Patents by Inventor Hans J. Schafer

Hans J. Schafer 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).

  • Apparatus for coating circuit boards
    Patent number: 5421884
    Abstract: In a curtain pouring apparatus for coating circuit boards with a photopolymerizable lacquer, the improvement comprising a heatable roll disposed in a gutter heatable vat above a conveyor belt for the circuit boards and a heatable doctor blade is applied against the roll and infrared lamps are arranged parallel to the doctor blade.
    Type: Grant
    Filed: March 1, 1994
    Date of Patent: June 6, 1995
    Assignee: Hans Jurgen Schafer
    Inventor: Hans J. Schafer
  • Method for coating circuitboards
    Patent number: 5336529
    Abstract: Bubble-free solder stop lacquer coatings of circuitboards are obtained for high conductor runs and close spacing, in that one proceeds from a photopolymerizable low-solvent lacquer, which is heated to pouring viscosity through a heatable roll and doctor blade by means of infrared lamps and is poured onto cooled circuitboards as a lacquer curtain.
    Type: Grant
    Filed: March 9, 1993
    Date of Patent: August 9, 1994
    Assignee: Rutgerswerke Aktiengesellschaft
    Inventor: Hans J. Schafer