Patents by Inventor Bernardus M. Koenders

Bernardus M. Koenders 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).

  • Fibres and yarns from a blend of aromatic polyamides
    Patent number: 4835223
    Abstract: Fibres consisting wholly or substantially of a mixture of poly-p-phenylene terephthalamide and an aromatic copolyamide. They display an improved tensile strength and elongation at break if the mixture contains, as the copolyamide, (2-25% b.w. of) a polycondensation product of terephthalic acid, p-phenylene diamine and a monomer selected from the group consisting of piperazine, benzidine and 1,4-diamino anthraquinone. The fibres are particularly suitable for use in the manufacture of tire yarn.
    Type: Grant
    Filed: September 12, 1988
    Date of Patent: May 30, 1989
    Assignee: Akzo N.V.
    Inventors: Hendrik Maatman, Bernardus M. Koenders
  • Fibers and yarns from a blend of aromatic polyamides
    Patent number: 4783367
    Abstract: Fibers made from a blend of poly-p-phenylene terephthalamide (PPDT) and a copolyamide derived from p-phenylene diamine, terephthalic acid and a naphthalenic difunctional monomer show improved properties, particularly tenacity, compared with PPDT fibers. The blend can be processed in the same manner as the PPDT polymer.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: November 8, 1988
    Assignee: Akzo N.V.
    Inventors: Hendrik Maatman, Bernardus M. Koenders, Franciscus A. M. Schenkels