Patents by Inventor Karl Seff

Karl Seff 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).

  • Method of manufacture of molecular sieves
    Patent number: 6583081
    Abstract: Zeolites exchanged with lithium, rubidium, cesium cations and trivalent cations are prepared by first partially, fully or excessively ion-exchanging a sodium-containing zeolite, a potassium-containing zeolite or a sodium- and potassium-containing zeolite with trivalent cations, then calcining the partially, fully or excessively trivalent cation-exchanged zeolite, and then ion exchanging the calcined zeolite with lithium rubidium, cesium cations, thereby replacing hydrogen and any sodium and/or potassium cations remaining in the zeolite with lithium, rubidium, cesium cations, whereby trivalent cations present in the zeolite will not be substantially replaced by the lithium ions.
    Type: Grant
    Filed: February 1, 2001
    Date of Patent: June 24, 2003
    Assignee: The BOC Group, Inc.
    Inventors: Karl Seff, Hyun Sook P. Cordes, Martin Bülow, Frank R. Fitch, Adeola F. Ojo, Sudhakar R. Jale, Dongmin Shen
  • Method of manufacture of molecular sieves
    Publication number: 20020072468
    Abstract: Zeolites exchanged with lithium, rubidium, cesium cations and trivalent cations are prepared by first partially, fully or excessively ion-exchanging a sodium-containing zeolite, a potassium-containing zeolite or a sodium- and potassium-containing zeolite with trivalent cations, then calcining the partially, fully or excessively trivalent cation-exchanged zeolite, and then ion exchanging the calcined zeolite with lithium rubidium, cesium cations, thereby replacing hydrogen and any sodium and/or potassium cations remaining in the zeolite with lithium, rubidium, cesium cations, whereby trivalent cations present in the zeolite will not be substantially replaced by the lithium ions.
    Type: Application
    Filed: February 1, 2001
    Publication date: June 13, 2002
    Inventors: Karl Seff, Hyun Sook P. Cordes, Martin Bulow, Frank R. Fitch, Adeola F. Ojo, Sudhakar R. Jale, Dongmin Shen