This inventor holds 2 USPTO granted patents. Top assignees: Polaroid Corporation, Other. Active years: 1980-1981.
Company Filing History:
1 out of 2,176 
1 out of 834,453 Years Active: 1980-1981
Title: The Innovations of John W Sparks
Introduction
John W Sparks is a notable inventor based in Boston, MA. He has made significant contributions to the field of chemistry, particularly in the synthesis of various compounds. With a total of 2 patents, Sparks has demonstrated his innovative capabilities through his research and development efforts.
Latest Patents
Sparks' latest patents include a process for preparing 4-aminopyrazolo-(3,4-d)pyrimidine. This patent describes a method for synthesizing 4-aminopyrazolo(3,4-d)pyrimidine by reacting 3-amino-4-cyanopyrazole with formamidine or a salt of formamidine at temperatures ranging from about 85°C to about 125°C. Another significant patent is for the process of synthesizing thiacyanine dyes. This process involves alkylating a 2-halo, 2-alkoxy, or 2-aryloxybenzothiazole with a strong alkylating agent to form a quaternized benzothiazole, which is then condensed with a benzothiazolium betaine in a nonaqueous homogeneous medium. The resulting thiacyanine dye is useful for enhancing the photosensitivity of blue-sensitive silver halide emulsions.
Career Highlights
Throughout his career, John W Sparks has worked with various companies, including Polaroid Corporation. His work has contributed to advancements in the field of chemistry and has had a lasting impact on the industry.
Collaborations
Sparks has collaborated with notable individuals, including his coworker Henry Bader. Their joint efforts have furthered the development of innovative processes and products.
Conclusion
John W Sparks is a distinguished inventor whose work in the synthesis of chemical compounds has led to valuable patents and advancements in the field. His contributions continue to influence the industry and inspire future innovations.