Patents by Inventor Lothar Zapf

Lothar Zapf 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).

  • Phenylquinoxaline copolymers
    Patent number: 5278277
    Abstract: Phenylquinoxaline copolymers of the general formula: ##STR1## are described where R* signifies a polar unit. The application of these copolymers for producing highly heat-resistant dielectrics is also described.
    Type: Grant
    Filed: November 25, 1992
    Date of Patent: January 11, 1994
    Assignee: Siemens Aktiengesellschaft
    Inventors: Hellmut Ahne, Lothar Zapf