Patents Examined by Jack Cooper
  • Patent number: 5068055
    Abstract: A europium activated strontium tetraborate UV emitting phosphor is disclosed having a weight composition of from about 34.72% to about 35.80 strontium %, from about 17.66% to about 17.78 boron %, from about 0.37% to about 1.86% europium, and the balance oxygen. The phosphor has essentially elongated prism-like particles with the europium relatively uniformly distributed throughout the balance of the phosphor and with the particle size distribution being characterized by the 50% size being in the range of from about 7 micrometers to about 12 micrometers as determined by Coulter Counter measurement and with less than about 12% by weight of the particles having a particle size of greater than about 16 micrometers as determined by Coulter Counter measurement. The process for making the phosphor is disclosed which involves forming a mixture of strontium carbonate and europium carbonate in an aqueous solution of boric acid at a temperature of at least about 70.degree. C. with the mole ratio of SrCO.sub.3 to H.sub.
    Type: Grant
    Filed: February 25, 1991
    Date of Patent: November 26, 1991
    Assignee: GTE Products Corporation
    Inventors: Charles F. Chenot, Michael A. Krebs
  • Patent number: 5068050
    Abstract: An amorphous oxide magnetic material is represented by a formula (1-y) [Ln.sub.1-x A.sub.x MnO.sub.3-.delta. ].multidot.y[XO] wherein x and y fall within the ranges of 0.1.ltoreq.x.ltoreq.1.0 and y.ltoreq.0.7, respectively. Ln represents at least one element selected from the group consisting of Ln and a rare earth element. A represents at least one element selected from the group consisting of Ca, Sr, Ba and Pb, X represents at least one element selected from the group consisting of B, Bi, Si, Mg, Mo, V, Zn, P and Ge, and .delta. represents oxygen deficiency and .delta..ltoreq.1.
    Type: Grant
    Filed: November 15, 1988
    Date of Patent: November 26, 1991
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Koichiro Inomata, Susumu Hashimoto
  • Patent number: 5062983
    Abstract: A magnetic powder for magnetic recording media, which has an average particle diameter of at most 0.08 .mu.m and a ratio of the maximum diameter to the maximum thickness of at most 8 and is represented by the following general composition formula:(Fe).sub.a (Sn).sub.b (Si).sub.c (M.sup.1).sub.d (M.sup.2).sub.e (M.sup.3).sub.f (O).sub.gwherein M.sup.1 means at least one metal element selected from Ba, Sr, Ca and Pb, M.sup.2 denotes at least one metal element selected from Cr, Y, Ce, Nd, Sm, Al, La and Cd, M.sup.3 stands for at least one metal element selected from Mg, Ti, Mn, Ni, Cu, Zn, Sb, In, Mo and W, a, b, c, d, e, f and g respectively represent the numbers of Fe, Sn, Si, M.sup.1, M.sup.2, M.sup.3 and O atoms, a is a number of 8.0 to 12.0, b is a number of 0.01 to 6.0, c is a number of 0.05 to 6.0, d is a number of 0.3 to 6.0, e is a number of 0.01 to 6.0, and f is a number of 0.0 to 6.0, and g is the number of oxygen atoms satisfying the atomic valences of the other elements.
    Type: Grant
    Filed: April 30, 1990
    Date of Patent: November 5, 1991
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Haruhisa Yamamoto, Hidenobu Urata, Tatsuo Kinebuchi, Hidenori Sawabe
  • Patent number: 5062982
    Abstract: A magnetic powder for magnetic recording media, which has an average particle diameter of at most 0.1 .mu.m and is represented by the following general composition formula:(Fe).sub.a (Zr).sub.b (Si).sub.c (M.sup.1).sub.d (M.sup.2).sub.e (M.sup.3).sub.f (O).sub.gwherein M.sup.1 means at least one metal element selected from Ba, Sr, Ca and Pb, M.sup.2 denotes at least one metal element selected from Mo and W, M.sup.3 stands for at least one metal element selected from Mg, Ti, Mn, Ni, Cu, Zn, Sb, La, Al, In, Ce, Nd and Sm, a, b, c, d, e, f and g respectively represent the numbers of Fe, Zr, Si, M.sup.1, M.sup.2, M.sup.3 and O atoms, a is a number of 8.0 to 12.0, b is a number of 0.01 to 6.0, c is a number of 0.05 to 6.0, d is a number of 0.3 to 6.0, e is a number of 0.01 to 6.0, and f is a number of 0.0 to 6.0, and g is the number of oxygen atoms satisfying the atomic valences of the other elements.
