Patents by Inventor Richard Helmut Wunder

Richard Helmut Wunder 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).

  • Latex coagulation process using lignin compound
    Patent number: 4025711
    Abstract: Synthetic styrene-conjugated diolefin polymers, e.g. SBR rubbers, are recovered from their aqueous polymerization emulsion by coagulation with acid and a lignin compound. The conventional use of sodium chloride as a coagulant is avoided so as to overcome the problem of sodium chloride in the effluent. By this process of the invention, a rubber crumb of increased porosity is obtained, which is easier to dry.
    Type: Grant
    Filed: March 8, 1976
    Date of Patent: May 24, 1977
    Assignee: Polysar Limited
    Inventors: Melvin John George Davidson, Richard Helmut Wunder