Patents by Inventor Evert D. Schutten

Evert D. Schutten 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 screen and low-pressure mercury vapor discharge lamp provided with such a screen
    Patent number: 4716335
    Abstract: A luminescent screen provided with a terbium-activated silicate having a cuspidine crystal structure according to the formula Y.sub.4-x-z-p Ca.sub.x M.sub.z.sup.II Tb.sub.p Si.sub.2-y Al.sub.y O.sub.7+x+z+y N.sub.2-x-z-y. In this formula M.sup.II is at least one of the elements Mg, Sr and Ba. The yttrium can be replaced up to at most 50 mol. % by Gd and/or La. It further holds that:0.ltoreq.x.ltoreq.1.90.ltoreq.z.ltoreq.1.0o.ltoreq.y.ltoreq.1.9x+z+y.ltoreq.1.90.05.ltoreq.p.ltoreq.1.5.
    Type: Grant
    Filed: June 2, 1986
    Date of Patent: December 29, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Evert D. Schutten, Johannus G. Verlijsdonk
  • Luminescent screen and low-pressure mercury vapor discharge lamp provided with such a screen
    Patent number: 4716336
    Abstract: A luminescent screen provided with a zirconium- and/or terbium-activated silicate having an apatite crystal structure according to the formulaLn.sub.10-x-p-q M.sub.x.sup.II Tb.sub.p Zr.sub.q (SiO.sub.4).sub.6-y (M.sup.III O.sub.4).sub.y O.sub.x+y-q N.sub.2-x-y+q.In this formula, Ln is at least one of the elements Y, La and Gd. M.sup.II is Mg, Ca and/or Sr and M.sup.III is A1 and/or B. It further holds that:______________________________________ 0 .ltoreq. x .ltoreq. 1.9 0 .ltoreq. p .ltoreq. 3 0 .ltoreq. y .ltoreq. 1.9 0 .ltoreq. q .ltoreq. x + y x + y .ltoreq. 1.9 0.1 .ltoreq. p + q.
    Type: Grant
    Filed: June 2, 1986
    Date of Patent: December 29, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Evert D. Schutten, Johannus G. Verlijsdonk
  • Fluorescent lamp
    Patent number: 4716337
    Abstract: Low-pressure mercury vapor discharge lamp having a very satisfactory color rendition and a color temperature from 2300 to 3300 K. The lamp is provided with a luminescent layer comprising:(a) a luminescent alkaline earth metal halophosphate activated by Sb.sup.3+ and Mn.sup.2+ and having a color temperature of 2900-5000 K.;(b) a luminescent material activated by Eu.sup.2+ and having an emission maximum of 470-500 nm;(c) a luminescent rate earth metal metaborate activated by Ce.sup.3+ and Mn.sup.2+ and having a red Mn.sup.2+ emission, and(d) a luminescent aluminate activated by Ce.sup.3+ and having a garnet crystal structure absorbing blue radiation below 480 nm;(e) a green luminescing Mn.sup.2+ activated material having an emission maximum in the range from 510 to 535 nm. As a result of the addition of the material e the quantity of the material d can be limited so that color point differences among the lamps are avoided.
    Type: Grant
    Filed: January 6, 1987
    Date of Patent: December 29, 1987
    Assignee: U.S. Philips Corporation
    Inventors: Cornelis Huiskes, Evert D. Schutten