Patents by Inventor Emiel Petrus Juliaan DE Meester

Emiel Petrus Juliaan DE Meester 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).

  • Beryllium-containing europium activated phosphate phosphor, luminescent screen and discharge lamp containing same
    Patent number: 4049992
    Abstract: A luminescent beryllium-containing phosphate activated by bivalent europium defined by the formula Me.sub.a-x Be.sub.b Eu.sub.x P.sub.2 O.sub.8 where a + b = 3 and 0.01.ltoreq.x.ltoreq.0.25 and b has the value 1 or 2. If b = 2, Me mainly represents one of the alkaline earth metals barium, strontium and calcium. If b = 1, Me mainly represents barium and/or strontium.The luminescent phosphate may be used in mercury vapor discharge lamps and in low-pressure cadmium vapor discharge lamps.
    Type: Grant
    Filed: May 22, 1974
    Date of Patent: September 20, 1977
    Assignee: U.S. Philips Corporation
    Inventors: Judicus Marinus Pieter Jan Verstegen, Willebrordus Hubertus Martinus Maria VAN DE Spijker, Emiel Petrus Juliaan DE Meester