Patents by Inventor John J. Ziemiak

John J. Ziemiak 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).

  • Staged-acidity reforming (C-2705)
    Patent number: 5292427
    Abstract: Staged-Acidity Naphtha Reforming provides increased C.sub.5+ liquid yields by systematically adjusting catalyst acidity within a multireactor reformer to match the different acid strengths required to selectively aromatize naphthene and paraffin hydrocarbon as they traverse the reformer train.
    Type: Grant
    Filed: December 17, 1992
    Date of Patent: March 8, 1994
    Assignee: Exxon Research & Engineering Co.
    Inventors: Gary B. McVicker, John J. Ziemiak
  • Removal of metal comtaminants from catalysts using buffered oxalic acid
    Patent number: 4522928
    Abstract: A process for removing metal contaminants from a hydroconversion catalyst, said catalyst containing at least one metal from Groups VIB, VIIB or VIII supported on a refractory inorganic oxide. The process comprises contacting the contaminated catalyst with a buffered oxalic acid solution wherein contaminant is removed without dissolving the support.
    Type: Grant
    Filed: May 14, 1984
    Date of Patent: June 11, 1985
    Assignee: Exxon Research and Engineering Co.
    Inventors: Gary B. McVicker, James L. Carter, Lawrence L. Murrell, John J. Ziemiak