Patents by Inventor Kenneth M. McCombe

Kenneth M. McCombe 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).

  • Processing of photographic silver halide materials
    Patent number: 4948714
    Abstract: Method of processing photographic silver halide material wherein an imagewise release of the development inhibitor 1-aryltetrazole-5-thiol is achieved during processing.
    Type: Grant
    Filed: August 22, 1989
    Date of Patent: August 14, 1990
    Assignee: Ilford Limited
    Inventors: William E. Long, Kenneth M. McCombe, Marion R. Palmer, Terence C. Webb
  • Protected developing agents
    Patent number: 4560646
    Abstract: Compounds of the formula ##STR1## wherein L is a direct bond or consists of a chain of carbon atoms or of a divalent ring system, R.sub.1 to R.sub.4 are hydrogen or alkyl, R.sub.5 or R.sub.6 are hydrogen, alkyl or aryl, or R.sub.5 together with R.sub.6 complete a ring system, and R.sub.7 is hydrogen or a group of the formula ##STR2## wherein L, R.sub.5 and R.sub.6 are as defined. These compounds are useful developing agents for activation processing.
    Type: Grant
    Filed: November 21, 1984
    Date of Patent: December 24, 1985
    Assignee: Ciba Geigy AG
    Inventors: William E. Long, Norman A. Smith, Terence C. Webb, Stephen R. Postle, Kenneth M. McCombe, Martin C. Grossel