Patents by Inventor Wanda S. Smith

Wanda S. Smith 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).

  • Preparation of phosphonium phenoxide salts
    Patent number: 4340761
    Abstract: A tetrahydrocarbylphosphonium phenoxide salt is prepared by reacting a tetrahydrocarbylphosphonium halide salt with an alkali metal or ammonium hydroxide in a liquid reaction medium in the presence of at least an equivalent amount of a phenol. This method of preparation is especially effective where the hydroxide salt of the tetrahydrocarbylphosphonium is unstable. For example, benzyltriphenylphosphonium salt of bisphenol A complexed with bisphenol A is prepared by adding 1 equivalent of sodium hydroxide to a methanol solution containing 1 equivalent of benzyltriphenylphosphonium bromide and 2 equivalents of bisphenol A at 30.degree. C.
    Type: Grant
    Filed: November 24, 1980
    Date of Patent: July 20, 1982
    Assignee: The Dow Chemical Company
    Inventors: George A. Doorakian, Wanda S. Smith