Patents by Inventor Willebrordus H. M. M. VAN DE Spijker

Willebrordus H. M. M. VAN DE Spijker 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).

  • Cerium and terbium activated luminescent material and mercury vapor discharge lamp containing the same
    Patent number: 4837481
    Abstract: A luminescent screen provided with a luminescent material having the hexagonal crystal structure, which material is an aluminate, a gallate or an aluminate gallate. The crystal structure of the luminescent material corresponds to that of at least one of the compounds .beta.-aluminium, .beta."-alumina and the hexagonal ferrites. The luminescent material is activated by at least one of the elements manganese, europium, lead, thallium, cerium, indium, terbium, dysprosium and bismuth and is a ternary compound whose composition can be represented in the ternary phase diagram ABC in which A represents at least one of the oxides 1/4Na.sub.2 O, 1/2K.sub.2 O, 1/2Rb.sub.2 O, 1/2Cs.sub.2 O, CaO, SrO, BaO, 1/2La.sub.2 O.sub.3, 1/2Ce.sub.2 O.sub.3, 1/2Tb.sub.2 O.sub.3, 1/2Dy.sub.2 O.sub.3, 1/2Bi.sub.2 O.sub.3, EuO, PbO, 1/2Tl.sub.2 O and 1/2In.sub.2 O, in which B represents at least one of the oxides Al.sub.2 O.sub.3 and Ga.sub.2 O.sub.3 in which up to 25 mol. % of the oxides denoted by B may be replaced by Sc.sub.2 O.
    Type: Grant
    Filed: June 4, 1985
    Date of Patent: June 6, 1989
    Assignee: U.S. Philips Corporation
    Inventors: Judicus M. P. J. Verstegen, Johannus G. Verlijsdonk, Emiel P. J. de Meester, Willebrordus H. M. M. Van de Spijker, Johannes G. Verriet
  • Luminescent material and discharge lamp containing the same
    Patent number: 4441049
    Abstract: A luminescent screen provided with a luminescent material having the hexagonal crystal structure, which material is an aluminate, a gallate or an aluminate gallate. The crystal structure of the luminescent material corresponds to that of at least one of the compounds .beta.-aluminium, .beta."-alumina and the hexagonal ferrites. The luminescent material is activated by at least one of the elements manganese, europium, lead, thallium, cerium, indium, terbium, dysprosium and bismuth and is a ternary compound whose composition can be represented in the ternary phase diagram ABC in which A represents at least one of the oxides 1/4Na.sub.2 O, 1/2K.sub.2 O, 1/2Rb.sub.2 O, 1/2Cs.sub.2 O, CaO, SrO, BaO, 1/2La.sub.2 O.sub.3, 1/2Ce.sub.2 O.sub.3, 1/2Tb.sub.2 O.sub.3, 1/2Dy.sub.2 O.sub.3, 1/2Bi.sub.2 O.sub.3, EuO, PbO, 1/2Tl.sub.2 O and 1/2In.sub.2 O, in which B represents at least one the oxides Al.sub.2 O.sub.3 and Ga.sub.2 O.sub.3 in which up to 25 mol. % of the oxides denoted by B may be replaced by Sc.sub.2 O.sub.
    Type: Grant
    Filed: December 16, 1982
    Date of Patent: April 3, 1984
    Assignee: U.S. Philips Corporation
    Inventors: Judicus M. P. J. Verstegen, Johannus G. Verlijsdonk, Emiel P. J. De Meester, Willebrordus H. M. M. Van de Spijker, Johannes G. Verriet
  • Luminescent material and discharge lamp containing the same
    Patent number: 4382207
    Abstract: A luminescent screen provided with a luminescent material having the hexagonal crystal structure, which material is an aluminate, a gallate or an aluminate gallate. The crystal structure of the luminescent material corresponds to that of at least one of the compounds .beta.-aluminium, .beta."-alumina and the hexagonal ferrites. The luminescent material is activated by at least one of the elements manganese, europium, lead, thallium, cerium, indium, terbium, dysprosium and bismuth and is a ternary compound whose composition can be represented in the ternary phase diagram ABC in which A represents at least one of the oxides 1/4Na.sub.2 O, 1/2K.sub.2 O, 1/2Rb.sub.2 O, 1/2Cs.sub.2 O, CaO, SrO, BaO, 1/2La.sub.2 O.sub.3, 1/2Ce.sub.2 O.sub.3, 1/2Tb.sub.2 O.sub.3, 1/2Dy.sub.2 O.sub.3, 1/2Bi.sub.2 O.sub.3, EuO, PbO, 1/2Tl.sub.2 O and 1/2In.sub.2 O, in which B represents at least one of the oxides Al.sub.2 O.sub.3 and Ga.sub.2 O.sub.3 in which up to 25 mol. % of the oxides denoted by B may be replaced by Sc.sub.2 O.
