Patents by Inventor David George COLLOPY

David George COLLOPY 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).

  • CHROMIUM-ON-SILICA CATALYSTS AND METHODS OF MAKING THE SAME
    Publication number: 20230365725
    Abstract: A composition, such as a catalyst precursor or a catalyst comprising a Cr coated silica support with particularly defined levels of Na and Al, such that the resulting Cr/Silica catalyst has an increased MI potential is disclosed. In an embodiment, the disclosed catalyst composition comprises a silica-containing substrate made using a base-set gel and comprising a catalytically active metal consisting of Cr, with Al impurities of less than 50 ppm and Na in an amount of less than 800 ppm of the catalyst composition. The disclosed composition has an increased MI potential over a catalyst having higher Al content, a lower Na:Al ratio, or both. Methods of making the disclosed composition, and methods of using it to prepare a polyethylene are also disclosed.
    Type: Application
    Filed: July 21, 2023
    Publication date: November 16, 2023
    Inventors: Yatao Rachel HU, Parag Rasiklal SHAH, David George COLLOPY, Robert Joseph PARKER, Myoung Kie LEE
  • Chromium-on-silica catalysts and methods of making the same
    Patent number: 11732065
    Abstract: A composition, such as a catalyst precursor or a catalyst comprising a Cr coated silica support with particularly defined levels of Na and Al, such that the resulting Cr/Silica catalyst has an increased MI potential is disclosed. In an embodiment, the disclosed catalyst composition comprises a silica-containing substrate made using a base-set gel and comprising a catalytically active metal consisting of Cr, with Al impurities of less than 50 ppm and Na in an amount of less than 800 ppm of the catalyst composition. The disclosed composition has an increased MI potential over a catalyst having higher Al content, a lower Na:Al ratio, or both. Methods of making the disclosed composition, and methods of using it to prepare a polyethylene are also disclosed.
    Type: Grant
    Filed: February 28, 2020
    Date of Patent: August 22, 2023
    Assignee: PQ Corporation
    Inventors: Yatao Rachel Hu, Parag Rasiklal Shah, David George Collopy, Robert Joseph Parker, Myoung Kie Lee
  • CHROMIUM-ON-SILICA CATALYSTS AND METHODS OF MAKING THE SAME
    Publication number: 20210269562
    Abstract: A composition, such as a catalyst precursor or a catalyst comprising a Cr coated silica support with particularly defined levels of Na and Al, such that the resulting Cr/Silica catalyst has an increased MI potential is disclosed. In an embodiment, the disclosed catalyst composition comprises a silica-containing substrate made using a base-set gel and comprising a catalytically active metal consisting of Cr, with Al impurities of less than 50 ppm and Na in an amount of less than 800 ppm of the catalyst composition. The disclosed composition has an increased MI potential over a catalyst having higher Al content, a lower Na:Al ratio, or both. Methods of making the disclosed composition, and methods of using it to prepare a polyethylene are also disclosed.
    Type: Application
    Filed: February 28, 2020
    Publication date: September 2, 2021
    Inventors: Yatao Rachel HU, Parag Rasiklal SHAH, David George COLLOPY, Robert Joseph PARKER, Myoung Kie LEE