Patents Examined by Jack Cooper
  • Patent number: 5250366
    Abstract: The phosphor and the X-rays intensifing screen according to the present inventin emit light by the excitation of X-ray, and they are used for medical and industrial radiography. In addition to the conventional contents of rare earth tantalate and/or rare earth niobate, the phosphor according to the present invention contains a determined quantity of divalent metal. This divalent metal content can make the improvement of the afterglow characteristic and the light emission characteristic of the phosphor. The phosphor according to the present invention is represented by the general formula (I) MyLn.sub.1 -x-(2/3)yDO.sub.4 : xR.sup.3+ (I).
    Type: Grant
    Filed: May 8, 1992
    Date of Patent: October 5, 1993
    Assignee: Nichia Kagaku Kogyo K.K.
    Inventors: Shigeharu Nakajima, Genichi Shinomiya, Mizuho Takeda, Satoru Chikutei
  • Patent number: 5246609
    Abstract: A process for producing ferromagnetic fine particles for magnetic recording which comprises preparing a starting material solution containing Ba, Fe and Me (Me representing at least one element selected from the group consisting of Co, Ti, Ni, Mn, Zr, Zn, Ge, Nb and V, the amount of which is 0.2 mol or less per mol of Fe) selected such that the molar ratio of Ba/(Fe+Me) is (1+m)/12 (m being a number of 0.1 to 2), mixing this starting material solution with an alkaline solution to form a coprecipitate-containing alkaline suspension, collecting and using the coprecipitate as precursor, or subjecting the coprecipitate-containing alkaline suspension to a heat treatment at a temperature below 250.degree. C. to form a precursor, and calcining such precursor at 650.degree.-950.degree. C. to produce the hexagonal platelet Ba-ferrite particles. The process is further characterized in that a boron compound is contained in the precursor in an amount of (0.01 to 1) mmol (calculated as B.sub.2 O.sub.
    Type: Grant
    Filed: August 20, 1992
    Date of Patent: September 21, 1993
    Assignee: Ishihara Sangyo Kaisha, Ltd.
    Inventors: Kazuo Nakata, Masaharu Hirai, Nobusuke Takumi, Saburo Kato
  • Patent number: 5246610
    Abstract: A high d.sub.h piezoelectric composite material useful for utilization for hydrophones is disclosed which includes a matrix of an organic polymeric material and two different inorganic piezoelectric powders dispersed in the matrix. One of the piezoelectric powders has a large .vertline.d.sub.31 /d.sub.33 .vertline. value, such as lead titanate zirconate, and the other piezoelecctric powder has a low .vertline.d.sub.31 /d.sub.33 .vertline. value, such as lead titanate. The average particle size of one of the two piezoelectric powders is at least two times that of the other. The total amount of the two piezoelectric powders is 65-75% by volume based on the total volume of the matrix and the two piezoelectric powder. The volume ratio of the high .vertline.d.sub.31 /d.sub.33 .vertline. piezoelectric powder to the low .vertline.d.sub.31 /d.sub.33 .vertline. piezoelectric powder is in the range of 3:2 to 9:1.
    Type: Grant
    Filed: December 2, 1991
    Date of Patent: September 21, 1993
    Assignee: NGK Spark Plug Co., Ltd.
    Inventors: Hisao Banno, Kohji Ogura
  • Patent number: 5246781
    Abstract: A method of preparing a pigment-coated phosphor is provided which comprises the steps of:(a) preparing a pigment dispersion by adding pigment particles in an amount of 0.05 to 10% by weight, based on the amount of phosphor, to one of (i) a solution comprising adipic acid in the range of 0.05 to 2% by weight, based on the amount f phosphor, or (ii) a solution comprising 1,6-hexanediamine in the range of 0.05 to 2%, based on the amount of phosphor, and(b) mixing the pigment dispersion with the other of the solutions not used to form the pigment dispersion and with a phosphor dispersion comprising a phosphor dispersed in distilled water to form a pigment-coated phosphor. A pigment coated phosphor prepared according to this method is also provided.
    Type: Grant
    Filed: August 24, 1992
    Date of Patent: September 21, 1993
    Assignee: Samsung Electron Devices Co., Ltd.
    Inventor: Jwa-yeong Jeong
  • Patent number: 5242620
    Abstract: A phosphor is disclosed comprised of an effective amount of cerium to provide luminescence, and the balance substantially a gadolinium lutetium aluminate compound having the formula Gd.sub.x Lu.sub.1-x A10.sub.3, where x ranges from about 0.25 to 0.9.
