Patents Assigned to North American Philips Electric Corporation
  • Method of manufacturing metal halide lamp
    Patent number: 4643690
    Abstract: A metal halide lamp provides exceptional color rendition because of a high calcium iodide partial pressure. A long-arc ellipsoidal arc tube provides a high "cold spot" temperature.The method of manufacture of the lamp includes heating the arc tube tubulation while burning the lamp after dosing, and then an evacuation step to eliminate moisture due to the hygroscopic calcium iodide.
    Type: Grant
    Filed: September 3, 1985
    Date of Patent: February 17, 1987
    Assignee: North American Philips Electric Corporation
    Inventors: Nancy J. Caruso, Michael H. Masto