Patents by Inventor Victor W. Dolden

Victor W. Dolden 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
  • 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