Patents Examined by Mark Bell
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Patent number: 4439531Abstract: CdO- and ThO-free, highly refractive optical glass having a refractive index of 1.85-2.05 and an Abbe index of 25-43, characterized by the following composition (in percent by weight):______________________________________ SiO.sub.2 5-15 B.sub.2 O.sub.3 2.5-8 SiO.sub.2 + B.sub.2 O.sub.3 7-23 SiO.sub.2 /B.sub.2 O.sub.3 1.3-2.1 La.sub.2 O.sub.3 43-56 Gd.sub.2 O.sub.3 0-14 La.sub.2 O.sub.3 + Gd.sub.2 O.sub.3 43-60 ZrO.sub.2 3-10 Nb.sub.2 O.sub.5 0-15 Ta.sub.2 O.sub.5 0-20 Nb.sub.2 O.sub.5 + Ta.sub.2 O.sub.Type: GrantFiled: July 22, 1982Date of Patent: March 27, 1984Assignee: Schott GlaswerkeInventors: Karl Mennemann, Volkmar Geiler
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Patent number: 4438213Abstract: Magnetic head slider material consisting of 5.about.10 percent by weight of silicon, 1.3.about.7.8 percent by weight of tungsten silicide and essentially balanced silicon carbide. And it is method for producing said magnetic head slider material that at the time of which the mixed powder consisting of silicon carbide, carbon and tungsten is sintered, cellulose is also mixed with said mixed powder and sintered together at the same time. And then fibrous micropores are caused to the sintered body by the above-described sintering, after that molten metallic silicon infiltrated into fibrous micropores.Type: GrantFiled: August 31, 1982Date of Patent: March 20, 1984Assignees: Nippon Tungsten Co., Ltd., Sumitomo Special Metals Co., Ltd.Inventors: Mitsuhiki Furukawa, Michito Miyahara, Takashi Kitahira, Kiyohito Misumi, Masaharu Shiroyama, Toshiaki Wada
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Patent number: 4438210Abstract: This invention is directed to transparent, essentially colorless glass-ceramic articles containing .beta.-quartz solid solution as the predominant crystal phase consisting essentially, expressed in terms of weight percent on the oxide basis, ofSiO.sub.2 --65-75,Li.sub.2 O--1-4,Al.sub.2 O.sub.3 --15-25,ZnO--0.5-2,Na.sub.2 O and/or K.sub.2 O--0-2,TiO.sub.2 --2-6,ZrO.sub.2 --0-2,BaO--0--0-2.5,F--0-1.2,Fe.sub.2 O.sub.3 -->0.01-<0.1,Through ion exchange reactions the article can be made highly resistant to attack by the atmospheres in coal and wood burning stoves.Type: GrantFiled: December 20, 1982Date of Patent: March 20, 1984Assignee: Corning Glass WorksInventor: Hermann L. Rittler
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Patent number: 4438214Abstract: Semiconductive ceramic materials suitable for use in varistors, consisting essentially of a major proportion of Sr.sub.(1-x) Ca.sub.x TiO.sub.3, where x is from about 0.01 to about 0.50, the balance being at least one of Nb.sub.2 O.sub.5, Ta.sub.2 O.sub.5, WO.sub.3, La.sub.2 O.sub.3, CeO.sub.2, Nd.sub.2 O.sub.3, Y.sub.2 O.sub.3, Sm.sub.2 O.sub.3, Pr.sub.6 O.sub.11 and Dy.sub.2 O.sub.3, and Na.sub.2 O. The ceramic materials may further comprise a minor proportion of at least one of Ag.sub.2 O, CuO, MnO.sub.2 and SiO.sub.2, and/or a minor proportion of Al.sub.2 O.sub.3. For the fabrication of ceramic bodies of the above compositions there are prepared mixtures of the noted ingredients in powdered form in various possible combinations, plus an organic binder. The mixtures are molded under pressure into desired shape. The moldings are first fired in a reductive or neutral atmosphere and then refired in an oxidative atmosphere. Na.sub.2 O can be included in the initial mixtures in the form of Na.sub.Type: GrantFiled: November 12, 1982Date of Patent: March 20, 1984Assignee: Taiyo Yuden Co., Ltd.Inventors: Masaru Masuyama, Susumu Hirooka, Nobutatsu Yamaoka
