Patents by Inventor Guiseppe Colella

Guiseppe Colella 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).

  • Melting and casting of high purity chromium with controlled oxygen content
    Patent number: 6039788
    Abstract: The present invention relates to a method of manufacturing high purity chromium suitable for deposition onto a semiconductor wafer or other substrate by sputtering. The process increases productivity, expands melting capability and provides consistent high purity chromium by reducing contamination by the dissolution of crucible material. The present invention provides for the addition of chromium oxide (Cr.sub.2 O.sub.3) to control oxygen content in chromium thereby producing high purity chromium ingots and protecting the ceramic crucibles from chemical attack by the liquid chromium.
    Type: Grant
    Filed: April 9, 1998
    Date of Patent: March 21, 2000
    Assignees: Sony Corporation, Materials Research Corporation
    Inventors: Raymond K. F. Lam, Charles E. Melin, Guiseppe Colella
  • High purity chromium metal by casting with controlled oxygen content
    Patent number: 5866067
    Abstract: The present invention relates to high purity chromium metal suitable for deposition onto a semiconductor wafer or other substrate by sputtering. The high purity chromium metal is produced by a process that increases productivity, expands melting capability and provides consistent high purity chromium by reducing contamination by the dissolution of crucible material. The present invention provides high purity chromium by the addition of chromium oxide (Cr.sub.2 O.sub.3) to molten chromium to control oxygen content in the chromium thereby producing high purity chromium ingots and protecting the ceramic crucibles from chemical attach by the liquid chromium.
    Type: Grant
    Filed: March 24, 1997
    Date of Patent: February 2, 1999
    Assignee: Sony Corporation and Materials Research Corporation
    Inventors: Raymond K. F. Lam, Charles E. Melin, Guiseppe Colella