John T Harvell

Title: The Innovations of John T Harvell: A Cryogenic Pioneer

Introduction

John T Harvell, a notable inventor based in Sudbury, MA, has made significant contributions to the field of cryogenics through his innovative designs. With a portfolio of five patents, he has established himself as a pivotal figure in the engineering community, particularly in the development of advanced cryopump technologies.

Latest Patents

One of Harvell's latest inventions is the Electronically Controlled Cryopump. This advanced cryogenic vacuum pump features an integral assembly with temperature sensors and heaters associated with the first and second stages of the cryopumping array. The design includes a roughing valve and a purge valve, while an electronic module is removably coupled to respond to sensors, controlling all operations of the cryopump, including regeneration. This module ensures system parameters are stored in nonvolatile memory, showcasing his commitment to improving the functionality and reliability of cryopump systems.

Another significant innovation by Harvell is the Cryopump with Improved Second Stage Passageway. This design strategically prevents condensation on the cryopump second stage refrigerator cylinder by creating an efficient passageway between a colder second stage cylinder shield and a warmer radiation shield. The innovative arrangement produces a significant temperature differential, thereby preventing condensation and ensuring consistent operational pressure variations.

Career Highlights

Harvell's career has been closely tied to Helix Technology Corporation, where he has developed various state-of-the-art technologies in the field of cryogenics. His contributions have helped the company maintain its competitive edge in an ever-evolving industry.

Collaborations

Throughout his career, John T Harvell has collaborated closely with colleagues Peter W Gaudet and Donald A Olsen. This teamwork has fostered a collaborative environment that has led to the production of groundbreaking innovations in cryogenic technology, demonstrating the power of collective creativity in problem-solving.

Conclusion

John T Harvell’s work exemplifies innovation and dedication in the field of cryogenics. His continuous efforts in improving cryopump technology not only demonstrate his inventive prowess but also contribute significantly to advancements in vacuum technology. His legacy as an inventor will undoubtedly inspire future generations in the field.