Company Filing History:
8 out of 140 
1 out of 10 Years Active: 1985-1995
Title: The Innovative Contributions of Wolfgang Weiss
Introduction
Wolfgang Weiss is a notable inventor based in Neckarhausen, Germany. He has made significant contributions to the field of chemistry, particularly in the development of various chemical processes. With a total of nine patents to his name, Weiss has demonstrated a commitment to innovation and scientific advancement.
Latest Patents
Among his latest patents is the "Preparation of isomer-free 2,5-dichloro-pyridine." This process involves alkoxylating 2-chloro-pyridine or 2-bromo-pyridine in the presence of a base at elevated temperatures. The alkoxylated product is then chlorinated with gaseous chlorine at ambient temperatures in an aqueous suspension, utilizing an auxiliary base, a small amount of a catalyst, and optionally an emulsifier. The isomer reaction mixture is treated with a Vielsmeyer-Haack reagent, followed by water vapor distillation and crystallization from an alcohol-water mixture.
Another significant patent is the "Preparation of 9,9-bis-(4-hydroxyphenyl)-fluorene." This invention describes the production of 9,9-bis-(4-hydroxyphenyl)-fluorene through the condensation of fluorenone and phenol in a molar ratio of 1:4 to 1:8 at temperatures ranging from 30 to 90 degrees Celsius. The process employs gaseous hydrogen chloride and β-mercapto-propionic acid as a catalyst. The improvement involves mixing the completed reaction mixture with a polyalkylene glycol, distilling excess phenol, and recovering the crystallized product through a series of steps.
Career Highlights
Wolfgang Weiss has worked with prominent companies such as Rutgerswerke Aktiengesellschaft and Ruetgerswerke Aktiengesellschaft. His experience in these organizations has contributed to his expertise in chemical processes and patent development.
Collaborations
Throughout his career, Weiss has collaborated with notable individuals, including Winfried Orth and Hans W. Kleffner. These partnerships have likely enriched his work and led to innovative solutions in his field.
Conclusion
Wolfgang Weiss is a distinguished inventor whose contributions to chemical processes have been recognized through multiple patents. His innovative work continues to impact the field of chemistry, showcasing the importance of research and development in driving scientific progress.