Company Filing History:
2 out of 70 
1 out of 2,921 
Years Active: 1990-1998
Title: Ching F Chang: Innovator in Coal Tar Technology
Introduction
Ching F Chang is a notable inventor based in Strongsville, OH (US). He has made significant contributions to the field of coal tar technology, holding a total of 3 patents. His innovative methods have advanced the production and treatment of coal tar, showcasing his expertise and dedication to the industry.
Latest Patents
Chang's latest patents include a method for the production of solids-free coal tar pitch. This process effectively converts coal tar containing quinoline-insoluble particles (Q.I.) into a substantially Q.I.-free coal tar pitch, along with a separate Q.I.-containing coal tar pitch. The method involves subjecting dehydrated coal tar, soft coal tar pitch, or hard coal tar pitch to continuous cross-flow filtration in a circulation loop. This results in two distinct streams: one that is substantially Q.I.-free and another that contains Q.I. The two streams can then be further fractionated to produce the desired coal tar pitches.
Another significant patent by Chang is a continuous method for increasing the Q.I. concentration of liquid tar. This method treats liquid tar containing Q.I. solids to yield a product with increased Q.I. concentration, while also producing a Q.I.-free liquid tar product. The innovative approach utilizes cross-flow filter membranes to achieve these results.
Career Highlights
Throughout his career, Ching F Chang has worked with prominent companies in the industry, including Ucar Carbon Technology Corporation and Union Carbide Corporation. His experience in these organizations has contributed to his expertise in coal tar technology and innovation.
Collaborations
Chang has collaborated with notable individuals in his field, including Irwin Charles Lewis and Richard Liichang Shao. These partnerships have likely enhanced his research and development efforts, leading to his successful patent applications.
Conclusion
Ching F Chang's contributions to coal tar technology through his innovative patents demonstrate his significant impact on the industry. His work continues to influence advancements in the production and treatment of coal tar, solidifying his reputation as a leading inventor in this field.