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Patent number: 4436831Abstract: A calcined member for arc-extinguishing chambers which are installed in electromagnetic contactors and magnetic circuit breakers for high-voltage applications. The calcined member consists of an inorganic composite material obtained by molding and heat-treating a starting material under pressurized condition, the starting material comprising 10 to 50% by weight of a mica powder as a base material, 10 to 50% by weight of a magnesium oxide as a charging material, and 25 to 60% by weight of a mixture powder of boric acid, boric anhydride and zinc oxide as a binder.Type: GrantFiled: July 15, 1982Date of Patent: March 13, 1984Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Shizutaka Nishizako, Isao Ishii, Yoshiaki Sakamoto
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Patent number: 4435513Abstract: There is disclosed a sintered body of aluminum nitride comprising a sintered body of powder mixture containing(a) AlN powder: 100 parts by weight,(b) at least one compound selected from CaO, BaO, SrO and a compound capable of being converted into one of these oxides by sintering : 0.05 to 6 parts by weight, and(c) carbon powder or powder of a compound capable of being converted into carbon by sintering : more than 0 to not more than 7 parts by weight.The sintered bodies of aluminum nitride according to this invention have high density and excellent properties such as high thermal conductivity.Type: GrantFiled: September 21, 1982Date of Patent: March 6, 1984Assignee: Tokyo Shibaura Denki Kabushiki KaishaInventors: Katsutoshi Komeya, Akihiko Tsuge, Hiroshi Inoue
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Patent number: 4435514Abstract: A chromia-magnesia based refractory product made up of fused chromia-magnesia grains bonded by an in situ formed chromia-magnesia bond. The product is very dense and especially suitable when used to process molten materials which involve coal slag.Type: GrantFiled: July 6, 1982Date of Patent: March 6, 1984Assignee: Norton CompanyInventor: Stephen D. Hartline
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Patent number: 4435264Abstract: Backfills for magnesium galvanic anodes are prepared by blending calcium sulfite, B(OH).sub.3, and bentonite, wherein the bentonite contains a substantial amount of alkaline earth metal bentonite, such as calcium-bentonite.Type: GrantFiled: March 1, 1982Date of Patent: March 6, 1984Assignee: The Dow Chemical CompanyInventor: Philip Y. Lau
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Patent number: 4435263Abstract: A magnesium anode backfill composition is prepared by mixing calcium sulfite, bentonite, and at least one compound selected from the group comprising sodium alkylates and sodium dialkyldithiocarbamates, wherein said bentonite contains a substantial amount of alkaline earth metal bentonite, such as calcium-bentonite.Type: GrantFiled: March 1, 1982Date of Patent: March 6, 1984Assignee: The Dow Chemical CompanyInventor: Philip Y. Lau
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Patent number: 4435482Abstract: The present invention aims to provide a sliding member: to be operated under a high load and high sliding speed; having high impact resistance and high break-in property; to be highly resistant and stable under boundary lubricating conditions, and; to be engaged with the swash plate made of iron or aluminum in a swash plate type compressor. The sliding member of the present invention comprises:a base comprising an iron-based alloy, and;a bearing layer, consolidated to said base and formed by applying on said base a powder coating having a thickness not more than 0.5 mm, and then baking said coating, said powder consisting of an iron family element and an additive component which includes from 3 to 30% by weight of boron.Type: GrantFiled: February 25, 1981Date of Patent: March 6, 1984Assignee: Taiho Kogyo Co., Ltd.Inventors: Kenichiro Futamura, Eiji Asada, Tatsuhiko Fukuoka
