Patents Assigned to Jacotra A. G.
  • 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