Patents by Inventor David Sikkenga

David Sikkenga 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).

  • Method of removing iron oxide deposits from the surface of titanium components
    Publication number: 20050113603
    Abstract: Disclosed is a method and solvent composition capable of removing iron oxide deposits from the surface of titanium components without substantially damaging the underlying titanium component. Iron oxide deposits may be removed from the surface of a titanium component by contacting the titanium component with the solvent composition of the invention. The solvent composition may then be removed from contact with the titanium component to obtain a recyclable solvent composition which is recycled into repeated contact with the titanium component. The solvent composition comprises an aqueous mixture of an organic acid and a hydrohalide acid.
    Type: Application
    Filed: December 17, 2004
    Publication date: May 26, 2005
    Inventors: Frank Belmonte, Kenneth Abrams, James Delaney, Scott Kramer, David Sikkenga
  • Staged countercurrent oxidation
    Publication number: 20050107630
    Abstract: A process for oxidation with oxygen of at least one aromatic hydrocarbon having oxidizable, substituents that maximizes the utilization of oxygen without reduction in the quality of the carboxylic acid products produced by means of a stagewise countercurrent oxidation system is disclosed.
    Type: Application
    Filed: November 14, 2003
    Publication date: May 19, 2005
    Inventors: Frank Belmonte, David Sikkenga, Olusola Ogundiran, Kenneth Abrams, Linus Leung, Christopher Meller, Dale Figgins, Allen Mossman
  • Preparation of a dimethylnaphthalene
    Patent number: 4962260
    Abstract: A method is disclosed for preparing one of more specific dimethylnaphthalene isomers by the isomerization of one or more other specific dimethylnaphthalene isomers in the liquid phase and in the presence of a solid zeolitic isomerization catalyst.
    Type: Grant
    Filed: October 23, 1989
    Date of Patent: October 9, 1990
    Assignee: Amoco Corporation
    Inventors: David Sikkenga, Ian C. Zaenger, Gregory S. Williams