Patents by Inventor Gerald C. Jan

Gerald C. Jan 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).

  • Azo dyes for photographic silver dye bleach material
    Patent number: 5043257
    Abstract: Azo dyes of the formula ##STR1## where X is alkyl or alkoxy each of 1 to 4 carbon atoms or halogen, X' is hydrogen, alkyl or alkoxy each of 1 to 4 carbon atoms or halogen, Y and Y' are independently of each other hydrogen or halogen, Z is hydrogen, alkyl or alkoxy or alkylthio each of 1 to 4 carbon atoms, or halogen, M is a 1-, 2- or 3-valent metal cation, ammonium or an organic ammonium compound, m is 1, 2 or 3 and n is 2 to 10, are suitable for use as image dyes in photographic silver dye bleach materials.The dyes of the invention can also be used to dye textile materials.
    Type: Grant
    Filed: December 8, 1989
    Date of Patent: August 27, 1991
    Assignee: Ilford Limited
    Inventors: Kurt Baettig, Gerald C. Jan