Patents by Inventor Gerrit H. Van der Klashorst

Gerrit H. Van der Klashorst 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).

  • Lignin derivative polymers
    Patent number: 4769434
    Abstract: A polymer material of the product of reaction of a grass plant lignin derivative comprising lignin polymer fragments recovered from black liquor obtained in the pulping of grass plant material and containing an average of more than 0.4 sites per phenyl propane unit of the polymer fragments reactive to base catalyzed substitution and condensation reactions, with an electrophilic compound which is capable of reacting twice at one side or at least once at each of two different sites.
    Type: Grant
    Filed: June 17, 1986
    Date of Patent: September 6, 1988
    Assignee: South African Inventions Development Corporation
    Inventors: Gerrit H. Van der Klashorst, Antonio Pizzi, Flora-Anne Cameron