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Patent number: 4435512Abstract: A process for producing a cordierite ceramic product comprises blending a starting cordierite composition which comprises:(a) a clay formulation having a cordierite composition comprising kaolin, talc and aluminium oxide and/or an aluminium compound which is convertible into aluminium oxide;(b) a glass having a cordierite composition;(c) an organic binder; and,(d) water.Type: GrantFiled: November 24, 1981Date of Patent: March 6, 1984Assignees: Nippondenso Co., Ltd., Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Kazuyuki Ito, Masami Ouki, Naoto Miwa, Osami Kamigaito, Haruo Doi, Yoshiharu Hirose
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Patent number: 4434239Abstract: A process for the manufacture of industrial cordierite ceramic units containing from 45 to 68% by weight of silica 16 to 37% by weight of magnesia and 12 to 45% by weight of alumina which comprises (a) mixing from 15 to 60% by weight of the non-magnetic fraction of asbestos tailings having a MgO:SiO.sub.2 of from 0.8 to 1.25 with 40 to 85% of a kaolin clay by weight and 0 to 10% of alumina; (b) shaping said mixture in green unit forms; (c) curing said units at room temperature for 24 h then at 110.degree. C. for 24 h; (d) firing said cured units at a temperature of from 1350 1400.degree. C.Type: GrantFiled: February 18, 1983Date of Patent: February 28, 1984Assignee: Universite De MontrealInventor: Pierre C. Aitcin
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Patent number: 4432957Abstract: A significant improvement of the silicon impregnation depth of a carbon precursor body in the siliconizing thereof to make a silicon carbide body is obtained, as well as an accelerated conversion into silicon carbide if activated carbon is used in whole or in part as the carbon powder component of the precursor body. The molding material is preferably 20 to 60% by weight of binder and 20 to 70% activated carbon. This molding material may also usefully contain 10 to 60% by weight of .alpha.-silicon carbide, which may be previously made by siliconizing carbon powder.Type: GrantFiled: February 24, 1982Date of Patent: February 21, 1984Assignee: Kernforschungsanlage Julich Gesellschaft mit beschrankter HaftungInventors: Ashok K. Gupta, Erno Gyarmati, Hermann Kreutz, Rudolf Munzer, Aristides Naoumidis, Hubertus Nickel
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Patent number: 4432891Abstract: Sulfide glasses capable of conducting alkali metal ions are prepared from a nonmetal glass former such as GeS.sub.2, B.sub.2 S.sub.3 and SiS.sub.2 in mixture with a glass modifier such as Na.sub.2 S or another alkali metal sulfide. A molten mixture of the constituents is rapidly quenched to below the glass transition temperature by contact with a metal mold. The rapid quench is sufficient to prevent crystallization and permit solidification as an amorphous solid mixture. An oxygen-free atmosphere is maintained over the mixture to prevent oxidation. A new glass system of (1-X) Na.sub.2 O:XB.sub.2 S.sub.3 is disclosed.Type: GrantFiled: May 6, 1982Date of Patent: February 21, 1984Assignee: The United States of America as represented by the United States Department of EnergyInventors: Sherman Susman, Charles J. Delbecq, Kenneth J. Volin, Leah Boehm
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Patent number: 4430386Abstract: A composite metal sintered article combining a metal shell which has been electroformed and/or electroless plated and/or vapor deposited, positioned inside or outside of a metal sintered compact. A method of making the composite metal sintered article using both a powder metallurgy process and a surface treating process. This composite metal sintered article has excellent surface properties and high dimensional accuracy and is favorably used for many kinds of forming molds, dies and structural members, especially for press molds in making glassware.Type: GrantFiled: December 8, 1980Date of Patent: February 7, 1984Assignee: Toyo Kohan Co., Ltd.Inventors: Tadao Watanabe, Mitsuo Ohhori, Akio Ohta, Yoshikazu Kondo
