Patents by Inventor Ian L. Madden

Ian L. Madden 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).

  • Patent number: 4348372
    Abstract: Calcium chloride hydrates are recovered from calcium hypochlorite process effluents comprised of an aqueous solution of calcium chloride, calcium hypochlorite, and calcium chlorate in a process which comprises acidifying the effluent with a chlorine-containing compound selected from the group consisting of chlorine, hydrochloric acid and hydrogen chloride to form an acidic aqueous solution of calcium chloride having reduced concentrations of calcium hypochlorite. Water is evaporated from the acidic aqueous solution to produce a concentrated acidic aqueous solution containing at least 45 percent by weight of calcium chloride. The concentrated acidic aqueous solution of calcium chloride is fed to a crystallizer to form crystals of a calcium chloride hydrate. The calcium chloride hydrate crystals are separated from a mother liquor and recovered.The process is used to produce calcium chloride hexahydrate, calcium chloride tetrahydrate or calcium chloride dihydrate.
    Type: Grant
    Filed: May 4, 1981
    Date of Patent: September 7, 1982
    Assignee: Olin Corporation
    Inventors: Budd L. Duncan, Ian L. Madden