Patents by Inventor Geoffrey E. Ficken

Geoffrey E. Ficken 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).

  • Monomethine compounds
    Patent number: 4996141
    Abstract: Compounds of the formula ##STR1## where A represents the atoms necessary to complete a benzoxazole or naphthoxazole ring which is optionally substituted, R.sub.1 and R.sub.2 are each alkyl, hydroxyalkyl or alkoxy alkyl groups wherein the alkyl moiety comprises 1 to 4 carbon atoms, R.sub.3, R.sub.4, R.sub.5 and R.sub.6 are each hydrogen atoms or alkyl groups having 1 to 4 carbon atoms or phenyl groups, and X is an anion.
    Type: Grant
    Filed: January 11, 1989
    Date of Patent: February 26, 1991
    Assignee: Ilford Limited
    Inventors: Geoffrey E. Ficken, Douglas J. Edwards, Clive W. Mowforth, Trevor J. Maternaghan, Rolf Steiger, Victor W. Dolden
  • Optical sensitizing dyes
    Patent number: 4804599
    Abstract: Dyes of the formula ##STR1## wherein Y completes a benzothiazole or benzoselenazole nucleus, R.sub.1 is alkyl, R.sub.2 and R.sub.3 are hydrogen, alkyl or phenyl and Z is alkylene, are suitable for sensitizing fine grain silver halide emulsions.
    Type: Grant
    Filed: May 24, 1988
    Date of Patent: February 14, 1989
    Assignee: Ciba-Geigy AG
    Inventor: Geoffrey E. Ficken
  • Tetra-aza indene compounds
    Patent number: 4728601
    Abstract: Tetra-aza indene compounds of the formula ##STR1## wherein R.sub.1 is alkyl or a ring system and R.sub.2 and R.sub.3 are hydrogen or alkyl.These compounds are of use as image toners in photographic materials.
    Type: Grant
    Filed: April 1, 1986
    Date of Patent: March 1, 1988
    Assignee: Ciba-Geigy AG
    Inventors: David Rowland, Michael E. Dale, Geoffrey E. Ficken, William E. Long, Andrew W. Yates
  • Preparation of sulphoalkyl quaternary salts
    Patent number: 4287348
    Abstract: Sulphoalkyl quaternary salts of the formula ##STR1## wherein X is --O--, --Se--, --S--, --NR-- or --CR(R)--, R is hydrogen or alkyl, R.sub.1 is hydrogen, methyl or ethyl, R.sub.2 and R.sub.3 are each hydrogen or substituents or together represent the atoms necessary to complete an optionally substituted benzene ring, R.sub.4 is optionally substituted alkylene of 3 or 4 carbon atoms and n is 1 or 0, except that when n is 1, R.sub.1 cannot be hydrogen, are prepared by heating at a temperature above 80.degree. C. a heterocyclic base of the formula ##STR2## wherein X, R.sub.1, R.sub.2, R.sub.3 and n have the indicated meanings with a hydroxysulphonic acid of the formula HOR.sub.4 SO.sub.3 H.
    Type: Grant
    Filed: June 5, 1978
    Date of Patent: September 1, 1981
    Assignee: Ciba-Geigy AG
    Inventors: Rainer Kitzing, Geoffrey E. Ficken, Victor W. Dolden
  • Spectral sensitization of photographic material and new spectral sensitizers
    Patent number: 4138551
    Abstract: The present invention relates to light-sensitive photographic material with a light-sensitive heavy metal compound, e.g. a silver halide, and a spectral sensitizer. The spectral sensitizer is a compound in which the radicals of a sensitizing dyestuff are covalently bonded to amino, imino, hydroxyl, mercapto, carboxylic acid or carboxylic acid amide groups of a natural hydrophilic colloid, preferably gelatin.The invention also relates to new sensitizing dyes which are dinuclear cyanine dyes or merocyanine dyes which have attached either to a heterocyclic nucleus of the dye or to its methine chain a group which is reactive with a hydrophilic colloid.
    Type: Grant
    Filed: March 25, 1977
    Date of Patent: February 6, 1979
    Assignee: Ciba-Geigy AG
    Inventors: Rolf Steiger, Jean-Francois Reber, Aaron D. Ezekiel, Geoffrey E. Ficken