Tawara Kumamura

Title: Tawara Kumamura and Heat-Developable Color Photography

Introduction

Tawara Kumamura is an inventor associated with Tokyo, Japan, and Konishiroku Photo Industry Co., Ltd. The supplied information identifies her as a woman and credits her with 1 patent.

Latest Patents

Kumamura’s listed patent is titled “Heat Developable Color Light-Sensitive Material.” It describes a photographic material with multiple light-sensitive layers, each containing silver halide, an organic silver salt, a dye-donating material, a reducing agent, and a hydrophilic binder. The layers differ in color sensitivity and the hue of the diffusible dye they produce.

The invention hardens at least one layer containing dye-donating materials. According to the supplied description, this helps prevent dye-donating material from diffusing between layers and reduces or prevents color crossover. It also improves dye transferability and the scratch resistance of the photographic layers.

Career Highlights

The available information connects Kumamura’s patent work with Konishiroku Photo Industry Co., Ltd. Her listed invention addresses challenges in heat-developed color photography, particularly controlling dye movement while maintaining image transfer and layer durability.

Collaborations

Fumio Ishii and Kunihiro Koshizuka are identified as Kumamura’s coworkers. The supplied information does not specify their roles in the patent or the extent of their collaboration.

Conclusion

Tawara Kumamura’s listed patent focuses on improving heat-developable color photographic materials by limiting dye diffusion and enhancing transferability and scratch resistance.