Patents by Inventor Susan Callahan

Susan Callahan 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).

  • Miniature reduced mercury HID lamp
    Publication number: 20050168150
    Abstract: Superior color stability in a miniature HID lamp can be achieved by reducing the size of the lamp, reducing the mercury concentration, reducing the salt concentration and increasing the heat to the lamp seal. In general the result concentrates the salts in the central, lower section of the lamp envelope and displaces them from the hot spot and electrode roots were deleterious chemical reactions can occur that are believed to subsequently reduce lamp performance.
    Type: Application
    Filed: May 6, 2004
    Publication date: August 4, 2005
    Inventors: Susan Callahan, Walter Lapatovich