E Dean Johnston

Title: Innovations by E Dean Johnston in Adhesive Technology

Introduction

E Dean Johnston, an innovative inventor based in Fullerton, CA, holds two patents that reflect his remarkable contributions to adhesive technology in electronic assemblies. His work primarily revolves around creating flexible and thermally-conductive adhesives that enhance the functionality and durability of electronic components.

Latest Patents

The first of Johnston's latest patents focuses on reworkable, thermally-conductive adhesives designed for electronic assembly applications. This invention details an adhesive and method for securely attaching a heat sink to a printed wiring assembly, effectively providing a thermal path from the electronic components to the heat sink. The adhesive has unique properties, as it is flexible enough to accommodate thermal expansion stresses while remaining readily reworkable. The design includes a filler material, often composed of spherical alumina particles, which is impregnated with a flexible epoxy resin. This innovative approach maximizes packing density and ensures a robust thermal connection.

Johnston's second patent introduces a one-component epoxy adhesive composition that is electrically conductive and flexible. This adhesive includes a polyepoxide resin combined with an amine-terminated butadiene-acrylonitrile polymer, ensuring a workable bond that is resilient and non-brittle. Upon curing, the adhesive demonstrates impressive drop resistance—capable of withstanding multiple drops from significant heights—making it suitable for demanding electronic applications.

Career Highlights

E Dean Johnston's career is prominently marked by his association with Raytheon Company, where he has been instrumental in advancing adhesive technologies. His extensive knowledge and innovative spirit in this field have led to the successful development of patents that address modern electronic assembly challenges.

Collaborations

Throughout his career, Johnston has collaborated with notable colleagues such as Ralph D Hermansen and Steven E Lau. Their collective efforts have fostered an environment of innovation, leading to significant advancements in adhesive materials that not only meet but exceed industry standards.

Conclusion

E Dean Johnston's work exemplifies the importance of innovation in adhesive technologies, particularly in the field of electronics. With his patented solutions, he has contributed to improving product performance and reliability in electronic assemblies. His integration of flexibility, conductivity, and reworkability in adhesives showcases the critical role of inventors in shaping the future of technology.