Patents by Inventor Masaaki Tamatani
Masaaki Tamatani 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).
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Patent number: 6069439Abstract: A method of manufacturing a phosphor material, which comprises the steps of, generating thermal plasma, supplying a conductive material into the thermal plasma so as to evaporate the conductive material, supplying phosphor particles into the thermal plasma so as to allow the conductive material to adhere onto the surface of the phosphor particles, and cooling the phosphor particles having the conductive material adhered thereon. By making use of this method, it is possible to manufacture a phosphor material comprising a phosphor particle and a conductive layer formed on the surface of the phosphor particle, wherein the ratio between the minor axis and the major axis of the phosphor material is 1.5 or less.Type: GrantFiled: March 30, 1998Date of Patent: May 30, 2000Assignee: Kabushiki Kaisha ToshibaInventors: Naotoshi Matsuda, Masaaki Tamatani, Miwa Okumura, Keiko Albessard
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Patent number: 5893999Abstract: A specific binding material labeled with an ultrafine inorganic phosphor 1 to 100 nm in particle size is disclosed The composition of the ultrafine inorganic phosphor is one of Ln.sub.2 O.sub.3 :Re, Ln.sub.2 O.sub.2 S:Re, ZnO, CaWO.sub.4, MO.xAl.sub.2 O.sub.3 :Eu, Zn.sub.2 SiO.sub.4 :Mn, and LaPO.sub.4 :Ce,Tb, wherein Ln represents at least one element selected from La, Gd, Lu, and Y, Re represents at least one element selected from lanthanide elements, M represents at least one element selected from alkali earth metals, and x represents a value from 0.5 to 15. This ultrafine inorganic phosphor is prepared by one of the following processes a process of evaporation in a gas including an RF thermal plasma process, dc plasma thermal spraying, sputtering, glass crystallization, a sol-gel process, precipitation including hydrothermal synthesis, and a spraying process.Type: GrantFiled: September 13, 1994Date of Patent: April 13, 1999Assignee: Kabushiki Kaisha ToshibaInventors: Masaaki Tamatani, Hirotami Koike, Miwa Okumura, Keiko Albessard, Naotoshi Matsuda
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Patent number: 5851428Abstract: A raw material prepared by washing a phosphor powder containing a phosphor host material and an activator with an acid solution, followed by drying the washed powder, is heated within a thermal plasma at a temperature which permits partially melting the phosphor, followed by cooling and subsequently subjecting the resultant phosphor at 1200.degree. to 1700.degree. C., thereby manufacturing spherical phosphor particles having a concentration gradient in a radial direction.Type: GrantFiled: March 13, 1997Date of Patent: December 22, 1998Assignees: Kabushiki Kaisha Toshiba, Neturen Co., Ltd.Inventors: Naotoshi Matsuda, Masaaki Tamatani, Miwa Okumura, Keiko Albessard, Kazuhiro Kawasaki, Seiji Yokota, Shinjiro Motoki, Yoshiaki Inoue
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Patent number: 5814932Abstract: Disclosed is a phosphor suitable for use in a cathode-ray tube, a fluorescent lamp, a radiation intensifying screen, which comprises transparent spherical particles having an average particle size of 0.5 to 20 .mu.m and a ratio of the major diameter to the minor diameter of individual particles in the range of 1.0 to 1.5, and ultrafine particles having a diameter of 0.2 .mu.m less in an amount of 5 wt % or less.Type: GrantFiled: December 30, 1996Date of Patent: September 29, 1998Assignee: Kabushiki Kaisha ToshibaInventors: Naotoshi Matsuda, Masaaki Tamatani, Keiko Albessard, Miwa Okumura, Takeshi Takahara, Takeo Itou
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Patent number: 5811924Abstract: A phosphor film structure comprising a substrate and a phosphor film formed on the substrate, wherein the phosphor film comprises ultrafine phosphor particles having an average diameter of 200 nm or less, and obtained by heating a phosphor material to vaporize and rapidly quenching to solidify, and a haze of the phosphor film to a luminous flux of 380-760 nm in wavelength is 50% or less.Type: GrantFiled: September 18, 1996Date of Patent: September 22, 1998Assignee: Kabushiki Kaisha ToshibaInventors: Miwa Okumura, Naotoshi Matsuda, Keiko Albessard, Masaaki Tamatani, Fusayoshi Kido, Iwao Mitsuishi
