Patents by Inventor Jacob van Rijswijk

Jacob van Rijswijk 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).

  • Fluid containing string with opening to pass fluid from core
    Patent number: 4499144
    Abstract: This invention relates to a string for sports rackets which comprises a core (1), the core being constituted by one or more synthetic polymeric monofilaments, the, or at least one of the monofilaments having a longitudinal bore (2), and, along the length of the bore, one or more openings (3) for the passage of fluid from the bore, the core being covered by a wrapping (9,10) of synthetic polymeric material (FIGS. 7 and 8).
    Type: Grant
    Filed: January 13, 1983
    Date of Patent: February 12, 1985
    Assignee: Jacotra A. G.
    Inventor: Jacob van Rijswijk