Patents by Inventor Britta Maisel

Britta Maisel 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).

  • Positive-working photosensitive mixture and photolithographic copying material produced therefrom with o-quinone dialide sulfonyl ester and azo coupler
    Patent number: 4929534
    Abstract: A positive-working photosensitive mixture containing an o-quinone diazide and a binder is disclosed wherein the mixture contains a compound which is able to form an azo coupling with the o-quinone diazide. A copying material produced with the photosensitive mixture has a high photosensitivity and an exceptional developer resistance. The photosensitive mixture is used in reproduction technique, and also in the field of resists.
    Type: Grant
    Filed: August 26, 1988
    Date of Patent: May 29, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Trutz-Ulrich Stephani, Dieter Mohr, Britta Maisel, Werner Frass