Patents by Inventor Yuri L. Pozdeev-Freeman

Yuri L. Pozdeev-Freeman 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).

  • Sintered Tantalum and Niobium capacitor pellets doped with Nitrogen, and method of making the same
    Patent number: 6447570
    Abstract: A pellet for use in electrolytic capacitors is comprised of a powder selected from one of Tantalum and Niobium. The pellet is porous, free from oxygen, annealed by heat, and diffused with nitrogen with all these attributes being achieved in an oxygen free environment. The method of producing the pellet involves the steps of taking a powder selected from one of Tantalum and Niobium pressing the powder into a self-contained pellet; removing any oxygen in the pellet; annealing the pellet; and subjecting the pellet to nitrogen gas so that the nitrogen diffuses into the pellet to reduce DLC, with all these steps taking place in an oxygen free environment.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: September 10, 2002
    Assignee: Vishay Sprague, Inc.
    Inventor: Yuri L. Pozdeev-Freeman
  • Sintered Tantalum and Niobium capacitor pellets doped with Nitrogen, and method of making the same
    Publication number: 20020101645
    Abstract: A pellet for use in electrolytic capacitors is comprised of a powder selected from one of Tantalum and Niobium. The pellet is porous, free from oxygen, annealed by heat, and diffused with nitrogen with all these attributes being achieved in an oxygen free environment. The method of producing the pellet involves the steps of taking a powder selected from one of Tantalum and Niobium pressing the powder into a self-contained pellet; removing any oxygen in the pellet; annealing the pellet; and subjecting the pellet to nitrogen gas so that the nitrogen diffuses into the pellet to reduce DLC, with all these steps taking place in an oxygen free environment.
    Type: Application
    Filed: November 30, 2000
    Publication date: August 1, 2002
    Inventor: Yuri L. Pozdeev-Freeman
  • Method for doping sintered tantalum and niobium pellets with nitrogen
    Patent number: 6410083
    Abstract: A method of doping tantalum and niobium pellets with nitrogen is described wherein the resulting pellets are substantially free of nitride precipitate on their outer surfaces. The method includes the step of heating the pellets to a temperature of from about 600-1400° C. in a nitrogen gas atmosphere and then in a vacuum which causes nitrogen contacting a pellet to diffuse into the inner portion of the pellet instead of forming a precipitate. The resulting pellets have improved DCL stability and reliability in comparison to prior art nitrogen-doped tantalum and niobium pellets.
    Type: Grant
    Filed: February 25, 2000
    Date of Patent: June 25, 2002
    Assignee: Vishay Sprague, Inc.
    Inventor: Yuri L. Pozdeev-Freeman
  • Method for making capacitor pellet and lead assembly
    Patent number: 6319292
    Abstract: A capacitor includes a porous pellet formed from compressed conductive particles. The pellet has a lead receiving external surface. The conductive particles at the lead receiving surface are fused together to create a fused layer on the external surface of the pellet. A lead wire has one of its ends welded to the fused layer on the surface of the pellet. The fused layer is formed by exposing it to high temperatures, preferably by use of a laser beam.
    Type: Grant
    Filed: June 5, 2000
    Date of Patent: November 20, 2001
    Assignee: Vishay Sprague, Inc.
    Inventors: Yuri L. Pozdeev-Freeman, Boris Levi, Semion Akselrod
  • Capacitor pellet and lead assembly
    Patent number: 6212065
    Abstract: A capacitor includes a porous pellet formed from compressed conductive particles. The pellet has a lead receiving external surface. The conductive particles at the lead receiving surface are fused together to create a fused layer on the external surface of the pellet. A lead wire has one of its ends welded to the fused layer on the surface of the pellet. The fused layer is formed by exposing it to high temperatures, preferably by use of a laser beam.
    Type: Grant
    Filed: April 1, 1999
    Date of Patent: April 3, 2001
    Assignee: Vishay Sprague, Inc.
    Inventors: Yuri L. Pozdeev-Freeman, Boris Levi, Semion Akselrod
  • Method for doping sintered tantalum and niobium pellets with nitrogen
    Patent number: 6185090
    Abstract: Doped tantalum and niobium pellets with nitrogen is described wherein the resulting pellets are substantially free of nitride precipitate on their outer surfaces. The tantalum and niobium pellets are formed by heating the pellets to a temperature of from about 600-1400° C. in a nitrogen gas atmosphere and then in a vacuum which causes nitrogen contacting a pellet to diffuse into the inner portion of the pellet instead of forming a precipitate. The resulting pellets have improved DCL stability and reliability in comparison to prior art nitrogen-doped tantalum and niobium pellets.
    Type: Grant
    Filed: September 3, 1998
    Date of Patent: February 6, 2001
    Assignee: Vishay Sprague, Inc.
    Inventor: Yuri L. Pozdeev-Freeman