Patents by Inventor Kenneth F. Andrew

Kenneth F. Andrew 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).

  • High-pressure sodium vapor lamp and ternary amalgam therefor
    Patent number: 4639639
    Abstract: A high pressure sodium vapor lamp for operation at a sodium vapor pressure of at least 60 Torr and in which the start-up interval of variation of lamp operating voltage is reduced by charging the lamp with a ternary amalgam of mercury, sodium and a third metal selected from the group consisting of indium, gallium and tin. The atomic proportion of the third metal exceeds that of the mercury but does not exceed that of the sodium in the amalgam, and the atomic proportion of sodium is at least twice but not over four times that of the mercury.
    Type: Grant
    Filed: April 23, 1985
    Date of Patent: January 27, 1987
    Assignee: North American Philips Corporation
    Inventors: Chikara Hirayama, Kenneth F. Andrew