Patents by Inventor Steven C. Haas

Steven C. Haas has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Metallocene synthesis process
    Patent number: 11279723
    Abstract: A process to synthesize a Group 4 ansa-metallocene. The process includes reacting an alkaline earth metal dianion dicyclopentadiene ligand-Lewis base complex with a Group 4 metal tetrahalide in the presence of an alkali metal halide, and forming the Group 4 ansa-metallocene dihalide with high yield and purity.
    Type: Grant
    Filed: June 20, 2019
    Date of Patent: March 22, 2022
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Charles J. Harlan, Matthew W. Holtcamp, Subramaniam Kuppuswamy, Steven C. Haas
  • Metallocene Synthesis Process
    Publication number: 20210246155
    Abstract: A process to synthesize a Group 4 ansa-metallocene. The process includes reacting an alkaline earth metal dianion dicyclopentadiene ligand-Lewis base complex with a Group 4 metal tetrahalide in the presence of an alkali metal halide, and forming the Group 4 ansa-metallocene dihalide with high yield and purity.
    Type: Application
    Filed: June 20, 2019
    Publication date: August 12, 2021
    Inventors: Charles J. Harlan, Matthew W. Holtcamp, Subramaniam Kuppuswamy, Steven C. Haas
  • Toluene free silica supported single-site metallocene catalysts from in-situ supported alumoxane formation in aliphatic solvents
    Patent number: 11021552
    Abstract: The present disclosure provides methods for preparing a catalyst system comprising contacting in an aliphatic solvent at least one support material, at least one hydrocarbyl aluminum compound and at least one non-hydrolytic active oxygen-containing compound to form a supported alumoxane (catalyst system precursor) and contacting the supported alumoxane with at least one catalyst compound having a Group 3 through Group 12 metal atom or lanthanide metal atom. The supported alumoxane may be heated prior to contact with the catalyst compound.
    Type: Grant
    Filed: September 17, 2018
    Date of Patent: June 1, 2021
    Assignee: ExxonMobil Chemical Patents Inc.
    Inventors: Charles J. Harlan, Steven C. Haas, Lubin Luo, Francis C. Rix, Xuan Ye
  • Toluene Free Silica Supported Single-Site Metallocene Catalysts from In-situ Supported Alumoxane Formation in Aliphatic Solvents
    Publication number: 20190127499
    Abstract: The present disclosure provides methods for preparing a catalyst system comprising contacting in an aliphatic solvent at least one support material, at least one hydrocarbyl aluminum compound and at least one non-hydrolytic active oxygen-containing compound to form a supported alumoxane (catalyst precursor) and contacting the supported alumoxane with at least one catalyst compound having a Group 3 through Group 12 metal atom or lanthanide metal atom. The supported alumoxane may be heated prior to contact with the catalyst compound.
    Type: Application
    Filed: September 17, 2018
    Publication date: May 2, 2019
    Inventors: Charles J. Harlan, Steven C. Haas, Lubin Luo, Francis C. Rix, Xuan Ye