Patents by Inventor Askan Hertwig

Askan Hertwig 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).

  • Curing agent for polysulfide-polymer compositions
    Patent number: 4104189
    Abstract: Activated manganese (IV) oxide is used as a curing and vulcanizing agent for polysulfide polymers. By adjusting the following parameters the properties as a curing and vulcanizing agent can be influenced in a predictable way: (a) alkali metal content or foreign metal content; (b) water content; (c) specific surface. A process is described to adjust these parameters.
    Type: Grant
    Filed: December 16, 1976
    Date of Patent: August 1, 1978
    Assignee: Riedel-de Haen Aktiengesellschaft
    Inventors: Askan Hertwig, Horst Krampitz