Patents Represented by Attorney Witta O. Priester

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  • Olefin polymerization using aluminoxane/chromium catalysts
    Patent number: 6031055
    Abstract: A method of controlling the molecular weight distribution of a polyalpha-olefin during polymerization, comprising changing the aluminoxane to chromium ratio of a polymerization catalyst comprising chromium and at least one aluminoxane to thereby adjust the molecular weight distribution.
    Type: Grant
    Filed: January 25, 1993
    Date of Patent: February 29, 2000
    Assignee: Chevron Chemical Company
    Inventors: Pamela R. Auburn, David L. Beach
  • Hydrodealkylation processes
    Patent number: 5866743
    Abstract: Carburization and metal-dusting while hydrodealkylating a hydrodealkylatable hydrocarbon are reduced even in the substantial absence of added sulfur.
    Type: Grant
    Filed: January 11, 1996
    Date of Patent: February 2, 1999
    Assignee: Chevron Chemical Company
    Inventors: John V. Heyse, Bernard F. Mulaskey, Robert A. Innes, Daniel P. Hagewiesche, William J. Cannella, David C. Kramer
  • Reactor system steel portion
    Patent number: 5648178
    Abstract: Methods for cracking hydrocarbons in reactor systems having improved resistances to carburization and coking. The reactor system comprises a steel portion having provided thereon a Group VIB metal protective layer to isolate the steel portion from hydrocarbons, applied to a thickness effective for isolating the steel portion from the hydrocarbon environment. The protective layer is anchored to the steel substrate through an intermediate carbide-rich, bonding layer.
    Type: Grant
    Filed: December 28, 1994
    Date of Patent: July 15, 1997
    Assignee: Chevron Chemical Company
    Inventors: John V. Heyse, Alan G. Kunze