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USPTO Patent Rankings Data through Dec 31, 2025
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David W. Caldwell — 52 Patents

TTTouchsensor Technologies: 19 patents #1 of 38Top 3%
ALAlsentis: 9 patents #1 of 4Top 25%
DODonnelly: 6 patents #82 of 274Top 30%
MSMaterial Handling Systems: 5 patents #4 of 31Top 15%
DTDonnelly Technology: 2 patents #6 of 10Top 60%
General Motors: 2 patents #6,303 of 18,328Top 35%
STSteelcase: 1 patents #504 of 809Top 65%
Holland, MI: #22 of 1,299 inventorsTop 2%
Michigan: #872 of 86,293 inventorsTop 2%
Overall (All Time): #50,240 of 4,157,543Top 2%
52 Patents All Time
David W. Caldwell has been granted 52 US patents while listed as an inventor at Touchsensor Technologies. The first was granted in 1988 and the most recent in September 2025. David W. Caldwell ranks #50,240 of 4,157,543 US inventors in our database (top 1.2%). Patent records list David W. Caldwell in Holland, MI, US.

Issued Patents All Time

Showing 1–25 of 52 patents

Patent #TitleCo-InventorsDateApprox Value ⓘ
12429985 Simultaneous time domain differential sensing and electric field sensing — 2025-09-30
11730910 Simultaneous time domain differential sensing and electric field sensing — 2023-08-22
11592942 Simultaneous time domain differential sensing and electric field sensing — 2023-02-28
11592943 Simultaneous time domain differential sensing and electric field sensing — 2023-02-28
11578386 Metal refinement — 2023-02-14
11561652 Simultaneous time domain differential sensing and electric field sensing — 2023-01-24
11524403 Vacuum-based end effector for engaging parcels Josiah Douglas, Kurt Michael Wittmer, Michael Alan McCue, Gregory Robert Sturm, Derek Robert Sturm +1 more 2022-12-13
11319613 Metal refinement — 2022-05-03
11241802 Dual-material vacuum cup for a vacuum-based end effector Josiah Douglas, Derek Robert Sturm 2022-02-08
11192145 Singulating system for parcels Gregory Robert Sturm, Jonathan Dean Terrell, Thomas A. Hillerich, Michael Alan McCue, Derek Robert Sturm 2021-12-07
10994309 System and method for identifying and transferring parcels from a first conveyor to a second conveyor Thomas A. Hillerich, Michael Alan McCue, Gregory Robert Sturm, Derek Robert Sturm 2021-05-04
10646898 System and method for identifying and transferring parcels from a first conveyor to a second conveyor Thomas A. Hillerich, Michael Alan McCue, Gregory Robert Sturm, Derek Robert Sturm 2020-05-12
10248264 Apparatus and method for determining a stimulus, including a touch input and a stylus input William D. Schaefer, Robert G. Bos, Stefan G. Kurek 2019-04-02
10185439 Time domain differential techniques to characterize various stimuli Robert G. Bos, Stefan G. Kurek 2019-01-22
9851834 Time domain differential techniques to characterize various stimuli Robert G. Bos, Stefan G. Kurek 2017-12-26
9437786 Light emitting device for illuminating plants Jeffrey L. Mastin, Daniel J. Fisher, Jamie C. Caldwell, William D. Schaefer, Justin T. Teitt 2016-09-06
9306561 Touch switches and practical applications therefor Rick L. Oppor, Anthony V. Gioiosa, Robert B. Campbell, Thomas M. Schreiber, Bahar N. Wadia +3 more 2016-04-05
9182098 Device for scattering light Justin T. Teitt 2015-11-10
9184350 Light emitting device for illuminating plants Jeffrey L. Mastin, William D. Schaefer, Daniel J. Fisher, Jamie C. Caldwell, Justin T. Teitt 2015-11-10
9041286 Volumetric light emitting device Daniel J. Fisher, Justin T. Teitt, Jamie C. Caldwell, William D. Schaefer 2015-05-26
8866497 Apparatus and method for determining a touch input William D. Schaefer 2014-10-21
8831175 Hybrid X-ray optic apparatus and methods Eric H. Silver, Gerald Austin, Ting-Kuan Lin 2014-09-09
8307549 Method of making an electrical circuit Michael J. Taylor, Michael Marshall 2012-11-13
8227940 Touch switches and practical applications therefor Rick L. Oppor, Anthony V. Gioiosa, Robert B. Campbell, Thomas M. Schreiber, Bahar N. Wadia +3 more 2012-07-24
8135482 Intelligent shelving system Thomas M. Schreiber, Bahar N. Wadia, Donald Charles Mueller 2012-03-13

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