This inventor holds 8 USPTO granted patents. Top assignee: Nova Chemicals (International) S.a.. Active years: 1999-2003.
Company Filing History:
Years Active: 1999-2003
Title: Douglas W. Stephan: Innovator in Organometallic Chemistry
Introduction
Douglas W. Stephan is a prominent inventor based in LaSalle, CA. He has made significant contributions to the field of organometallic chemistry, holding a total of 8 patents. His work primarily focuses on catalysts for olefin polymerization, showcasing his expertise and innovative spirit.
Latest Patents
Among his latest patents is the development of a bis-phosphinimine catalyst. This invention involves organometallic complexes that contain two phosphinimine ligands and at least one activatable ligand, which serve as catalyst components for olefin polymerization. The preferred polymerization systems are created by combining these organometallic complexes with an ionic activator and/or an alumoxane. Notably, the catalyst components often include titanium, zirconium, or hafnium, activated with an ionic activator to facilitate ethylene polymerization.
Another significant patent involves hydrocarbyl phosphinimine/cyclopentadienyl complexes of group IV metals. These new organometallic complexes are characterized by having a phosphinimine ligand and two or more cyclopentadienyl ligands. Some of these complexes exhibit unusual behavior when analyzed using nuclear magnetic resonance (NMR) techniques. Well-defined crystals of these inventive complexes have been isolated and analyzed through x-ray crystallography. Remarkably, these complexes have been found to be polymerization catalysts that demonstrate surprising activity compared to their simpler metallocene analogs.
Career Highlights
Douglas W. Stephan is currently associated with Nova Chemicals, a company known for its innovative approaches in the chemical industry. His work has significantly advanced the understanding and application of organometallic catalysts in polymerization processes.
Collaborations
Throughout his career, Stephan has collaborated with notable colleagues, including Stephen John Brown and Qinyan Wang. These collaborations have further enriched his research and contributed to the development of groundbreaking technologies in his field.
Conclusion
Douglas W. Stephan's contributions to organometallic chemistry and his innovative patents highlight his role as a leading inventor in the industry. His work continues to influence the development of efficient catalysts for polymerization processes, showcasing the importance of innovation in chemical research.