Patents by Inventor Ian Stuart McColl

Ian Stuart McColl 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).

  • Chlorinated hydrocarbons
    Patent number: 3993705
    Abstract: Vinylidene chloride containing dichloroacetylene as an impurity is purified by treatment with a solution of a sulphide, polysulphide or hydrosulphide, for example an aqueous solution of ammonium hydrosulphide, sodium hydrosulphide or potassium hydrosulphide. The impure vinylidene chloride may be treated with the solution of sulphide, hydrosulphide, or polysulphide after isolation from the reaction mixture in which it is formed, or the vinylidene chloride may be treated in situ in the reaction mixture before isolation.
    Type: Grant
    Filed: March 7, 1975
    Date of Patent: November 23, 1976
    Assignee: Imperial Chemical Industries Limited
    Inventors: Ian Stuart McColl, Ashley Cedric Pardoe Pugh