Patents by Inventor Graham Bowmaker

Graham Bowmaker 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).

  • Bis-phosphonium salts and process for making them
    Patent number: 4620020
    Abstract: Novel bis-phosphonium salts of the general formula ##STR1## in which R.sup.1 stands for a straight or branched alkyl group having from 1 to 12 carbon atoms,R.sup.2 stands for methyl, ethyl, n-propyl or iso-propyl, andX.sup..crclbar. stands for a monovalent anion or complex anion, or2 X.sup..crclbar. stands for a bivalent inorganic anion, are made.To this end, a triorganylphosphonium alkylide of the general formula R.sub.3.sup.1 P=CHR.sup.2 is reacted with an anhydrous copper(II)-halide in a solvent at temperatures of -78.degree. C. to 0.degree. C. with agitation, precipitated bis-phosphonium dihalogenocuprate(I) is separated and, if desired, converted by metathesis into another bis-phosphonium salt.
    Type: Grant
    Filed: April 4, 1985
    Date of Patent: October 28, 1986
    Assignee: Hoecht Aktiengesellschaft
    Inventors: Hubert Schmidbaur, Cornelia Dorzbach, Graham Bowmaker