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Patent number: 5808409Abstract: Disclosed is a phosphor suitable for use in a cathode-ray tube, a fluorescent lamp, a radiation intensifying screen, which comprises transparent spherical particles having an average particle size of 0.5 to 20 .mu.m and a ratio of the major diameter to the minor diameter of individual particles in the range of 1.0 to 1.5, and ultrafine particles having a diameter of 0.2 .mu.m or less in an amount of 5 wt % or less.Type: GrantFiled: December 30, 1996Date of Patent: September 15, 1998Assignee: Kabushiki Kaisha ToshibaInventors: Naotoshi Matsuda, Masaaki Tamatani, Keiko Albessard, Miwa Okumura, Takeshi Takahara, Takeo Itou
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Patent number: 5644193Abstract: Disclosed is a phosphor suitable for use in a cathode-ray tube, a fluorescent lamp, a radiation intensifying screen, which comprises transparent spherical particles having an average particle size of 0.5 to 20 .mu.m and a ratio of the major diameter to the minor diameter of individual particles in the range of 1.0 to 1.5, and ultrafine particles having a diameter of 0.2 .mu.m or less in an amount of 5 wt % or less.Type: GrantFiled: December 16, 1994Date of Patent: July 1, 1997Assignee: Kabushiki Kaisha ToshibaInventors: Naotoshi Matsuda, Masaaki Tamatani, Keiko Albessard, Miwa Okumura, Takeshi Takahara, Takeo Itou
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Patent number: 5640016Abstract: A scintillator is disclosed that comprises a ceramic of a rare-earth oxysulfide activated with Pr, such as Gd.sub.2 O.sub.2 S:Pr, having: (1) a ratio of a peak value at about 270 K to that at about 140 K in a glow curve of about 0.01 or less, when the thermoluminescence intensity of the scintillator is measured at a rate of temperature increase of 15.+-.5 K/min after 20 minutes irradiation with ultraviolet rays having a wavelength of 254 nm and a power of 1 W/m.sup.2 at liquid nitrogen temperature, and (2) a ratio of a peak value at about 630 nm to that at about 512 nm of a thermoluminescence of about 410 K with about 2 nm resolution of about 1 or less.Type: GrantFiled: January 31, 1996Date of Patent: June 17, 1997Assignee: Kabushiki Kaisha ToshibaInventors: Naotoshi Matsuda, Masaaki Tamatani, Miwa Okumura, Kazuto Yokota
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Luminescent material for mercury discharge lamp including phosphor and a continuous protective layer
Patent number: 5604396Abstract: A luminescent material for a mercury discharge lamp comprises a phosphor material including phosphor particles for emitting a luminous flux upon excitation by ultraviolet radiation at 254 nm and a protective layer continuously formed on the phosphor particle with at least one metal oxide selected from the group consisting of MgO, Y.sub.2 O.sub.3, La.sub.2 O.sub.3, Sm.sub.2 O.sub.3, Gd.sub.2 O.sub.3, Dy.sub.2 O.sub.3, Ho.sub.2 O.sub.3, Er.sub.2 O.sub.3, Yb.sub.2 O.sub.3, Lu.sub.2 O.sub.3, CaO, ZrO.sub.2, SrO, BaO, .alpha.-Al.sub.2 O.sub.3 and BeO. A mercury discharge lamp has a luminescent layer coated with the luminescent material on the wall of the light transmissive bulb thereof.Type: GrantFiled: July 29, 1994Date of Patent: February 18, 1997Assignees: Toshiba Lighting & Technology Corporation, Kabushiki Kaisha ToshibaInventors: Akio Watanabe, Shoji Naoki, Masaaki Tamatani, Fumiyasu Yanagisawa, Kenji Terashima -
