Company Filing History:
Years Active: 1980-1982
Title: Innovations in Circuit Protection by Donald F. Pettengill
Introduction
Donald F. Pettengill is a notable inventor based in Palo Alto, CA (US). He has made significant contributions to the field of circuit protection devices, holding a total of 2 patents. His work focuses on enhancing the safety and reliability of electrical circuits.
Latest Patents
Pettengill's latest patents include "Circuit protection devices comprising PTC elements" and "Circuits containing such devices." These devices are particularly useful in circuits carrying a steady state current of 0.5 amp or more. They protect the circuit against excessive current, which may result from a short circuit or voltage surge, as well as against excessive temperature. The PTC element is made from a conductive polymer with a resistivity of less than 10 ohm.cm during normal operation. The design includes electrodes that allow current to flow through the PTC element over a specified area, ensuring effective protection. When a fault condition occurs, the device generates heat, causing its temperature and resistance to rise, ultimately reaching a new stable thermal equilibrium state. This innovative approach ensures that the circuit current is reduced to a sufficiently low level, enhancing overall safety.
Career Highlights
Pettengill has had a distinguished career, contributing to advancements in electrical engineering and circuit design. His work at Raychem Limited has positioned him as a key figure in the development of circuit protection technologies.
Collaborations
Throughout his career, Pettengill has collaborated with notable colleagues, including Lee M. Middleman and Joseph H. Evans. These partnerships have fostered innovation and the sharing of ideas in the field of circuit protection.
Conclusion
Donald F. Pettengill's contributions to circuit protection devices have significantly impacted the safety and efficiency of electrical circuits. His innovative patents and collaborative efforts continue to influence the industry.