Company Filing History:
4 out of 21,595 
1 out of 832,891 Years Active: 1976-1999
Title: Inventor Spotlight: Francis J. Evans from Rochester, NY
Introduction
Francis J. Evans, an inventive mind hailing from Rochester, NY, has made notable contributions to the field of photography through his innovative patents. With a total of five patents to his name, Evans's work has greatly impacted the performance and quality of photographic emulsions.
Latest Patents
Among his latest innovations is a patent focusing on the performance of photographic emulsions at high silver ion concentrations. This invention describes a photographic recording material that includes a support and a photosensitive chemically sensitized silver halide emulsion layer. The emulsion contains a sensitizing dye from a group consisting of oxonal dyes, merocyanine dyes, and cyanine dyes, characterized by a negative net charge. This formulation typically has a pH value ranging from 2 to 5 and a pAg value between 1 and 4.7.
Additionally, he holds a patent related to photographic emulsions sensitized by the introduction of oligomers. This particular innovation involves a photographic silver halide emulsion where the grains exhibit a face-centered cubic crystal lattice structure. At adjacent cation sites within these grains, metal ions from group VIII, specifically from periods 5 and 6, are incorporated by sensitizing the grains with oligomers that contain at least two of these metal ions.
Career Highlights
Throughout his career, Francis J. Evans has been associated with prestigious companies, most notably the Eastman Kodak Company, where he contributed his expertise to advance photographic technology. His work has garnered attention for optimizing the properties of photographic materials.
Collaborations
Evans has collaborated with esteemed colleagues, including James T. Kofron and Robert E. Booms, who have shared in the pursuit of innovation within the field of photography. Their combined efforts have driven advancements that benefit both amateur and professional photographers alike.
Conclusion
In summary, Francis J. Evans's inventive contributions to photographic material technology have established him as a significant figure in the realm of innovations and patents. His continued dedication to enhancing photographic emulsions exemplifies the spirit of invention that drives the industry forward.