This inventor holds 43 USPTO granted patents and 5 published patent applications, plus 12 CIPO patents and 5 EPO patents, primarily in Touch Sensing Technology. Top assignees: Touchsensor Technologies, LLC, Alsentis, LLC, Donnelly Corporation. Active years: 1978-2025.
Location History:
- Plant City, FL (US) (1978)
- Winfield, IL (US) (2001)
- Naperville, IL (US) (2001 - 2006)
- Norwell, MA (US) (2014)
- Holland, MI (US) (1992 - 2023)
Company Filing History:
19 out of 57 
9 out of 9 
6 out of 912 
Years Active: 1978-2025
Areas of Expertise:
Title: David W. Caldwell: Innovator in Touch Input Technologies
Introduction: David W. Caldwell, based in Holland, MI, is a prolific inventor with a remarkable portfolio of 42 patents. His innovative work primarily focuses on touch input technologies, which have greatly influenced how users interact with electronic devices. Caldwell's contributions are characterized by their effectiveness in enhancing the performance and efficiency of capacitive sensors.
Latest Patents: Caldwell's latest patents revolve around "Simultaneous Time Domain Differential Sensing and Electric Field Sensing." These patents present systems and methods for determining touch input by measuring the peak voltage at an electrode over a specific measurement period. A significant aspect of his innovation is the ability to conserve computing resources by deferring digital signal processing until after the peak electrode capacitance has been sampled. The developed systems are suitable for a range of applications, including capacitive sensors utilizing both self-capacitance and mutual capacitance, as well as for capacitive buttons, track pads, and touch screens.
Career Highlights: Throughout his career, Caldwell has contributed to several notable companies, including Touchsensor Technologies, LLC, and Alsentis, LLC. His role in these organizations has allowed him to implement his cutting-edge designs and innovations in real-world applications, significantly improving user experiences with touch-sensitive devices.
Collaborations: Caldwell has had the opportunity to collaborate with esteemed colleagues such as Nicholas W. Medendorp and William David Schaefer. Through these partnerships, he has been able to enhance his inventions and expand the reach of his innovative solutions within the technology landscape.
Conclusion: David W. Caldwell's work in the field of touch input technologies exemplifies the spirit of innovation and the drive to enhance user interaction with electronic devices. His continued efforts and numerous patents signify a commitment to advancing technology and improving the overall user experience, making him a key figure in the world of modern inventions.