Patents by Inventor Bohuslav V. Kokta

Bohuslav V. Kokta 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).

  • Process for chemical treatment of discontinuous cellulosic fibers and composites of polyethylene and treated fibers
    Patent number: 5120776
    Abstract: Cellulosic fibers were pre-treated with maleic anhydride or phthalic anhydride in the presence of an intitiator to improve the bonding and dispersibility of the fibers in the polymer matrix. High density polyethylene (HDPE) was filled with chemically treated chemithermomechanical pulp (CTMP) and wood flour. Composites of HDPE-pre-treated wood fibers, characterized at different fiber ratios, produced superior mechanical properties than the untreated fiber composites. These composites can be compression or injection molded to produce useful articles.
    Type: Grant
    Filed: April 13, 1990
    Date of Patent: June 9, 1992
    Inventors: Govinda Raj, Bohuslav V. Kokta
  • Bonded composites of cellulose fibers polyethylene
    Patent number: 4791020
    Abstract: Composites are made from cellulose fibers dispersed in a matrix of polyethylene and an isocyanate and bonded thereto during subsequent extrusion and or molding. The isocyanate improves adhesion between the cellulose fibers and the polyethylene. The improved adhesion results in improved tensile properties in the composite.
    Type: Grant
    Filed: February 2, 1987
    Date of Patent: December 13, 1988
    Assignee: Novacor Chemicals Ltd.
    Inventor: Bohuslav V. Kokta