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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.

Patents per Year

Issued Patents All Time

Showing 1–25 of 52 patents

Patent #	Title	Co-Inventors	Date	Approx 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