Patents by Inventor Joseph A. Shrawder

Joseph A. Shrawder 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).

  • Sodium halide discharge lamp
    Patent number: 5729090
    Abstract: A sodium containing lamp constructed to include of a fused quartz or fused silica arc chamber wherein the fused quartz and/or fused silica contains less than about 0.05 parts per million sodium. The arc chamber of the invention demonstrates a resistance to sodium diffusion resulting in a longer lived lamp with excellent color maintenance.
    Type: Grant
    Filed: February 21, 1995
    Date of Patent: March 17, 1998
    Assignee: General Electric Company
    Inventors: Curtis E. Scott, Joseph A. Shrawder, Mohan Rajaram
  • Low sodium permeability glass
    Patent number: 5631522
    Abstract: A glass composition, particularly well suited for use in constructing sodium containing lamp envelopes. The glass composition is comprised of silica doped with yttrium and/or cesium, preferably in combination aluminum.
    Type: Grant
    Filed: May 9, 1995
    Date of Patent: May 20, 1997
    Assignee: General Electric Company
    Inventors: Curtis E. Scott, Mohan Rajaram, Joseph A. Shrawder