Patents by Inventor Lympexios N. Yannopoulos

Lympexios N. Yannopoulos 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).

  • Synthetic monazite coated nuclear waste containing glass
    Patent number: 4488990
    Abstract: A method is disclosed for stabilizing glass which contains nuclear waste by coating the glass with synthetic monazite. The synthetic monazite has a composition of about 30 to about 35% Ce.sub.2 O.sub.3, about 31 to about 36% La.sub.2 O.sub.3, about 27 to about 35% P.sub.2 O.sub.5, and about 2 to about 5% Nd.sub.2 O.sub.3, where the percentage of La.sub.2 O.sub.3 is about 0.5 to about 1.5 percentage points greater than the percentage of Ce.sub.2 O.sub.3. The coating can be applied by detonation gun or by chemical vapor deposition. Chemical vapor deposition can be accomplished by heating halides of La, Ce, Nd, and P or PO and bringing the vapors by carrier gas to the glass where they are contacted by an oxidizing gas such as carbon dioxide, oxygen, steam, or air.
    Type: Grant
    Filed: February 15, 1983
    Date of Patent: December 18, 1984
    Assignee: Westinghouse Electric Corp.
    Inventor: Lympexios N. Yannopoulos
  • Synthetic monazite coated nuclear waste containing glass
    Patent number: 4382974
    Abstract: A method is disclosed for stabilizing glass which contains nuclear waste by coating the glass with synthetic monazite. The synthetic monazite has a composition of about 30 to about 35% Ce.sub.2 O.sub.3, about 31 to about 36% La.sub.2 O.sub.3, about 27 to about 35% P.sub.2 O.sub.5, and about 2 to about 5% Nd.sub.2 O.sub.3, where the percentage of La.sub.2 O.sub.3 is about 0.5 to about 1.5 percentage points greater than the percentage of Ce.sub.2 O.sub.3. The coating can be applied by detonation gun or by chemical vapor deposition. Chemical vapor deposition can be accomplished by heating halides of La, Ce, Nd, and P or PO and bringing the vapors by carrier gas to the glass where they are contacted by an oxidizing gas such as carbon dioxide, oxygen, steam, or air.
    Type: Grant
    Filed: March 19, 1981
    Date of Patent: May 10, 1983
    Assignee: Westinghouse Electric Corp.
    Inventor: Lympexios N. Yannopoulos