Patents by Inventor John A. Sanbrano

John A. Sanbrano 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).

  • Olefin polymerization method
    Patent number: 4460756
    Abstract: A supported chromium oxide polymerization catalyst is prepared by a process which includes the steps of heating silica-supported chromium oxide or a substance oxidizable to chromium oxide in a nonoxidizing atmosphere in the presence of formaldehyde or a compound thermally decomposable to formaldehyde, and then heating the thus-treated catalyst in an oxygen-containing atmosphere. The temperatures of the respective heating steps can vary depending upon the properties desired in the polymer to be produced with the invention catalyst; however, the invention catalyst preparation method enables the production of a catalyst having a high melt index potential at relatively low treatment temperatures, e.g. no higher than about 600.degree. C.
    Type: Grant
    Filed: March 28, 1983
    Date of Patent: July 17, 1984
    Assignee: Phillips Petroleum Company
    Inventors: Max P. McDaniel, John A. Sanbrano, Marvin M. Johnson
  • Olefin polymerization catalyst
    Patent number: 4397769
    Abstract: A supported chromium oxide polymerization catalyst is prepared by a process which includes the steps of heating silica-supported chromium oxide or a substance oxidizable to chromium oxide in a nonoxidizing atmosphere in the presence of formaldehyde or a compound thermally decomposable to formaldehyde, and then heating the thus-treated catalyst in an oxygen-containing atmosphere. The temperatures of the respective heating steps can vary depending upon the properties desired in the polymer to be produced with the invention catalyst; however, the invention catalyst preparation method enables the production of a catalyst having a high melt index potential at relatively low treatment temperatures, e.g. no higher than about 600.degree. C.
    Type: Grant
    Filed: April 2, 1981
    Date of Patent: August 9, 1983
    Assignee: Phillips Petroleum Company
    Inventors: Max P. McDaniel, John A. Sanbrano, Marvin M. Johnson