Patents by Inventor August P. Doering

August P. Doering 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).

  • Uniform exposure of positive-acting diazo type materials through support
    Patent number: 4250242
    Abstract: This invention relates to an improvement in a material adapted for imagewise exposure to actinic light comprising a transparent or translucent support having a positive-acting quinone diazide light-sensitive coating composition in direct contact with one surface thereof, the improvement comprising that the surface of said coating in direct contact with said support is substantially photodecomposed, and that a gradient exists in said coating wherein the percentage of undecomposed light-sensitive quinone diazide increases with increasing distance from said support. The invention also relates to a method for preparing the novel material.
    Type: Grant
    Filed: October 31, 1978
    Date of Patent: February 10, 1981
    Assignee: American Hoechst Corporation
    Inventor: August P. Doering
  • Positive-acting diazo type materials having photodecomposed gradient
    Patent number: 4154613
    Abstract: This invention relates to an improvement in a material adapted for imagewise exposure to actinic light comprising a transparent or translucent support having a positive-acting quinone diazide light-sensitive coating composition in direct contact with one surface thereof, the improvement comprising that the surface of said coating in direct contact with said support is substantially photodecomposed, and that a gradient exists in said coating wherein the percentage of undecomposed light-sensitive quinone diazide increases with increasing distance from said support. The invention also relates to a method for preparing the novel material.
    Type: Grant
    Filed: July 13, 1977
    Date of Patent: May 15, 1979
    Assignee: American Hoechst Corporation
    Inventor: August P. Doering