    Type: Grant
    Filed: July 2, 1992
    Date of Patent: September 7, 1993
    Assignee: General Electric Company
    Inventors: Stephen L. Dole, Subramaniam Venkataramani
  • Patent number: 5236683
    Abstract: Disclosed are amorphous silica or silica-alumina spherical particles composed of X-ray diffractometrically substantially amorphous silica or silica-alumina, wherein individual particles have a definite spherical shape and a notched surface, the circularity (A) represented by the following formula: ##EQU1## wherein r1 stands for the radius of the circumcircle of the profile of the particle in an electron microscope photo thereof and r2 stands for the radius of the inscribed circle of the profile of the particle in the electron microscope photo, is in the range of from 0.90 to 1, the notching degree (B) represented by the following formula: ##EQU2## wherein .DELTA.t stands for the depth between the peak and trough in the radial direction of notches on the profile of the particle in the electron microscope photo and r1 is as defined above, is in the range of from 1 to 10%, and the primary particle size (2r1) determined by the electron microscope method is in the range of from 0.1 to 20 .mu.m.
    Type: Grant
    Filed: October 2, 1992
    Date of Patent: August 17, 1993
    Assignee: Mizusawa Industrial Chemicals, Ltd.
    Inventors: Tadahisa Nakazawa, Masahide Ogawa, Kiyoshi Abe, Kazuhiko Suzuki, Takashi Tokita, Toshio Ito
  • Patent number: 5234625
    Abstract: A method of making lead-activated barium silicate phosphor involves the use of a lead source which is not lead oxide. More particularly, the lead source may be lead silicate or lead carbonate-lead hydroxide.
    Type: Grant
    Filed: July 27, 1992
    Date of Patent: August 10, 1993
    Assignee: GTE Products Corp.
    Inventor: Cheryl M. Forster
  • Patent number: 5232626
    Abstract: In a method of preparing an alkaline earth halophospor having an antimony content greater than about 0.70 weight percent, a uniform mixture of starting raw materials is fired with already fired phosphor of the desired alkaline earth halophosphate so that the already fired phosphor is refired in an inert atmosphere containing volatile species from the uniform mixture of starting raw materials.
    Type: Grant
    Filed: June 22, 1992
    Date of Patent: August 3, 1993
    Assignee: GTE Products Corp.
    Inventor: Robert T. McSweeney
  • Patent number: 5232617
    Abstract: A process for preparing hexaferrite particles of the type M'Fe.sub.12 O.sub.19 wherein M' represents principally an alkaline earth metal involves preparing a particulate mixture of a ferrous salt of an organic acid and a salt of an organic acid with at least one metal M', optionally with at least one dopant agent, the particles of the mixture having a size not greater than about 0.5 .mu.m and the said mixture containing a stoichiometric excess of the salt of metal M'. This mixture is heated up to the decomposition of the organic salts and the resulting product is submitted to a thermal treatment at a temperature at least equal to 700.degree. C. but not greater than 1000.degree. C. and is maintained at this temperature for a period of time sufficient to form hexaferrite. After cooling the resulting particles are washed with an aqueous solution of an acid capable of dissolving formed monoferrites of the type M'Fe.sub.2 O.sub.4 to remove them.
    Type: Grant
    Filed: April 8, 1991
    Date of Patent: August 3, 1993
    Assignee: Centre National de la Recherche Scientiique
    Inventors: Christian Sarda, Abel Rousset, Paul Mollard
  • Patent number: 5231328
    Abstract: A bivalent europium-activated alkaline earth haloborate phosphor which contains lithium as coactivator, a process for its production, and an ultraviolet ray excited fluorescent tube such as a fluorescent lamp having a fluorescent layer containing such a phosphor as the blue-emitting component.
    Type: Grant
    Filed: June 15, 1992
    Date of Patent: July 27, 1993
    Assignee: Kasei Optonix, Ltd.
    Inventors: Takayuki Hisamune, Takashi Hase
  • Patent number: 5230831
    Abstract: Phosphorescent compositions of the formula NaY.sub.1-x A.sub.x M.sub.2 O.sub.6, wherein A is europium or bismuth, M is zirconium or hafnium and x is in the range of about 0.001-0.25, are prepared by the reaction of appropriate proportions of sodium bicarbonate and the corresponding metal oxides. They have a cubic fluorite-type crystal lattice.
    Type: Grant
    Filed: November 6, 1992
    Date of Patent: July 27, 1993
    Assignee: General Electric Company
    Inventor: Alok M. Srivastava
  • Patent number: 5217647
    Abstract: The present invention relates to a method for preparing a rare earth oxysulfide phosphor which comprises baking a mixture containing a rare earth oxide and/or a rare earth compound which becomes a rare earth oxide easily at a high temperature a sulfiding agent and a flux, wherein a rare earth oxysulfide seed is added to the mixture before baking.
    Type: Grant
    Filed: October 31, 1991
    Date of Patent: June 8, 1993
    Assignee: Kasei Optonix, Ltd.
    Inventors: Hideo Tono, Youji Tukihashi, Kazuhito Iwasaki
  • Patent number: 5213712
    Abstract: A phosphor comprising, an ABO.sub.3 oxide compound wherein A is about 0.002 to 22 atomic percent cerium and up to about 22 atomic percent lanthanum, and B is about 18 to 22 atomic percent of at least one of lutetium or yttrium.
