Patents by Inventor Peter C. Drop

Peter C. Drop 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 mercury vapor discharge lamp
    Patent number: 4422011
    Abstract: High-pressure mercury vapor discharge lamp containing rare gas, mercury, sodium halide and at least one halide of at least one of the rare earth metals Ce, Pr, Nd and Lu. The lamp is suitable for a nominal power in the range from 10 to 2000 W. The molar ratio of rare earth metal to sodium, Ln:Na, has a value from 1:20 to 1:1 and the quantity of mercury, A, has a value from 2 to 100 mg/cm.sup.3. Ln:Na and A have in these ranges a low value for lamps having a high value of the power, and higher values according as the nominal power of the lamp has a lower value.
    Type: Grant
    Filed: September 30, 1981
    Date of Patent: December 20, 1983
    Assignee: U.S. Philips Corporation
    Inventors: Leonce M. J. Bruninx-Poesen, Peter C. Drop, Lambert C. I. Kaldenhoven, Roland Lorenz, Willy J. C. Endevoets
  • Method of ageing a gas discharge lamp
    Patent number: 4195253
    Abstract: A method for ageing a gas discharge lamp which is provided with a vacuum-tight sealed light-transmissive discharge vessel in which at least two electrodes are disposed and which contains a gas filling. A high-frequency glow discharge is produced in the discharge vessel during a given length of time. The frequency of this discharge preferably has a value between 1 kHz and 100 MHz and the discharge is preferably maintained for 1 to 120 seconds. Ageing results in a considerable reduction in the starting voltage of the lamp.
    Type: Grant
    Filed: February 13, 1978
    Date of Patent: March 25, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Peter C. Drop, Walter J. R. de Rop, Robert L. M. E. Maes