Andrew W Yates

Title: Andrew W. Yates: Innovator in Photographic Materials

Introduction

Andrew W. Yates is a notable inventor based in Knutsford, GB. He has made significant contributions to the field of photographic materials, holding a total of 2 patents. His work focuses on the development of compounds and processes that enhance the quality and sensitivity of photographic emulsions.

Latest Patents

Yates' latest patents include innovative advancements in the realm of photographic technology. One of his patents is for Tetra-aza indene compounds, which are characterized by the formula ##STR1## wherein R.sub.1 is alkyl or a ring system, and R.sub.2 and R.sub.3 are hydrogen or alkyl. These compounds serve a crucial role as image toners in photographic materials. Another significant patent involves a process for the preparation of silver halide emulsions. This process includes transferring monodispersed silver halide crystals from a reaction vessel to a holding vessel, allowing for the growth of remaining crystals, and ultimately producing a fully sensitized and concentrated silver halide emulsion. These emulsions are known to exhibit reduced contrast and relatively high sensitivity when used in photographic applications.

Career Highlights

Andrew W. Yates has been associated with Ciba-Geigy AG, where he has contributed to various innovative projects. His expertise in the field of photographic materials has positioned him as a key figure in the development of advanced imaging technologies.

Collaborations

Yates has collaborated with notable colleagues, including David Rowland and Michael E. Dale. Their combined efforts have led to significant advancements in the field of photographic materials.

Conclusion

Andrew W. Yates is a distinguished inventor whose work in photographic materials has led to the development of innovative compounds and processes. His contributions continue to influence the industry, showcasing the importance of innovation in enhancing photographic technology.