Company Filing History:
5 out of 99 
2 out of 128 
1 out of 4 Years Active: 1976-1996
Title: John K. Litchfield: A Pioneer in Composite Materials and Thermal Battery Innovations
Introduction
John K. Litchfield is an accomplished inventor based in Bedford, MA, whose extensive work has resulted in nine patents. His innovative contributions primarily focus on advancements in composite materials and thermal battery technologies, demonstrating his profound impact on these fields.
Latest Patents
Among his latest patents, Litchfield has developed metal-bonded, carbon fiber-reinforced composites. This innovative approach involves creating a matrix-depleted zone within the composite that establishes a robust binding site for the metal. By infiltrating the metal into this matrix-free zone, a strong adhesion is achieved, enhancing the composite's overall performance. Additionally, his invention provides a surface layer of metal that can improve high-temperature performance or facilitate bonding with other composites or substrates.
Another significant patent involves the production of high-purity synthetic pyrite for thermal batteries. Litchfield's method employs both a two-step and one-step sulfidation reaction of iron powder. In the two-step reaction, hydrogen-annealed iron powder interacts with molten sulfur, transitioning to pyrrhotite, and subsequently converting to pure pyrite under controlled mixing conditions. His one-step process similarly involves heating iron powder in the presence of sulfur to prevent sintering, thereby yielding a high-quality pyrite material.
Career Highlights
Litchfield has had a fruitful career, contributing to notable companies such as Kennecott Copper Corporation and Kennecott Corporation. Throughout his tenure, he has consistently focused on research and development in materials engineering, leading to several groundbreaking patents and innovations.
Collaborations
John K. Litchfield has collaborated with esteemed professionals in the industry, including J. Paul Pemsler and Ralph W. Lai. These collaborations fostered knowledge exchange and enhanced innovation in their respective fields, showcasing the importance of teamwork in research and development.
Conclusion
John K. Litchfield's work exemplifies the essence of innovation in materials science and thermal energy storage. With nine patents to his name, his contributions have not only advanced the technology of composite materials but have also paved the way for the future of thermal battery systems. His commitment to innovation and collaboration remains an inspiration for aspiring inventors and engineers alike.