Patents by Inventor Masaji Ishii
Masaji Ishii 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: 4610858Abstract: A chlorosilane disproportionation catalyst comprising a tertiary amine of the formula: ##STR1## where each R represents an aliphatic hydrocarbon group and the sum of carbon atoms in the three aliphatic hydrocarbon groups as R is 12 or more, and a tertiary amine hydrochloride of the formula: ##STR2## where R is as defined above.Type: GrantFiled: March 20, 1985Date of Patent: September 9, 1986Assignee: Denki Kagaku Kogyo Kabushiki KaishaInventors: Mitsunori Yamada, Masaji Ishii, Akira Miyai, Yukihiko Nakajima, Shinsei Sato
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Patent number: 4591754Abstract: An electron gun for high brightness including a LaB.sub.6 single crystal cathode having a (100) plane on at least part of a main electron beam emission surface of a cathode tip having a top and a Wehnelt having a tapered surface defining an interior angle similar to or greater than a vertical angle of said cathode tip.Type: GrantFiled: April 22, 1985Date of Patent: May 27, 1986Assignee: Denki Kagaku Kogyo Kabushiki KaishaInventors: Hirotoshi Hagiwara, Hideo Hiraoka, Masaji Ishii
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Patent number: 4482838Abstract: A thermionic emission cathode of a single crystal made of the calcium hexaboride type crystaline structure comprises a top surrounded by natural face inherent to the axial direction of the single crystal.Type: GrantFiled: December 4, 1981Date of Patent: November 13, 1984Assignee: Denki Kagaku Kogyo Kabushiki KaishaInventors: Masaji Ishii, Hirotoshi Hagiwara, Hideo Hiraoka
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Patent number: 4482839Abstract: A thermionic emission cathode comprises a cathode tip made of an alkaline earth metal or rare earth metal hexaboride, a metallic support for supporting a base of said cathode tip and a reaction barrier layer comprising colloidal carbon and a reaction barrier material which bonds said cathode tip and said metallic support in one body.Type: GrantFiled: January 20, 1982Date of Patent: November 13, 1984Assignee: Denki Kagaku Kogyo Kabushiki KaishaInventors: Tetsuya Wada, Masaji Ishii, Akira Miyai, Hirotoshi Hagiwara
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Patent number: 4288717Abstract: A thermionic cathode includes an electron emitting tip, lanthanum hexaboride tip supporting heaters in close contact with both sides of the tip and supporting the tip, and elastic electroconductive members in pressure contact with outer surfaces of the tip supporting heaters for supplying electric current. The tip supporting heaters are obtained by cutting lanthanum hexaboride having high anisotropy due to its layered structure so as to form a pair of parallel planes perpendicular to a pressing direction when hot-pressed, and abrade-polishing the parallel planes. The tip supporting heaters are brought into close contact with the tip and the elastic electroconductive members at the resulting smooth surfaces thereof. The apparatus of the invention has a prolonged lifetime and high efficiency.Type: GrantFiled: November 6, 1979Date of Patent: September 8, 1981Assignee: Denki Kagaku Kogyo Kabushiki KaishaInventors: Hiroaki Tanji, Mitsuaki Saito, Masaji Ishii
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Patent number: 4168565Abstract: A method for manufacturing a thermionic cathode is provided which comprises cutting a bar from a multi-layer structure having a first layer of thermoelectron emissive compound and a third layer of metal of high melting point, a second layer of reaction barrier being interposed between said first and third layers, the bar being cut in a direction substantially perpendicular to that of the layers, sharpening the end of the first layer of the bar and then providing current terminals with the third layer of the bar. According to the method of the invention, a thermionic cathode capable of emitting stable electron beams of high intensity for a long period of time can be manufactured.Type: GrantFiled: April 20, 1978Date of Patent: September 25, 1979Assignee: Denki Kagaku Kogyo Kabushiki KaishaInventors: Masaji Ishii, Shuzo Watanabe, Akira Miyai, Hideo Hiraoka
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Patent number: 4137476Abstract: A thermionic cathode for an electron beam device is provided which comprises a first layer of thermoelectron emissive compound sharpened towards a point, a third layer of metal of high melting point and a second layer of reaction barrier interposed between the first and third layers, current terminals being attached to said third layer. According to the invention, a thermionic cathode capable of emitting stable electron beams of high intensity for a long period of time can be manufactured.Type: GrantFiled: May 18, 1977Date of Patent: January 30, 1979Assignee: Denki Kagaku Kogyo Kabushiki KaishaInventors: Masaji Ishii, Shuzo Watanabe, Akira Miyai, Hideo Hiraoka
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Patent number: 4112290Abstract: An evaporation vessel for vacuum evaporation of electroconductive ceramic boat for use in the vacuum evaporation of a metallic or non-metallic substance by virtue of resistance heating, wherein the surface of the adjoining portion on the both sides of a cavity is lower than the top of the outside wall of the cavity.Type: GrantFiled: October 27, 1976Date of Patent: September 5, 1978Assignee: Denki Kagaku Kogyo Kabushiki KaishaInventors: Yukihiko Nakajima, Shuzou Watanabe, Akira Miyai, Masaji Ishii
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Patent number: 4029466Abstract: Metal is evaporated in a container which comprises an electrically conductive ceramic base whose surface in contact with the molten metal is coated with a film comprising, a main component selected from the group consisting of titanium carbide, zirconium carbide, hafnium carbide, vanadium carbide, niobium carbide, tantalum carbide, chromium carbide, molybdenum carbide, tungsten carbide, tungsten metal, tantalum metal and molybdenum metal.Type: GrantFiled: August 8, 1975Date of Patent: June 14, 1977Assignee: Denki Kagaku Kogyo Kabushiki KaishaInventors: Masaji Ishii, Akio Mikogami, Akira Miyai
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Patent number: 4029000Abstract: The cylinder and piston of an injection pump which are severely corroded by molten aluminum or the like are made of a composite sintered body containing two or more of the compounds selected from the group consisting of boron carbide, titanium diboride, zirconium diboride and boron nitride, and having excellent corrosion resistant, wear resistant and heat shock properties and high mechanical strength. One or more of the compounds selected from the group consisting of borides of tantalum, molybdenum and tungsten; carbides of silicon, zirconium, tantalum, vanadium,chromium, tungsten and molybdenum; nitrides of titanium, aluminum, silicon and zirconium; and oxides of aluminum and beryllium may be incorporated.Type: GrantFiled: June 12, 1975Date of Patent: June 14, 1977Assignees: Toshiba Kikai Kabushiki Kaisha, Denki Kagaku Kogyo Kabushiki KaishaInventors: Hiromi Nakamura, Yosizo Komiyama, Mitsuo Yamashita, Masaji Ishii
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Patent number: 4008183Abstract: A high temperature anticorrosive molded product produced by hot pressing a mixture comprising 1-10 weight parts of powdery aluminum and 100 weight parts of a powdery composition comprising an electric conductive refractory, boron nitride and aluminum nitride wherein said powdery composition is encompassed by the range electric conductive refractory : boron nitride : aluminum nitride as shown in the basal triangle of 40 : 20 : 40, 50 : 10 : 40, 70 : 10 : 20, 70 : 20 : 10 and 40 : 50 : 10 of FIG. 1.Type: GrantFiled: August 14, 1975Date of Patent: February 15, 1977Assignee: Denki Kagaku Kogyo Kabushiki KaishaInventors: Masaji Ishii, Akio Mikogami, Tetsuo Torigai