    Type: Grant
    Filed: February 10, 1992
    Date of Patent: May 25, 1993
    Assignee: General Electric Company
    Inventor: Stephen L. Dole
  • Patent number: 5213703
    Abstract: This invention relates to an anisotropic neodymium-iron-boron system plastic bonded magnet containing from 10 to 20% by weight an anisotropic neodymium-iron boron system magnetic powder having a grain-size distribution from 10 to 49 microns and a resin binder. By employing this constitution, a substantially improved (BH).sub.max of the compressed mold body, due to improved magnetic field orientation, is realized.
    Type: Grant
    Filed: May 27, 1992
    Date of Patent: May 25, 1993
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shizuo Furuyama, Kiyoshi Kojima
  • Patent number: 5204021
    Abstract: A phosphor comprising an effective amount of cerium to provide luminescence, in substantially a lanthanide oxide fluoride compound having a tetragonal crystal form, the lanthanide being from the group consisting of lutetium, gadolinium, yttrium, and mixtures thereof.
    Type: Grant
    Filed: January 3, 1992
    Date of Patent: April 20, 1993
    Assignee: General Electric Company
    Inventor: Stephen L. Dole
  • Patent number: 5202777
    Abstract: A far-red emitting phosphor for cathode ray tubes used in liquid crystal light valves comprises Y.sub.3-y Gd.sub.y Al.sub.5-x Ga.sub.x O.sub.12 :A, where x ranges from 0 to 5, y ranges from 0 to 3, and A is selected from the group consisting of chromium, iron, vanadium, neodymium, dysprosium, cobalt, nickel, titanium or combination thereof.
    Type: Grant
    Filed: April 1, 1992
    Date of Patent: April 13, 1993
    Assignee: Hughes Aircraft Company
    Inventors: Esther Sluzky, Mary A. Lemoine, Kenneth R. Hesse
  • Patent number: 5202043
    Abstract: Isometric iron oxide pigments are prepared by an improved process by precipitation of aqueous solutions containing iron (II) salts with alkaline precipitating agents followed by oxidation of the precipitate at temperatures of from 20.degree. C. to 100.degree. C., wherein the improvement comprises adjusting the iron (III) content to 1 to 25 mol %, based on the total iron, before precipitation.
    Type: Grant
    Filed: November 7, 1988
    Date of Patent: April 13, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Jurgen Wiese, Gunter Buxbaum, Wilfried Burow
  • Patent number: 5198679
    Abstract: A divalent europium activated alkaline earth metal halide phosphor having the formula (I):M.sup.II X.sub.2 .multidot.aM.sup.II X'.sub.2 .multidot.bA:xEu.sup.2+(I)in which M.sup.II is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca; each of X and X' is at least one halogen selected from the group consisting of Cl, Br and I, and X.noteq.X'; A is a compound selected from the group consisting of SiO and SnX".sub.2 wherein X" is at least one halogen selected from the group consisting of F, Cl, Br and I; a and x are numbers satisfying the conditions of 0.1.ltoreq.a.ltoreq.10.0 and 0<x.ltoreq.0.2, respectively; and b is a number satisfying the conditions of 0<b.ltoreq.3.times.10.sup.-2 in the case of A being SiO and 0<b.ltoreq.10.sup.-3 in the case of A being SnX".sub.2.
    Type: Grant
    Filed: March 6, 1989
    Date of Patent: March 30, 1993
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Takayuki Katoh, Yuichi Hosoi, Kenji Takahashi
  • Patent number: 5198721
    Abstract: A flat panel display utilizes an array of eletroluminescent cells in which the active layer is of polycrystalline zinc sulfide that is the host for molecules of a ternary europium fluoride compound, advantageously lithium europium tetrafluoride. Each cell includes a pair of electrodes between which are a silicon dioxide barrier layer, sufficiently thin for electrons to tunnel therethrough, the active layer, and a capacitive dielectric layer. Other ternary europium tetrafluoride compounds are discribed for use as the active layer.
    Type: Grant
    Filed: February 24, 1991
    Date of Patent: March 30, 1993
    Assignee: NEC Research Institute, Inc.
    Inventors: Dawon Kahng, Toshihiro Yoshioka
  • Patent number: 5196234
    Abstract: A method for preparing a specific zinc orthosilicate phosphor particle having a nonparticulate, conformal aluminum oxide coating wherein all of a manganese activator is present as manganese (II) and occupies zinc (II) sites includes the steps of blending a zinc source, a manganese (II) source, a silicon source, and a tungsten source in amounts in accordance with said formula with an amount of up to about 2 weight percent NH.sub.4 Cl and up to about 0.2 weight percent NH.sub.
    Type: Grant
    Filed: July 20, 1992
    Date of Patent: March 23, 1993
    Assignee: GTE Products Corporation
    Inventors: Fred R. Taubner, A. Gary Sigai, Charles F. Chenot, Henry B. Minnier