    Type: Grant
    Filed: April 28, 1980
    Date of Patent: May 3, 1983
    Assignee: U.S. Philips Corporation
    Inventors: Judicus M. P. Jan Verstegen, Johannus G. Verlijsdonk, Emiel P. J. de Meester, Willebrordus H. M. M. Van de Spijker, Johannes G. Verriet
  • Luminescent lead-activated alkaline earth metal rare earth metal borates and mercury vapor discharge lamp containing the same
    Patent number: 4233538
    Abstract: Luminescent lead-activated alkaline earth metal rare earth metal borates having compositions defined by the formula Me.sub.1-p Pb.sub.p La.sub.1-x-y Y.sub.x Gd.sub.y BO.sub.4, where Me represents strontium and/or calcium, where 0.005 .ltoreq.p.ltoreq.0.30 and 0.ltoreq.x.ltoreq.0.1, and where O.ltoreq.y.ltoreq.0.5 when at least 75 mole% of Me is Ca and O.ltoreq.y.ltoreq.0.1 when less than 75 mole% of Me is Ca. The borate may be used in the luminescent screen of low-pressure mercury vapor discharge lamps.
    Type: Grant
    Filed: April 18, 1979
    Date of Patent: November 11, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Willebrordus H. M. M. van de Spijker, Willem L. Konijnendijk
  • Luminescent material and discharge lamp and cathode ray tube containing the same
    Patent number: 4216408
    Abstract: A luminescent screen provided with a luminescent material having the hexagonal crystal structure, which material is an aluminate, a gallate or an aluminate gallate. The crystal structure of the luminescent material corresponds to that of at least one of the compounds .beta.-aluminium, .beta."-alumina and the hexagonal ferrites. The luminescent material is activated by at least one of the elements manganese, europium, lead, thallium, cerium, indium, terbium, dysprosium and bismuth and is a ternary compound whose composition can be represented in the ternary phase diagram ABC in which A represents at least one of the oxides 1/4Na.sub.2 O, 1/2K.sub.2 O, 1/2Rb.sub.2 O, 1/2Cs.sub.2 O, CaO, SrO, BaO, 1/2La.sub.2 O.sub.3, 1/2Ce.sub.2 O.sub.3, 1/2Tb.sub.2 O.sub.3, 1/2Dy.sub.2 O.sub.3, 1/2Bi.sub.2 O.sub.3, EuO, PbO, 1/2Tl.sub.2 O and 1/2In.sub.2 O, in which B represents at least one of the oxides Al.sub.2 O.sub.3 and Ga.sub.2 O.sub.3 in which up to 25 mol. % of the oxides denoted by B may be replaced by Sc.sub.2 O.
    Type: Grant
    Filed: February 10, 1978
    Date of Patent: August 5, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Judicus M. P. J. Verstegen, Johannus G. Verlijsdonk, Emiel P. J. de Meester, Willebrordus H. M. M. van de Spijker, Johannes G. Verriet
  • Luminescent material
    Patent number: 4127498
    Abstract: A luminescent beryllium-containing silicate activated by bivalent europium defined by the formula Me.sub.1-x Eu.sub.x Be.sub.a Si.sub.a O.sub.3a+1, in which 0.005 .ltoreq.x.ltoreq.0.20 and a has the value 1 or 2 and in which Me represents at least one of the alkaline earth metals barium, strontium and calcium. If a = 2 at least 50 gram-atomic % of Me is strontium. If a = 1 up to 25 gram.atomic % of Be together with the same quantity of Si may be replaced by an equiatomic quantity of Al.The luminescent silicate is preferably used in mercury vapor discharge lamps.
    Type: Grant
    Filed: May 22, 1974
    Date of Patent: November 28, 1978
    Assignee: U.S. Philips Corporation
    Inventors: Judicus M. P. J. Verstegen, Willebrordus H. M. M. VAN DE Spijker, Johannus G. Verlijsdonk