Company Filing History:
1 out of 1,055 
1 out of 1,192 Years Active: 1978-1980
Title: **Innovations by David R. Marsh: A Pioneer in Phthalic Acid Production**
Introduction
David R. Marsh, an accomplished inventor based in Lisle, IL, has made significant contributions to the field of chemical engineering. With a focus on the continuous production and recovery of iso- and terephthalic acid, Marsh holds two patents that showcase his innovative approach to chemical processes.
Latest Patents
Marsh's latest patents revolve around methods for enhancing the production of iso- or terephthalic acid. The first patent details an apparatus for continuous production through catalytic air oxidation of m- or p-xylene within a stirred reaction zone. This process utilizes a benzoic acid-water solvent system under specific gauge pressure, maintaining an oxidation temperature between 175°C to 235°C. A remarkable aspect of this invention is the novel control of oxidation temperature achieved by varying the flow rate of water condensate reflux. Additionally, the second patent outlines a method for continuous recovery of phthalic acid product from fluid effluent and describes a combination of apparatus essential for conducting these oxidation and recovery processes efficiently.
Career Highlights
Throughout his career, David R. Marsh has contributed to notable companies, including the Standard Oil Company (Indiana) and The Standard Oil Company. His experience in these organizations has bolstered his expertise in chemical processes and innovation.
Collaborations
David R. Marsh has had the opportunity to collaborate with Leonard E. Stark, a fellow innovator in the field. Their partnership has likely spurred further advancements in chemical technology.
Conclusion
David R. Marsh stands out as a visionary inventor whose patents have advanced the field of iso- and terephthalic acid production. His innovative approaches and collaborative spirit continue to inspire future generations of inventors. Through his work, Marsh has significantly impacted chemical engineering, showcasing the importance of continuous innovation in industrial processes.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.