Patents by Inventor Arend K. Van Helden

Arend K. Van Helden 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).

  • Stabilized copolymer compositions
    Patent number: 5115002
    Abstract: A copolymer compositions comprising a major amount of an alternating copolymer of carbon monoxide with one or more olefinically unsaturated compounds and a minor of at least one stabilizing additive which is a zeolite-type trivalent-metal silicate containing a cation of an element of Group 2 of the Periodic Table is disclosed. This copolymer composition has and exhibits improved stability and contains a substantially reduced amount of residual solvent. Also disclosed is a process for producing this copolymer composition, and articles of manufacture made from this composition.
    Type: Grant
    Filed: August 29, 1991
    Date of Patent: May 19, 1992
    Assignee: Shell Oil Company
    Inventors: Arend K. Van Helden, Jean-Pierre Gilson, Johannes L. M. Syrier