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Patent number: 4429052Abstract: With the fabrication of a substrate material in the form of alkaline-earth gallate single crystals it has become possible to grow monocrystalline barium hexaferrite layers of high quality. These thin barium hexaferrite layers on the alkaline-earth gallate substrates are extremely suited as magnetic devices because of their very high uniaxial anisotropy and their small line width. Such magnetic devices can be used for passive microwave components, e.g. as resonance isolators or filters in the centimeter wavelength range or as components in information storage technology, e.g. in magnetic cylindrical domain devices, especially in the field of very small (submicron) cylindrical domains.Type: GrantFiled: July 6, 1982Date of Patent: January 31, 1984Assignee: U.S. Philips CorporationInventors: Dieter W. Mateika, Gunter Bartels
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Patent number: 4427517Abstract: A mixture of CaSO.sub.3 and bentonite, where the bentonite contains a substantial amount of alkaline earth metal bentonite, e.g., Ca-bentonite, is useful as a backfill composition for underground magnesium galvanic anodes. The backfill may optionally, and beneficially, contain sodium sulfite.Type: GrantFiled: March 1, 1982Date of Patent: January 24, 1984Assignee: The Dow Chemical CompanyInventor: Philip Y. Lau
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Patent number: 4420543Abstract: In a bearing member of an internal combustion engine, having a flame sprayed surface, molybdenum or tungsten carbide is known as the material of the flame spray. The present invention aims to provide, for example a flame-sprayed piston ring with good heat-and-wear-resistance as well as a property of not seriously wearing the engine cylinder or cylinder liner. The flame sprayed layer of the present invention is composed of mainly ferrochrome powder and plus a powder of a self fluxing alloy, and additionally molybdenum. The piston ring of the present invention is suitable for heavy duty internal combustion engines, in which wear of the piston ring and cylinder are severe.Type: GrantFiled: November 3, 1980Date of Patent: December 13, 1983Assignees: Toyota Jidosha Kogyo Kabushiki Kaisha, Teikoku Piston Ring Co., Ltd.Inventors: Katsumi Kondo, Yoshio Fuwa, Akira Harayama, Toru Nakahora
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Patent number: 4415464Abstract: A Faraday rotation glass comprising, in mole %,______________________________________ P.sub.2 O.sub.5 5 to 30% where up to 5/6 on a molar basis of the P.sub.2 O.sub.5 can be replaced by B.sub.2 O.sub.3 ; TbF.sub.3 11.4 to 45%; AlF.sub.3 0 to 25%; and RF at least 40% ______________________________________where RF includes at least 3% BaF.sub.2, 0 to 64% MgF.sub.2, 0 to 32% NaF, 0 to 40% SrF.sub.2, 0 to 26% CaF.sub.2, 0 to 20% LiF and 0 to 20% KF.Type: GrantFiled: March 12, 1982Date of Patent: November 15, 1983Assignee: Hoya CorporationInventors: Yoshiyuki Asahara, Tetsuro Izumitani
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Patent number: 4415672Abstract: The instant invention is directed to the preparation of glass-ceramic bodies exhibiting high strengths and use temperatures up to 1200.degree. C. The bodies consist essentially, expressed in terms of weight percent on the oxide basis, of______________________________________ Li.sub.2 O 1.5-5 Al.sub.2 O.sub.3 15-25 SiO.sub.2 60-75 ZrO.sub.2 1-5 Nb.sub.2 O.sub.5 0-10 Ta.sub.2 O.sub.5 0-10 Nb.sub.2 O.sub.5 + Ta.sub.2 O.sub.5 1-10 MgO 0-10 ______________________________________where excellent resistance to oxidation up to temperatures of 1200.degree. C. is desired, 0.5-3% As.sub.2 O.sub.3 will be included in the composition.Type: GrantFiled: May 20, 1982Date of Patent: November 15, 1983Assignee: Corning Glass WorksInventors: John J. Brennan, Kenneth Chyung, Mark P. Taylor