Patent number: 5289081Abstract: A fluorescent lamp characterized in that the charging tendency of a phosphor used is positioned more negative side than that of metal oxides each having a metal ion electronegativity X.sub.i of 7.0 but more positive side than that of metal oxides each having a metal ion electronegativity X.sub.i of 11.8, that particles of the phosphor are charged positive and smaller than 3.0 .mu.C per gram when they are in contact with soda lime glass beads each having a particle size of 200-500 .mu.m, or that they are charged negative and larger than -0.5 .mu.C per gram when they are in contact with reduced iron powder having a particle size of 44-74 .mu.m.Type: GrantFiled: November 27, 1991Date of Patent: February 22, 1994Assignees: Kabushiki Kaisha Toshiba, Toshiba Lighting & Technology CorporationInventors: Masaaki Tamatani, Hidenori Ito, Akira Taya, Yoji Yuge, Kazuaki Nakagawa, Shigeru Ando, Kenji Terashima
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Patent number: 5115306Abstract: A projection cathode-ray tube for a projection video apparatus, comprising a green-emitting screen including a terbium-activated lanthanum oxychloride phosphor. The disclosed phosphor exhibits a luminance maximum at a minimum beam size, a property advantageous for producing a high-resolution image. The phosphor is chemically stable at high temperatures. The phosphor shows no substantial decrease in emission efficiency even at about 80.degree. C., and the emission luminance is twofold that of the prior art. The green-emitting screen is made by the steps of: (a) settling the terbium-activated lanthanum oxychloride phosphor onto the inner surface of a cathode-ray tube, wherein the phosphor is settled from a suspension comprising a solution of potassium water glass and barium nitrate, and wherein the ratio of the weight concentration of potassium water glass to barium nitrate is in the range between about 20 to about 35; and (b) removing the resulting supernatant.Type: GrantFiled: May 29, 1986Date of Patent: May 19, 1992Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Nobuyuki Tsuda, Masaaki Tamatani, Fukaya Ajiro, Nagai Hitosi
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Patent number: 5029320Abstract: A thin film electroluminescence device is disclosed which comprises are electrode formed on a transparatent substrate, one dielectric layer formed on the electrode, an emitting layer containing Group IIIb-Vb compound as a host material and positive trivalent element ions added as a luminescence center to the host material, the other dielectric layer formed on the emitting layer, the other electrode provided on the other dielectric layer.Type: GrantFiled: July 26, 1989Date of Patent: July 2, 1991Assignee: Kabushiki Kaisha ToshibaInventors: Fusayoshi Kido, Naotoshi Matsuda, Hideo Yoshikawa, Masaaki Tamatani
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Patent number: 4863882Abstract: Rare earth oxysulfide ceramic material prepared by covering the material with a foil of a metal selected from the group consisting of molybdenum, tungsten, platinum, and rhenium, sealing it into an airtight vessel of tantalum or niobium, and then subjecting it to a hot isostatic press process.Type: GrantFiled: March 15, 1988Date of Patent: September 5, 1989Assignee: Kabushiki Kaisha ToshibaInventors: Naotoshi Matsuda, Masaaki Tamatani, Kazuto Yokota
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Patent number: 4804882Abstract: A cathode-ray tube according to the present invention is provided with a phosphor screen comprising phosphors A, B, and C, wherein each of the phosphors A and B constitute 5 to 15% by weight and, the phosphor C constitutes 70 to 90% by weight. The phosphor A is a bluish white-emitting phosphor (Y.sub.1-x-y Gd.sub.x Tb.sub.y).sub.2 O.sub.2 S (0.ltoreq.X.ltoreq.0.999999 and 0.000001.ltoreq.Y.ltoreq.0.001), the phosphor B is at least one of a blue-emitting silver-activated hexagonal zinc sulfate (ZnS:Ag) phosphor, etc., and the phosphors C is a yellow-emitting phosphor (In.sub.1-p-r M.sub.p TB.sub.q Eu.sub.r BO.sub.3) (wherein M is at least one element selected from the group consisting of Sc, Lu, Y, Gd, and Ga, and p, q, and r satisfy 0.ltoreq.p.ltoreq.0.2, 0.0005.ltoreq.q.ltoreq.0.05, and 0.001.ltoreq.r.ltoreq.0.1). The cathode-ray tube of the present invention is a phosphor screen which is free from toxicity and has good flickering and brightness characteristics and high current dependence of brightness.Type: GrantFiled: July 2, 1987Date of Patent: February 14, 1989Assignees: Kabushiki Kaisha Toshiba, Hokuto Electronics Co., Ltd.Inventors: Takeshi Takahara, Mitsuhiro Oikawa, Yoshinori Tetsuishi, Kazuaki Higuchi, Masaaki Tamatani
