Patents by Inventor Walter Heierli

Walter Heierli 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).

  • Color photographic recording material
    Patent number: 4026709
    Abstract: The present invention relates to new compounds having an active methylene group or phenolic hydroxyl group and therefore capable of being used as photographic color couplers. The new compounds contain at least one radical of a phosphoric acid diester, phosphonic acid diester, phosphoric acid diamide, phosphonic acid diamide, phosphoric acid ester-amide or phosphonic acid ester-amide.
    Type: Grant
    Filed: April 19, 1976
    Date of Patent: May 31, 1977
    Assignee: Ciba-Geigy AG
    Inventors: Bernhard Piller, Paul Tschopp, Thomas Stauner, Walter Heierli
  • Color photographic recording material
    Patent number: 3984432
    Abstract: The present invention relates to new compounds having an active methylene group or phenolic hydroxyl group and therefore capable of being used as photographic color couplers. The new compounds contain at least one radical of a phosphoric acid diester, phosphonic acid diester, phosphoric acid diamide, phosphonic acid diamide, phosphoric acid ester-amide or phosphonic acid ester-amide.
    Type: Grant
    Filed: February 27, 1974
    Date of Patent: October 5, 1976
    Assignee: Ciba-Geigy AG
    Inventors: Bernhard Piller, Paul Tschopp, Thomas Stauner, Walter Heierli