIndex Score
59 records- 0199US7098414B2Integrated touch sensor and light apparatusTOUCHSENSOR TECH LLC·Filed 2004·Granted Aug 29, 2006·121 cites·32 claims
- 0299US6320282B1Touch switch with integral control circuitTOUCHSENSOR TECH LLC·Filed 1999·Granted Nov 20, 2001·937 cites·5 claims
- 0399US6310611B1Differential touch sensor and control circuit thereforTOUCHSENSOR TECH LLC·Filed 1997·Granted Oct 30, 2001·1k cites·84 claims
- 0499US5239152ATouch sensor panel with hidden graphic modeDONNELLY CORP·Filed 1990·Granted Aug 24, 1993·432 cites·22 claims
- 0598USRE42199EIntegrated touch sensor and light apparatusTOUCHSENSOR TECH LLC·Filed 2008·Granted Mar 8, 2011·57 cites·32 claims
- 0698US7030513B2Touch switch with integral control circuitTOUCHSENSOR TECH LLC·Filed 2003·Granted Apr 18, 2006·96 cites·16 claims
- 0798US6713897B2Touch switch with integral control circuitTOUCHSENSOR TECH LLC·Filed 2001·Granted Mar 30, 2004·121 cites·12 claims
- 0898US5572205ATouch control systemDONNELLY TECHNOLOGY INC·Filed 1993·Granted Nov 5, 1996·244 cites·60 claims
- 0997US7361860B2Integrated touch sensor and light apparatusTOUCHSENSOR TECH LLC·Filed 2002·Granted Apr 22, 2008·74 cites·20 claims
- 1097US6897390B2Molded/integrated touch switch/control panel assembly and method for making sameTOUCHSENSOR TECH LLC·Filed 2002·Granted May 24, 2005·167 cites·52 claims
- 1197US5594222ATouch sensor and control circuit thereforINTEGRATED CONTROLS·Filed 1994·Granted Jan 14, 1997·913 cites·32 claims
- 1296US8135482B2Intelligent shelving systemCALDWELL DAVID W·Filed 2010·Granted Mar 13, 2012·55 cites·14 claims
- 1396US7260438B2Intelligent shelving systemTOUCHSENSOR TECH LLC·Filed 2002·Granted Aug 21, 2007·70 cites·15 claims
- 1496US7242393B2Touch sensor with integrated decorationTOUCHSENSOR TECH LLC·Filed 2002·Granted Jul 10, 2007·84 cites·20 claims
- 1596US5189417ADetection circuit for matrix touch padDONNELLY CORP·Filed 1990·Granted Feb 23, 1993·116 cites·24 claims
- 1695US10994309B2System and method for identifying and transferring parcels from a first conveyor to a second conveyorMAT HANDLING SYSTEMS INC·Filed 2020·Granted May 4, 2021·10 cites·17 claims
- 1795US7840286B2Intelligent shelving systemTOUCHSENSOR TECH LLC·Filed 2006·Granted Nov 23, 2010·41 cites·21 claims
- 1895US5867111ATouch control systemDONNELLY TECHNOLOGY INC·Filed 1996·Granted Feb 2, 1999·107 cites·30 claims
- 1994US11241802B2Dual-material vacuum cup for a vacuum-based end effectorMAT HANDLING SYSTEMS INC·Filed 2020·Granted Feb 8, 2022·6 cites·18 claims
- 2094US10646898B2System and method for identifying and transferring parcels from a first conveyor to a second conveyorMAT HANDLING SYSTEMS INC·Filed 2018·Granted May 12, 2020·31 cites·20 claims
- 2192US5289365AModular network control systemDONNELLY CORP·Filed 1991·Granted Feb 22, 1994·187 cites·31 claims
- 2290US7218498B2Touch switch with integral control circuitTOUCHSENSOR TECH LLC·Filed 2002·Granted May 15, 2007·57 cites·66 claims
- 2390US7175304B2Integrated low profile displayTOUCHSENSOR TECH LLC·Filed 2004·Granted Feb 13, 2007·60 cites·58 claims
- 2490US6944018B2Control system input apparatus and methodTOUCHSENSOR TECH LLC·Filed 2002·Granted Sep 13, 2005·62 cites·6 claims
- 2589US8831175B2Hybrid X-ray optic apparatus and methodsSILVER ERIC H·Filed 2011·Granted Sep 9, 2014·30 cites·20 claims
