Patents by Inventor William J. S. Craigen

William J. S. Craigen 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).

  • Uranium dioxide process
    Patent number: 4035468
    Abstract: Process for the preparation of fine particle size uranium dioxide from a uranium trioxide feed comprising the following steps:A. reacting solid uranium trioxide with aqueous ammonium nitrate to form an insoluble ammonium uranateB. neutralizing the thus formed slurry with ammonium hydroxide to precipitate out as an insoluble ammonium uranate the remaining dissolved uraniumC. recovering the thus formed precipitates in a dry state andD. reducing the dried precipitate to uranium dioxide.
    Type: Grant
    Filed: February 26, 1976
    Date of Patent: July 12, 1977
    Assignee: Eldorado Nuclear Limited
    Inventors: William J. S. Craigen, Tadeusz W. Zawidzki, Bruce C. Smart, Frank W. Melvanin