Patents by Inventor Hans Werner Frass

Hans Werner Frass 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).

  • Radiation-sensitive copying composition
    Patent number: 4101323
    Abstract: This invention relates to a radiation-sensitive copying composition comprising a compound (1) which splits-off an acid upon irradiation and a compound (2) having at least one group selected from the group consisting of a carboxylic ortho acid ester group and a carboxylic acid amide acetal group, which composition, upon irradiation, forms an exposure product having a higher solubility in a liquid developer than the non-irradiated composition.
    Type: Grant
    Filed: March 24, 1976
    Date of Patent: July 18, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gerhard Buhr, Hans Ruckert, Hans Werner Frass