Patents by Inventor Robert A Dorvel

Robert A Dorvel 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).

  • Fine grain niobium sheet via ingot metallurgy
    Patent number: 7666243
    Abstract: A method of making a silicon-containing alloy of niobium that includes: A) forming a blend comprising niobium powder and silicon powder and pressing the blend to form pressed blend; B) attaching the pressed blend to an electrode comprising niobium; C) melting the electrode and pressed blend under vacuum arc remelting conditions, such that the blend mixes with the melted electrode; D) cooling the melted electrode to form an alloy ingot; and E) applying thermo-mechanical processing steps to the alloy ingot to form a wrought product. The method provides a fully recrystalized niobium wrought product with a grain size finer that ASTM 5, that can be used to make deep drawn cups and sputtering targets.
    Type: Grant
    Filed: October 27, 2004
    Date of Patent: February 23, 2010
    Assignee: H.C. Starck Inc.
    Inventors: Paul R. Aimone, Kurt D. Moser, Robert A. Dorvel, Ryan Balter
  • Fine grain niobium sheet via ingot metallurgy
    Publication number: 20060086438
    Abstract: A method of making a silicon-containing alloy of niobium or tantalum that includes: A) forming a blend comprising niobium or tantalum powder and silicon powder and pressing the blend to form pressed blend; B) attaching the pressed blend to an electrode comprising niobium or tantalum; C) melting the electrode and pressed blend under vacuum arc remelting conditions, such that the blend mixes with the melted electrode; D) cooling the melted electrode to form an alloy ingot; and E) applying thermo-mechanical processing steps to the alloy ingot to form a wrought product. The method provides a fully recrystalized niobium or tantalum wrought product with a grain size finer that ASTM 5, that can be used to make deep drawn cups and sputtering targets.
    Type: Application
    Filed: October 27, 2004
    Publication date: April 27, 2006
    Inventors: Paul Aimone, Kurt Moser, Robert Dorvel, Ryan Balter
  • Refining of tantalum and tantalum scrap with carbon
    Patent number: 6197082
    Abstract: Tantalum scrap of high oxygen content is recovered and processed to metallurgical grade tantalum by fine participation. Blending with carbon or other appropriate solid reducing agent, melting in a plasma furnace (20) at about tantalum melt temperature while suppressing partial pressure of tantalum oxide gas to minimize tantalum loss of the process.
    Type: Grant
    Filed: February 17, 1999
    Date of Patent: March 6, 2001
    Assignee: H.C. Starck, Inc.
    Inventors: Robert A Dorvel, Leonid N. Shekhter, Ross W. Simon
  • Low toxicity corrosion resistant solder
    Patent number: 4778733
    Abstract: An article of manufacture, such as is used in plumbing, is formed by soldering copper workpieces together with a lead-free solder having a tin content of from about 92 to 99%, a copper content of from about 0.7 to 6% and a silver content of from about 0.05-3%, by weight.
    Type: Grant
    Filed: July 3, 1986
    Date of Patent: October 18, 1988
    Assignee: Engelhard Corporation
    Inventors: Alfonso T. Lubrano, Thomas S. Bannos, Malcolm Warren, Robert A. Dorvel