Patents by Inventor Joseph Rutten

Joseph Rutten 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).

  • Luminescent Eu.sup.3+ -activated silicate, luminescent screen provided with such a silicate and low-pressure mercury vapor discharge lamp provided with such a screen
    Patent number: 4810930
    Abstract: Luminescent Eu.sup.3+ -activated alkaline earth metal-rare earth metal silicate, which is defined by the formulaBa.sub.2 Gd.sub.2-x-y Y.sub.x Eu.sub.y Si.sub.4-z Ge.sub.z O.sub.13,in which O.ltoreq.x.ltoreq.1.3, 0.01.ltoreq.y.ltoreq.1.0 and O.ltoreq.z.ltoreq.4, luminescent screen provided with such a silicate and low-pressure mercury vapor discharge lamp provided with such a screen.
    Type: Grant
    Filed: July 29, 1988
    Date of Patent: March 7, 1989
    Assignee: U.S. Philips Corporation
    Inventors: Johannus G. Verlijsdonk, Bruno M. J. Smets, Joseph Rutten
  • Luminescent screen and lamp containing the same
    Patent number: 4524300
    Abstract: A luminescent screen provided with a luminescent layer formed on a carrier, which layer comprises an aluminate and/or a gallate of strontium and/or barium activated by bivalent europium or by trivalent chromium. The aluminate and/or gallate has an orthorhombic crystal structure with a space group P.sub.nnm and has a composition defined by the formula Me.sub.2-x Eu.sub.x A.sub.6-y Cr.sub.y O.sub.11 (Me=Sr, Ba and A-Al, Ga).An advantageous application of such a luminescent screen is found in low-pressure mercury vapor discharge lamps.
    Type: Grant
    Filed: May 7, 1984
    Date of Patent: June 18, 1985
    Assignee: U.S. Philips Corporation
    Inventors: Joseph Rutten, Gerardus P. F. Hoeks, Johannes T. C. van Kemenade