David C Joy

Title: David C Joy: Innovator in Electron Emissive Materials

Introduction

David C Joy is a notable inventor based in Warren, NJ (US). He has made significant contributions to the field of materials science, particularly in the development of innovative electron emissive materials. With a total of 3 patents, Joy's work has implications in various technological applications.

Latest Patents

One of Joy's latest patents is focused on the induced crystallographic modification of aromatic compounds. This invention involves materials that change their crystal structure upon radiation with a beam of electrons. Notable materials such as perylene dianhydride, naphthalene dianhydride, and perylene tetracarboxylic diimide based compounds undergo a transformation from one crystalline structure to another when exposed to energetic electrons. This transformation results in changes to their optical, electrical, and solubility properties. Consequently, these materials are useful as resists for delineating patterns, as optical storage media, and in processes for producing patterns of conductive materials, which are essential in semiconductor technology.

Another significant patent by Joy is the development of a low work function hexaboride electron source. This invention describes an electron source using an electron emissive material with a specific composition represented by the nominal atom formula La.sub.x (Nd.sub.y Pr.sub.1-y).sub.1-x B.sub.6. This electron source is particularly well-suited for use in instruments such as scanning electron microscopes and electron beam exposure systems.

Career Highlights

David C Joy has had a distinguished career at Bell Telephone Laboratories, where he has been instrumental in advancing research in electron emissive materials. His innovative work has contributed to the development of technologies that are widely used in various scientific and industrial applications.

Collaborations

Throughout his career, Joy has collaborated with notable colleagues, including Paul H Schmidt and Martin L Kaplan. These collaborations have further enriched his research and contributed to the advancement of the field.

Conclusion

David C Joy's contributions to the field of materials science, particularly in electron emissive materials, have made a significant impact on technology. His innovative patents and work at Bell Telephone Laboratories highlight his role as a leading inventor in this domain.