Alfred P Marchetti

Title: Alfred P Marchetti: Innovator in Photographic Emulsions

Introduction

Alfred P Marchetti is a notable inventor based in Penfield, NY (US), recognized for his contributions to the field of photographic emulsions. He holds a total of 9 patents, showcasing his innovative spirit and technical expertise.

Latest Patents

Marchetti's latest patents include significant advancements in photographic technology. One of his notable inventions is the "Non-uniform iodide high chloride {100} tabular grain emulsion." This invention features a high chloride {100} tabular grain emulsion that contains a non-uniform distribution of iodide to enhance sensitivity. A substantial percentage of the {100} tabular grains exhibit one or more crystal lattice dislocation lines at sites of maximum iodide concentration. These dislocation lines are uniquely oriented parallel to at least one edge of the {100} tabular grains. The method for producing these dislocation lines involves a relatively slow addition of iodide ion, which improves the reproducibility of emulsion properties during manufacturing. Additionally, relatively low overall levels of iodide are utilized, allowing for rapid development rates.

Another significant patent is for "High-speed direct-positive photographic elements." This invention comprises a support and a silver halide emulsion layer that contains core-shell silver halide grains. These grains consist of a chemically sensitized core and a chemically sensitized shell, with at least one of the core or shell incorporating a band of dopant, specifically hexacyano ruthenium (II). The shell is chemically sensitized with both a gold-containing chemical sensitizing agent and a sulfur-containing chemical sensitizing agent, with a preferred weight ratio of at least two to one.

Career Highlights

Marchetti has made substantial contributions to the photographic industry through his work at Eastman Kodak Company. His innovative patents have played a crucial role in advancing photographic technology and improving the quality of photographic elements.

Collaborations

Throughout his career, Marchetti has collaborated with notable colleagues, including Woodrow G McDugle, Jr and John E Keevert. These collaborations have further enriched his work and contributed to the development of groundbreaking photographic technologies.

Conclusion

Alfred P Marchetti's innovative contributions to photographic emulsions and his numerous patents highlight his significant impact on the industry. His work continues to influence advancements in photographic technology