    Type: Grant
    Filed: April 5, 1990
    Date of Patent: November 5, 1991
    Assignee: Nippon Zeon Co., Ltd.
    Inventors: Haruhisa Yamamoto, Hidenobu Urata, Tatsuo Kinebuchi, Hidenori Sawabe
  • Patent number: 5057738
    Abstract: A novel MgMnZn-ferrite material is described which is particularly suitable for deflection rings which are mounted in the deflection coil of a cathode-ray tube. The material corresponds to the formula (Li.sub.0.5 Fe.sub.0.5).sub.p Mg.sub.q Zn.sub.x Mn.sub.y Fe.sub.z O.sub.3/2(y+z)+1, wherein0.03.ltoreq.p.ltoreq.0.250.30.ltoreq.q.ltoreq.0.600.35.ltoreq.x.ltoreq.0.500.03.ltoreq.y.ltoreq.0.181.70.ltoreq.z.ltoreq.1.90y+z.ltoreq.2.0 and,p+q+x=1.00The said material exhibits extremely low power losses and a relatively high initial permeability.
    Type: Grant
    Filed: May 24, 1990
    Date of Patent: October 15, 1991
    Assignee: U.S. Philips Corporation
    Inventor: Jacobus G. Boerekamp
  • Patent number: 5055227
    Abstract: A fluorescent composition for low velocity electron beam excitation, comprising a phosphor capable of emitting light under excitation by a high velocity electron beam and indium oxide (In.sub.2 O.sub.3) mixed or mutually adhered to each other, wherein the half value width of the strongest diffraction line in the diffraction X-ray spectrum of the indium oxide (In.sub.2 O.sub.3) is within a range of from 0.10.degree. to 0.25.degree..
    Type: Grant
    Filed: May 15, 1990
    Date of Patent: October 8, 1991
    Assignee: Kasei Optonix, Ltd.
    Inventors: Kunihiko Yoneshima, Fumio Takahashi
  • Patent number: 5055226
    Abstract: A manufacturing method for a Y.sub.2 O.sub.3 : Eu red phosphor is disclosed in which yttrium oxide and europium oxide are used, and also a composite flux composed of a mixture of Na.sub.2 CO.sub.3, NaF and B.sub.2 O.sub.3 is used. The Y.sub.2 O.sub.3 : Eu red phosphor according to the present invention is uniform in its particle size distribution, has a desirable spherical particle shape, shows a perfect filling state of the layer, and shows a luminance improvement by 4-7% over that of the conventional phosphor.
    Type: Grant
    Filed: December 15, 1989
    Date of Patent: October 8, 1991
    Assignee: Samsung Electron Devices Co., Ltd.
    Inventor: Junmo Yang
  • Patent number: 5051203
    Abstract: A phosphor producing process capable of providing a phosphor of good quality in a reduced period of time. A Li compound acting as a doping agent is added prior to primary calcination so that it may also act as a flux and removed by washing prior to secondary calcination. A ZnO.Ga.sub.2 O.sub.3 solid solution thus obtained is activated in the secondary calcination using an atmosphere in which reducing gas and Zn gas are mixed. Thus, a ZnO.Ga.sub.2 O.sub.3 :Li, P phosphor is which the molar ratio between Zn and Ga.sub.2 O.sub.3 is 1:1 and of which crystals exhibit good surface conditions can be produced in a reduced period of time.
    Type: Grant
    Filed: November 23, 1990
    Date of Patent: September 24, 1991
    Assignee: Futaba Denshi Kogya K.K.
    Inventors: Hitoshi Toki, Yoshitaka Satoh
  • Patent number: 5051201
    Abstract: Finely divided hexagonal ferrite powder is prepared by autoclave treatment of an aqueous alkaline suspension containing the ferrite-forming metal ions at from 250.degree. to 330.degree. C. and subsequent heating of the resulting material at not more than 900.degree. C., by a process in which the ferrite-forming metal ions are used in the form of salts melted in their water of crystallization.
    Type: Grant
    Filed: September 11, 1990
    Date of Patent: September 24, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Michael W. Mueller, Ekkehard Schwab, Volker Arndt
  • Patent number: 5047161
    Abstract: Isometric cobalt- and titanium-containing magnetic iron oxides are prepared by reacting acicular iron(III) oxide hydroxides with compounds of divalent cobalt and iron and compounds of tetravalent titanium in aqueous alkaline suspension at elevated temperature.
