Hans Heinrich Credner

Title: Innovator Hans Heinrich Credner – Pioneering Photographic Couplers

Introduction

Hans Heinrich Credner, an acclaimed inventor based in Hohenschaeftlarn, Germany, has made significant contributions to the field of photography through his innovative patented technologies. With two patents to his name, Credner's work primarily focuses on enhancing the quality and efficiency of photographic materials.

Latest Patents

Credner's latest patents include groundbreaking methods for developing photographic materials. The first patent, titled "Photographic material containing oxazolinone-2 couplers," details the use of monocyclic oxazolinone-2 structures as effective photographic couplers. These couplers display a unique characteristic where the oxazolinone-2 ring splits during the coupling process, resulting in the formation of vibrant dyes. The method outlined allows for the couplers to be synthesized by condensing an α-halocarbonyl compound with an inorganic cyanate in a largely aprotic solvent, potentially including a minor amount of water.

His second patent, "Light-sensitive photographic material," introduces oxazolinone-2 derivatives that possess a releasable mercapto group in the 5-position. These compounds serve as development-inhibitor-releasing thioether materials designed for use in color photographic processes. They demonstrate high reactivity during chromogenic development, while also being easy to produce.

Career Highlights

Credner works at Agfa-Gevaert AG, a well-known company in the imaging technology industry. His career is marked by a commitment to improving photographic materials and processes, significantly influencing the way color photography has evolved.

Collaborations

Throughout his career, Credner has collaborated with notable colleagues such as Wolfgang Lassig and Ernst Meier. Working together, they have pushed the boundaries of photographic technology and have played vital roles in the development of innovative photographic materials that have advanced the industry.

Conclusion

Hans Heinrich Credner stands out as a prominent inventor whose innovative work has transformed photographic materials. With his patents contributing to a greater understanding and functionality of photographic couplers and materials, Credner's legacy continues to influence the realm of color photography and beyond.