- 2688US11578386B2Metal refinementENVIRO METALS LLC·Filed 2022·Granted Feb 14, 2023·1 cites·6 claims
- 2787US7906875B2Touch switches and practical applications thereforTOUCHSENSOR TECH LLC·Filed 2005·Granted Mar 15, 2011·17 cites·29 claims
- 2886US11319613B2Metal refinementENVIRO METALS LLC·Filed 2021·Granted May 3, 2022·1 cites·16 claims
- 2986US5164609AControllable power distribution systemDONNELLY CORP·Filed 1990·Granted Nov 17, 1992·118 cites·22 claims
- 3085US9437786B2Light emitting device for illuminating plantsVENNTIS TECH LLC·Filed 2015·Granted Sep 6, 2016·5 cites·20 claims
- 3185US5157273AModular power outlet stripDONNELLY CORP·Filed 1990·Granted Oct 20, 1992·66 cites·15 claims
- 3284US9184350B2Light emitting device for illuminating plantsVenntis Technologies LLC·Filed 2014·Granted Nov 10, 2015·5 cites·22 claims
- 3383US12429985B2Simultaneous time domain differential sensing and electric field sensingALSENTIS LLC·Filed 2023·Granted Sep 30, 2025·0 cites·18 claims
- 3482US5153572ATouch-sensitive control circuitDONNELLY CORP·Filed 1990·Granted Oct 6, 1992·93 cites·12 claims
- 3581US9851834B2Time domain differential techniques to characterize various stimuliALSENTIS LLC·Filed 2014·Granted Dec 26, 2017·6 cites·20 claims
- 3681US2023175098A1Metal refinementENVIRO METALS LLC·Filed 2023·Application pending·0 cites
- 3780US9182098B2Device for scattering lightVenntis Technologies LLC·Filed 2013·Granted Nov 10, 2015·6 cites·19 claims
- 3880US9041286B2Volumetric light emitting deviceVenntis Technologies LLC·Filed 2014·Granted May 26, 2015·4 cites·17 claims
- 3976US11524403B2Vacuum-based end effector for engaging parcelsMAT HANDLING SYSTEMS INC·Filed 2020·Granted Dec 13, 2022·1 cites·18 claims
- 4074US8866497B2Apparatus and method for determining a touch inputCALDWELL DAVID W·Filed 2010·Granted Oct 21, 2014·4 cites·30 claims
- 4172US11730910B2Simultaneous time domain differential sensing and electric field sensingALSENTIS LLC·Filed 2021·Granted Aug 22, 2023·0 cites·20 claims
- 4272US9306561B2Touch switches and practical applications thereforCALDWELL DAVID W·Filed 2012·Granted Apr 5, 2016·3 cites·24 claims
- 4371US11592943B2Simultaneous time domain differential sensing and electric field sensingALSENTIS LLC·Filed 2021·Granted Feb 28, 2023·0 cites·17 claims
- 4471US11592942B2Simultaneous time domain differential sensing and electric field sensingALSENTIS LLC·Filed 2021·Granted Feb 28, 2023·0 cites·21 claims
- 4568US4780619AHigh DC voltage power supply for motor vehicle electrical systemGEN MOTORS CORP·Filed 1987·Granted Oct 25, 1988·42 cites·15 claims
- 4667US8227940B2Touch switches and practical applications thereforCALDWELL DAVID W·Filed 2011·Granted Jul 24, 2012·2 cites·16 claims
- 4766US7532131B2Multi-layer solid state keyboardSCHAEFER WILLIAM DAVID·Filed 2004·Granted May 12, 2009·15 cites·30 claims
- 4860US10248264B2Apparatus and method for determining a stimulus, including a touch input and a stylus inputALSENTIS LLC·Filed 2013·Granted Apr 2, 2019·1 cites·8 claims
- 4955US8307549B2Method of making an electrical circuitCALDWELL DAVID W·Filed 2004·Granted Nov 13, 2012·4 cites·26 claims
- 5053US10185439B2Time domain differential techniques to characterize various stimuliALSENTIS LLC·Filed 2017·Granted Jan 22, 2019·0 cites·14 claims
Showing the top 50 of 59 patent records by PatentIndex Score.
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