    Type: Grant
    Filed: April 18, 1988
    Date of Patent: September 10, 1991
    Inventors: Werner Steck, Hartmut Hibst, Helmut Jakusch
  • Patent number: 5047173
    Abstract: The powder weight of high powder weight SrB.sub.4 O.sub.7 :Eu phosphor is reduced by milling the phosphor, blending it with EuF.sub.3 and H.sub.3 BO.sub.3, firing the blend and then milling the blend in water containing Sr(OH).sub.2.8H.sub.2 O.
    Type: Grant
    Filed: March 8, 1991
    Date of Patent: September 10, 1991
    Assignee: GTE Products Corporation
    Inventors: Anthony F. Kasenga, Joseph J. Lenox, James J. Colson, Jr.
  • Patent number: 5043097
    Abstract: A photoluminescent material used for detection of infrared light is prepared using a base material, first and second dopants, a carbonate of the base material, and a fusible salt. The base material is an alkaline earth metal sulfide such as calcium sulfide. Calcium carbonate is used to decrease phosphorescence after charging, whereas lithium fluoride is used to allow the material to be fused together. Samarium oxide and europium oxide are used as the first and second dopants for establishing a communication band and an electron trapping level, respectively. The photoluminescent material is made according to a process involving drying the material, heating the material in a graphite crucible to a fusing temperature in a dry inert atmosphere, grinding the material after cooling, and reheating the material to below the fusing temperature, but sufficiently high to repair the crystal surfaces. The material is then placed in a transparent binder and applied to a substrate.
    Type: Grant
    Filed: June 8, 1989
    Date of Patent: August 27, 1991
    Assignee: Quantex Corporation
    Inventor: Joseph Lindmayer
  • Patent number: 5043096
    Abstract: Materials having thermoluminescent properties using a base material and three dopants and made from a process of mixing the parts together, heating the mixture to fuse together, grinding the mass into a fine powder, and reheating the powder. The resultant powder may be combined with a vehicle to form a paint. A fusible salt may be used in making the thermoluminescent material. The dopants are preferably La.sub.2 O.sub.3, Eu.sub.2 O.sub.3 and CeO.sub.2.
    Type: Grant
    Filed: February 7, 1991
    Date of Patent: August 27, 1991
    Assignee: Quantex Corp.
    Inventor: Joseph Lindmayer
  • Patent number: 5039449
    Abstract: A new and improved method of treating a manganese activated zinc silicate phosphor is described. The method comprises heating a manganese activated zinc silicate phosphor powder having cations consisting essentially of zinc, silicon, manganese, and tungsten and having a 350 nm reflectance less than 80% and a 275 nm reflectance greater than 13.5% to a temperature of about 1225.degree. C. in air. The phosphor powder is then cooled to room temperature and wet milled in an acid solution. The phosphor powder is then separated from the acid solution washed in water and dried to form a dry phosphor powder having a 350 nm reflectance equal to or greater than 80% and a 275 nm reflectance equal to or less than 13.5%.
    Type: Grant
    Filed: November 7, 1988
    Date of Patent: August 13, 1991
    Assignee: GTE Laboratories Incorporated
    Inventors: Thomas E. Peters, Roger B. Hunt, A. Gary Sigai
  • Patent number: 5039448
    Abstract: An X-ray imaging system includes a phosphor that exhibits a fast-acting photoluminescent response both in luminescing upon X-ray stimulation and ceasing to luminesce upon cessation of X-ray stimulation. The phosphor has the general formula A.sub.2 MX.sub.6 wherein A is selected from Cs, Rb, Na and K; M is selected from Ti, Zr, Hf and Te; and X is selected from Cl and Br. In one form the phosphor has a purity with respect to naturally-occuring impurities of at least about 98.0 percent (by weight) and is sufficiently deficient of luminescent activators effective only at very low temperatures that the phosphor luminesces at higher temperatures.
