This inventor holds 3 USPTO granted patents. Top assignee: Ciba-Geigy Corporation. Active years: 1987-1989.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile
Location History:
- Kempton Park, ZA (1987 - 1989)
- Transvaal, ZA (1989)
Company Filing History:
Years Active: 1987-1989
Title: The Innovations of John D Stewart
Introduction
John D Stewart is a notable inventor based in Kempton Park, South Africa. He has made significant contributions to the field of chemistry, particularly in the production of pigmentary copper phthalocyanine. With a total of three patents to his name, Stewart's work has garnered attention for its innovative approach and practical applications.
Latest Patents
Stewart's latest patents focus on the production of pigmentary copper phthalocyanine. This pigment is prepared by converting crude copper phthalocyanine using established methods in the presence of trichlorophenoxy copper phthalocyanine. The resulting pigment is both heat resistant and solvent resistant, making it suitable for various industrial applications.
Career Highlights
Stewart is associated with Ciba-Geigy Corporation, a company known for its advancements in chemical products. His work at the corporation has allowed him to explore and develop innovative solutions in the field of pigments and dyes.
Collaborations
Throughout his career, Stewart has collaborated with notable coworkers such as Robert Langley and Arthur Stark Walls. These partnerships have contributed to the success of his projects and the advancement of their shared goals in innovation.
Conclusion
John D Stewart's contributions to the field of chemistry, particularly through his patents on pigmentary copper phthalocyanine, highlight his role as an influential inventor. His work continues to impact the industry positively.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile