Yew C Chang

Title: Yew C Chang: Innovator in Color Developing Compositions

Introduction

Yew C Chang is a notable inventor based in Westlake Village, CA (US). He has made significant contributions to the field of color developing compositions, particularly for carbonless paper copying systems. With a total of 2 patents, his work has had a lasting impact on the industry.

Latest Patents

One of Yew C Chang's latest patents is a color developing composition for pressure-sensitive recording systems. This composition comprises an admixture of an alkylidenediphenol and calcium carbonate, formulated in high solids content coating colors. The resulting product exhibits excellent rheological properties and stability, which are essential for producing CF sheets with a specific coating weight. The preferred formulation includes Bisphenol A and ensures that the calcium carbonate weight percentage in the CF coating exceeds 50%. Another significant patent involves finely divided calcium carbonate compositions, which are useful as opacifying fillers for paper. These compositions are characterized by a fine particle size distribution and can be utilized in both aqueous slurry and dry forms.

Career Highlights

Throughout his career, Yew C Chang has worked with prominent companies such as Cyprus Mines Corporation and Amoco Corporation. His experience in these organizations has contributed to his expertise in developing innovative materials and compositions.

Collaborations

Yew C Chang has collaborated with notable individuals in his field, including Robert D Stewart and Norman O Clark. These partnerships have likely enhanced his research and development efforts.

Conclusion

Yew C Chang's contributions to the field of color developing compositions demonstrate his innovative spirit and dedication to advancing technology. His patents reflect a commitment to improving the efficiency and effectiveness of carbonless paper copying systems.