    Type: Grant
    Filed: June 6, 1989
    Date of Patent: August 13, 1991
    Assignee: General Electric Company
    Inventor: John F. Ackerman
  • Patent number: 5037577
    Abstract: A method of producing fine, single-phase YAG particles and fine, single-phase YAG phosphor particles. The method includes subjecting yttrium and aluminum solubilized in an aqueous alkaline solution to a heating reaction at not lower than a predetermined temperature to produce the fine single-phase YAG particles having a uniform particle size distribution. The method also includes adding terbium solubilized in an aqueous alkaline solution as an activating element to the solution of yttrium and aluminum and subjecting this solution to a heating section to produce fine single-phase YAG phosphor particles having a uniform particle size distribution.
    Type: Grant
    Filed: July 24, 1989
    Date of Patent: August 6, 1991
    Assignee: Sony Corporation
    Inventors: Hiroshi Yamanoi, Satoru Uedaira
  • Patent number: 5030371
    Abstract: An acicular, ferromagnetic material which has a high coercive force and essentially consists of iron-containing chromium dioxide is prepared by thermal decomposition of hydrated chromium(III) chromate under superatmospheric pressure.
    Type: Grant
    Filed: October 31, 1989
    Date of Patent: July 9, 1991
    Assignee: BASF
    Inventors: Michael W. Mueller, Ekkehard Schwab, Helmut Auweter, Rainer Feser, Rudi Lehnert, Norbert Mueller, Manfred Ohlinger
  • Patent number: 5028348
    Abstract: A magnetic material for mircowave and millimeter wave frequencies consists essentially of a basic composition and at least one additive incorporated therein, the basic composition being represented by the general formula:Li.sub.x Fe.sub.y Ti.sub.z O.sub.0.5+y+1.5zwhere x, y and z are mole fractions of three components and each takes a value within the following respective ranges, 0.15.ltoreq.x.ltoreq.0.30, 0.55.ltoreq.y.ltoreq.0.85, 0.ltoreq.z.ltoreq.0.30, and x+y+z=1.00, and the additive being at least one oxide selected from the group consisting of lead oxide, vanadium oxide, boron oxide and silicon oxide. The content of the additive ranges from not less than 0.01 mol % to not more than 1.0 mol % in terms of PbO, V.sub.2 O.sub.5, B.sub.2 O.sub.3 and SiO.sub.2, respectively.
    Type: Grant
    Filed: December 19, 1989
    Date of Patent: July 2, 1991
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Takehiro Konoike, Kunishaburo Tomono
  • Patent number: 5023014
    Abstract: A rare earth element activated complex halide phosphor and a radiation image storage panel having a fluorescent layer comprising the phosphor, which phosphor is represented by the formula:BaFX.multidot.aLiX'.multidot.bBeX.sub.2 ".multidot.cM.sup.III X.sub.3 '":dAwherein M.sup.III is at least one trivalent metal selected from the group consisting of Al and Ga, each of X, X', X" and X'" is at least one halogen selected from the group consisting of Cl, Br and I, A is at least one rare earth element selected from the group consisting of Eu, Tb, Ce, Tm, Dy, Pr, Ho, Nd, Yb, Er, Gd, Lu, Sm and Y, a, b and c are numbers satisfying the conditions of 0.ltoreq.a.ltoreq.0.ltoreq.b.ltoreq.0.1, 0.ltoreq.c.ltoreq.0.1 and 10.sup.-4 .ltoreq.a+b+c.ltoreq.0.1, and d is a number satisfying the condition of 10.sup.-6 .ltoreq.d.ltoreq.0.2.
    Type: Grant
    Filed: September 5, 1989
    Date of Patent: June 11, 1991
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hiroyuki Toda, Junji Miyahara, Kenji Takahashi
  • Patent number: 5023015
    Abstract: An improved method for preparing a phosphor is disclosed. The method of the invention includes preparing a solution comprising the non-oxygen elements of the phosphor in molar proportions equal to the respective molar proportions of the non-oxygen elements in the phosphor; precipitating the non-oxygen elements from the solution through the addition of a precipitating agent; spray drying the solution including the precipitate to form a spray dried powder; and firing the spray dried powder in a single firing step. The single firing step of the method comprises (a) increasing the temperature of the spray dried powder at an even and controlled rate from room temperature to a firing temperature sufficiently high to convert the spray dried powder to the phosphor; and (b) maintaining the temperature of the spray dried powder at the firing temperature for a period of time sufficient to produce the phosphor. The method is particularly useful in the preparation of Eu.sup.2+ -activted strontium borate phosphor.
    Type: Grant
    Filed: December 19, 1989
    Date of Patent: June 11, 1991
    Assignee: GTE Products Corporation
    Inventor: Costas C. Lagos