Location History:
- Pineville, NC (US) (1985 - 1989)
- Charlotte, NC (US) (1986 - 1994)
Company Filing History:
3 out of 824 
2 out of 1,194 
1 out of 7 Years Active: 1985-1994
Title: The Innovations of Marvin L. Doerr
Introduction
Marvin L. Doerr is a notable inventor based in Charlotte, NC, with a significant contribution to the field of polymer chemistry. He holds six patents, showcasing his innovative approach to solving complex problems in polyester production.
Latest Patents
One of his latest patents is for a process of producing poly(1,3-propylene terephthalate). This process involves the reaction of either terephthalic acid or a lower dialkyl ester of terephthalic acid with 1,3-propanediol, followed by the polymerization of the resulting monomer using a novel catalyst system. The catalyst composition includes an effective catalytic amount of tin in the polycondensation reaction. This innovative approach, combined with Hostaperm pigments, allows for the production of poly(1,3-propylene terephthalate) with a yellowness of less than 4 and an intrinsic viscosity of at least 0.80 dl/g. Another significant patent involves a process for centrifugally removing inorganic compounds from polyester. This method addresses the removal of inorganic compounds from glycol recovery still bottoms resulting from the manufacture of poly(ethylene terephthalate). The process utilizes a small amount of phosphoric acid to precipitate antimony, followed by the removal of titanium dioxide and antimony compounds using a centrifuge.
Career Highlights
Marvin L. Doerr has worked with prominent companies in the industry, including Celanese GmbH and Hoechst Celanese Corporation. His experience in these organizations has contributed to his expertise in polymer production and innovation.
Collaborations
Throughout his career, Marvin has collaborated with notable colleagues such as Joseph J. Hammer and J. R. Dees. These partnerships have likely fostered a creative environment that has led to significant advancements in their respective fields.
Conclusion
Marvin L. Doerr's contributions to polymer chemistry and his innovative patents reflect his dedication to advancing the industry. His work continues to influence the production processes of polyesters, showcasing the importance of innovation in material science.
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.