Patents by Inventor Lambertus Wilhelmus Johannes Manders

Lambertus Wilhelmus Johannes Manders 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).

  • Electric gas discharge lamp having two superposed luminescent layers
    Patent number: 4069441
    Abstract: A fluorescent lamp requiring a smaller amount of luminescent material than is normally required. The luminescent layer is composed of component layers, the component layers which do not face the discharge contain a mixture of the luminescent material and a white pigment which reflects ultraviolet radiation.
    Type: Grant
    Filed: September 8, 1976
    Date of Patent: January 17, 1978
    Assignee: U.S. Philips Corporation
    Inventors: Willem Lambertus Wanmaker, deceased, Lambertus Wilhelmus Johannes Manders, Johannes Wilhelmus TER Vrugt
  • Luminescent coating for low-pressure mercury vapour discharge lamp
    Patent number: 3937998
    Abstract: A low-pressure mercury vapour discharge lamp provided with a luminescent coating comprising three luminescent materials each emitting in a narrow spectral range. The first material has an emission band with a maximum between 430 and 490 nm; the second material has its emission in the range 520-565 nm; the third material emits in the range 590-630 nm. The second material is defined by one of the formulas:A. Ce.sub.1-x-y La.sub.x Tb.sub.y MgAl.sub.11 O.sub.19b. (Ce.sub.1-x-y La.sub.x Tb.sub.y).sub.2 O.sub.3.nAl.sub.2 O.sub.3The first material is preferably chosen fromC. A.sub.1-p Eu.sub.p Mg.sub.2-q Mn.sub.q Al.sub.16 O.sub.27d. B.sub.5.5-x Eu.sub.x Mg.sub.6-y Mn.sub.y Al.sub.55 O.sub.94(a and B are barium and/or strontium).
    Type: Grant
    Filed: September 25, 1974
    Date of Patent: February 10, 1976
    Assignee: U.S. Philips Corporation
    Inventors: Judicus Marinus Pieter Jan Verstegen, Dragutin Radielovic, Lambertus Wilhelmus Johannes Manders