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Patent number: 4774150Abstract: According to the present invention there is provided a thermal barrier coating wherein multilayers of (I) a ZrO.sub.2 layer containing a luminous activator and stabilized by Y.sub.2 O.sub.3, CaO, MgO or a mixture thereof and (II) a ZrO.sub.2 layer containing a luminous activator different from that used in (I) and stabilized by Y.sub.2 O.sub.3, CaO, MgO or a mixture thereof, or a ZrO.sub.2 layer not containing a luminous activator and stablized by Y.sub.2 O.sub.3 are stacked, and the layers at least under an uppermost layer opposite to a base member to be protected have a total thickness sufficient for exhibiting a thermal barrier effect. The present invention has as its object to provide a thermal barrier coating which allows non-destructive testing to determine whether it has a thickness sufficient for themal barrier effect.Type: GrantFiled: March 5, 1987Date of Patent: September 27, 1988Assignee: Kabushiki Kaisha ToshibaInventors: Kagetaka Amano, Hiromitsu Takeda, Takao Suzuki, Masaaki Tamatani, Masayuki Itoh, Yoshikazu Takahashi
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Patent number: 4752424Abstract: There is provided a method of manufacturing a ceramic, wherein a ceramic material is covered with a foil of a metal selected from the group consisting of molybdenum, tungsten, platinum, and rhenium, sealed into an airtight vessel of tantalum or niobium, and then subjected to a hot isostatic press process. The method of the present invention can suppress coloration produced in the hot isostatic press.Type: GrantFiled: January 20, 1987Date of Patent: June 21, 1988Assignee: Kabushiki Kaisha ToshibaInventors: Naotoshi Matsuda, Masaaki Tamatani, Kazuto Yokota
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Patent number: 4604549Abstract: Disclosed is an orange to yellow emitting phosphor, comprising an europium and terbium co-activated indium borate represented by the chemical compositional formula:(In.sub.1-a-b Eu.sub.a Tb.sub.b)BO.sub.3wherein a and b are 0.0001.ltoreq.a.ltoreq.0.04, 0.0001.ltoreq.b.ltoreq.0.04.Type: GrantFiled: August 19, 1985Date of Patent: August 5, 1986Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Naotoshi Matsuda, Masaaki Tamatani
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Patent number: 4518985Abstract: A projection type green cathode ray tube (CRT) with improved brightness despite an increase in the temperature of the faceplate, a method for manufacturing a phosphor screen adopted therein, and a projection video device which utilizes the projection type green CRT. The phosphor screen of the CRT is formed of a cerium-activated calcium sulfide phosphor which contains 0.01 to 0.3 mol% of cerium. According to the method for manufacturing the phosphor screen, the cerium-activated calcium sulfide phosphor is precipitated in a 0.3 to 5% aqueous solution of water glass based on weight. The aqueous solution does not contain barium ions. The projection video device includes the green CRT, a red CRT having a phosphor screen which is formed of an europium-activated yttrium oxide phosphor, and a blue CRT having a phosphor screen which is formed of a silver-activated zinc sulfide phosphor. Brightness of images is improved and does not substantially change over time.Type: GrantFiled: June 4, 1982Date of Patent: May 21, 1985Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Masaaki Tamatani, Nobuyuki Tsuda, Norio Koike, Sakae Ajiro
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Patent number: 4436646Abstract: A green-emitting phosphor for a cathode-ray tube contains calcium sulfide activated by cerium and lithium. Decreases in the brightness when the tube is excited with an electron beam of high current densities or is subjected to high temperatures are eliminated.Type: GrantFiled: September 22, 1982Date of Patent: March 13, 1984Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Takeshi Takahara, Takeo Sato, Takeo Itou, Masaaki Tamatani