David A Evans

Title: Innovations of David A. Evans

Introduction

David A. Evans is a notable inventor based in Chelmsford, MA (US). He has made significant contributions to the field of composite materials, holding a total of four patents. His work focuses on innovative methods for creating advanced tooling and vessel structures.

Latest Patents

One of his latest patents is a method for forming complex composite articles. This method involves creating a flexible composite tool specifically designed for composite molding. The process includes dissolving a B-staged fluoroelastomer in a solvent such as methyl ethyl ketone or toluene to produce a fluoroelastomer solution. A fabric is then coated with this solution, and after the solvent evaporates, the impregnated fabric is sandwiched between unreinforced sheets to create a reinforced tooling material. This material is laid up with alternating layers of unreinforced fluoroelastomer and cured to produce a composite tool that remains stable through multiple thermal cycles. Additionally, the elastomer tool can feature detail cavities for precise placement of separately formed structures, enhancing its usability in molding composites. The tool is designed to be reusable, and a method for repairing damaged portions further extends its lifespan.

Another significant patent involves vessel construction, which is tailored for containing mobile or highly permeating fluids such as helium gas or liquid hydrogen or oxygen. The design incorporates a barrier layer made from an oriented lyotropic liquid crystal polymer film, with preferred materials including polybenzazole (PBZ) polymers. This innovative approach effectively inhibits the escape of the contained fluid.

Career Highlights

David A. Evans has worked with prominent companies such as Foster-Miller, Inc. and United Technologies Corporation. His experience in these organizations has contributed to his expertise in the development of advanced materials and technologies.

Collaborations

Throughout his career, Evans has collaborated with notable individuals, including Alex C. Dublinski and Joseph Goldberg. These partnerships have likely enriched his work and led to further innovations in his field.

Conclusion

David A. Evans is a distinguished inventor whose work in composite materials and vessel construction has led to significant advancements in technology. His innovative patents and collaborations reflect his commitment to pushing the boundaries of engineering and materials science.