Patents by Inventor Barbara Wildenhain

Barbara Wildenhain 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).

  • Patent number: 4401520
    Abstract: This invention relates to an improvement in the process for the preparation of screen printing stencils by an electroplating method, which comprises coating a metallic matrix, provided in the manner of a screen with dots of insulating material, with a photoresist layer, exposing the photoresist layer imagewise and developing it by washing out, and rendering those areas of the photoresist layer which have remained in place electrically conductive in the course of imaging, electrodepositing metal up to a desired height on the conductive image stencil and on the matrix ridges surrounding the insulating screen dots, and removing the patterned screen printing stencil thus obtained from the matrix, the improvement which comprises rendering the photoresist layer conductive only on its surface and before developing.
    Type: Grant
    Filed: March 18, 1981
    Date of Patent: August 30, 1983
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Steppan, Barbara Wildenhain, Hans Ruckert
  • Patent number: 4093464
    Abstract: A light-sensitive layer transfer material and such layer disposed on a carrier, for use in screen-printing stencils, printed circuit boards, integrated circuits, intaglio printing plates, relief printing plates, proof prints and the like, which comprises an alkali-soluble phenolic resin, such as phenol-formaldehyde novolacs, an ester or an amide of an o-naphthoquinone-diazide sulphonic acid, such as the p-cumyl phenyl ester of 1,2-naphthoquinone-2-diazide-4-sulphonic acid, etc., and an acrylic resin, such as a polymer of an alkyl ester of acrylic acid or methacrylic acid.
    Type: Grant
    Filed: July 26, 1973
    Date of Patent: June 6, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hans Ruckert, Barbara Wildenhain