Company Filing History:
2 out of 658 
1 out of 2 Years Active: 1981-1982
Title: The Innovations of Hans-Joachim Herrmann
Introduction
Hans-Joachim Herrmann is a notable inventor based in Troisdorf, Germany. He has made significant contributions to the field of chemistry, particularly in the development of processes involving hydrazobenzenes and polymeric azomethines. With a total of 3 patents to his name, Herrmann's work showcases his expertise and innovative spirit.
Latest Patents
One of Herrmann's latest patents is a process for the preparation of hydrazobenzenes by catalytic hydrogenation. This process involves the hydrogenation of nitrobenzene with hydrogen to produce hydrazobenzene at temperatures ranging from 40°C to 110°C. The reaction occurs in the presence of a precious metal catalyst, an aqueous alkaline solution, and an organic solvent. The improvement in this process is that the nitrobenzene used can be o-, m-, or p-chloronitrobenzene, and the reaction is carried out in an organic solvent that allows for the dichlorohydrazobenzene to be readily soluble when warm and difficultly soluble when cold. The precious metal catalyst is utilized in a specific weight ratio to ensure optimal results.
Another significant patent by Herrmann involves the development of polymeric azomethines. This invention focuses on an aromatic polyazomethine with a specific structural formula, where R can represent hydrogen, halogen, alkyl, or alkoxy. These innovations highlight Herrmann's commitment to advancing chemical processes and materials.
Career Highlights
Throughout his career, Hans-Joachim Herrmann has worked with prominent companies, including Dynamit Nobel Aktiengesellschaft. His experience in these organizations has allowed him to refine his skills and contribute to various innovative projects.
Collaborations
Herrmann has collaborated with notable colleagues such as Gunther Meyer and Klaus-Dieter Steffen. These partnerships have likely enriched his work and led to further advancements in his field.
Conclusion
Hans-Joachim Herrmann's contributions to the field of chemistry through his patents and collaborations demonstrate his innovative mindset and dedication to scientific progress. His work continues to influence the development of new chemical processes and materials.