This inventor holds 7 USPTO granted patents and 1 published patent application and 3 EPO patents. Top assignees: Vishay Measurements Group, Inc., Vishay Intertechnology, Inc., Vishay Precision Group, Inc.. Active years: 2006-2023.
Location History:
- Wake Forest, NC (US) (2006 - 2019)
- Raleigh, NC (US) (2023)
Company Filing History:
5 out of 5 
1 out of 46 
1 out of 1 Years Active: 2006-2023
Title: Thomas P. Kieffer: Innovator in Fatigue Life Sensing Technology
Introduction
Thomas P. Kieffer is a notable inventor based in Wake Forest, NC (US). He has made significant contributions to the field of engineering, particularly in the development of sensors for measuring fatigue life in structures. With a total of 7 patents to his name, Kieffer's work has had a profound impact on the industry.
Latest Patents
One of Kieffer's latest patents is a fatigue life sensor designed to measure repetitive loads applied to a structure. This innovative sensor includes a backing material secured to the structure and a foil that contains a conductive path. The conductive path has an initial resistance measured before the structure is subjected to repetitive loads. A crack initiation feature, in the form of a notch, is located on this conductive path. As repetitive loads are applied, cracks propagate from the initiation feature, increasing electrical resistance and allowing for the determination of the structure's fatigue progression.
Another significant patent is a resistance temperature detector (RTD) that features a medium temperature coefficient and high linearity. This RTD includes a temperature sensing circuit with a conductive element that receives an input signal and produces an output signal based on temperature. The conductive element is made from a metal with a temperature coefficient of resistance ranging from about 10 ppm/°F to about 1000 ppm/°F.
Career Highlights
Throughout his career, Kieffer has worked with prominent companies such as Vishay Measurements Group, Inc. and Vishay Precision Group, Inc. His experience in these organizations has contributed to his expertise in sensor technology and engineering.
Collaborations
Kieffer has collaborated with notable individuals in his field, including Robert Barry Watson and James I. Hardy. These collaborations have likely enriched his work and led to further innovations in sensor technology.
Conclusion
Thomas P. Kieffer is a distinguished inventor whose work in fatigue life sensing technology has made a significant impact on engineering practices. His innovative patents and collaborations reflect his dedication to advancing the field.