Patents by Inventor Cary S. Marshall

Cary S. Marshall 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).

  • Electrolytic preparation of 3,6-dichloropicolinic acid
    Patent number: 4497697
    Abstract: The rate of production of 3,6-dichloropicolinic acid by reduction of tetrachloropicolinic acid in basic aqueous solution in a given cell can be considerably increased if a trichloropicolinic acid is added to the tetrachloropicolinic acid feed in substantially greater proportions than can result from in-situ reduction of the tetrachloro acid. Preferably, the trichloro acid is obtained by acid hydrolysis of by-products of symmetrical tetrachloropyridine manufacture by chlorination/chlorinolysis of 6-chloro-2-(trichloromethyl)pyridine.
    Type: Grant
    Filed: March 2, 1984
    Date of Patent: February 5, 1985
    Assignee: The Dow Chemical Company
    Inventors: Cary S. Marshall, Scott D. Troyer
  • Non-solvent precipitation of polymer composition
    Patent number: 4182850
    Abstract: Production of polycarbonate or phenolphthalein polycarbonate copolymers and method for recovery of solid copolymer from solution.
    Type: Grant
    Filed: December 19, 1977
    Date of Patent: January 8, 1980
    Assignee: The Dow Chemical Company
    Inventors: Cary S. Marshall, Robert S. Steffanson