Patents Examined by Ann Knab
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Patent number: 4873064Abstract: Calcined powder of coagulated spherical particles having a secondary coagulated particle size of 0.2 .mu.m to 3 .mu.m, composed of primary particles of less than 500 .ANG. in the crystalline size, and obtained by calcining ultrafine zirconia particles with or without other metal compounds is disclosed. As the ultrafine zirconia particles, coagulated spherical zirconia particles composed of ultrafine monoclinic primary particles of less than 100 .ANG. in the crystalline size, coagulated with each other into a substantially spherical shape with the size of the coagulated particles being in a range from 0.2 .mu.m to 3 .mu.m is preferably used.Type: GrantFiled: March 4, 1986Date of Patent: October 10, 1989Assignee: Nissan Chemical Industries, Ltd.Inventor: Etsuro Kato
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Patent number: 4845061Abstract: Silicon nitride-alumina composite ceramics composed of silicon nitride crystals, .alpha.-alumina crystals and .beta.'-sialon crystals, wherein the silicon nitride crystals and the .beta.'-sialon surrounded the .alpha.-alumina crystals so as to prevent the connection of the .alpha.-alumina crystals. And a method for producing the silicon nitride-alumina composite ceramics which has the steps of preparing a mixture powder composed of 20 to 70 wt % of alumina powder and silicon nitride powder as a remainder, the average particle diameter of the alumina powder being two or more times as large as that of the silicon nitride powder, and firing the mixture powder in an atmosphere of inactive gas.Type: GrantFiled: February 11, 1987Date of Patent: July 4, 1989Assignee: Nippon Soken, Inc.Inventors: Kazuhiro Inoguchi, Novuei Ito, Naochika Nunogaki, Tetsuo Toyama
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Patent number: 4808557Abstract: The present invention is characterized by ceramic materials comprising ceramic sintered bodies consisting of (1) 1-90 wt % chromium carbide and the remainder carbonic titanium nitride; (2) 1-90 wt % chromium carbide, 0.1-5 wt % B.sub.4 C and the remainder titanium carbo-nitride; or (3) either of the above compositions plus less than 95 wt % of a metal boride such as Ti or Zr. Such ceramic sintered bodies are used for cutting tools or wear-resistant machine parts because of their high density, high hardness and high strength.Type: GrantFiled: June 30, 1987Date of Patent: February 28, 1989Assignees: Kyushu Director of Institute, Itaru Todoroki, Tokyo Kokyu Rozai Co., Ltd.Inventors: Tadahiko Watanabe, Kazuhisa Shobu, Yuko Tsuya, Yuji Enomoto, Junshiro Hayakawa, Osamu Yagishita, Hideki Yamamoto, Eiichi Sudoh
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Patent number: 4795263Abstract: A fine aggregate is stored in a high storage silo and its surface water content is so controlled that its variation may be kept within .+-.1% by weight. The fine aggregate, cement and primary water containing an air entraining agent are mixed in an upper mixer (primary mixing) to prepare mortar. The mortar, a coarse aggregate and secondary water containing a water reducing agent are mixed in a lower mixer (secondary mixing) to produce mixed concrete.Type: GrantFiled: February 12, 1985Date of Patent: January 3, 1989Assignees: Sumitomo Corporation, Sobu Ready Mix Concrete Co., Ltd.Inventor: Kikuo Kaga
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Patent number: 4788045Abstract: A fine powder of stabilized zirconia a process for its preparation and application of the powder in ceramic compositions to obtain good mechanical, thermomechanical and electrical properties.A zirconia hydrate sol having a pH between 0.5 and 5 and containing elementary acicular crystals having dimensions of from about 10 to 500 .ANG. which are agglomerated into submicron aggregates of from abuot 100 to 5000 .ANG. in diameter is mixed with a solution of a stabilizing agent, preferably yttrium; the suspension is dried; the dried suspension is calcined at a temperature of from about 700.degree. C. to 1,300.degree. C. for preferably from about 30 minutes to 24 hours; and if needed, the powder obtained is milled.Type: GrantFiled: March 3, 1986Date of Patent: November 29, 1988Assignee: Rhone-Poulenc Specialites ChimiquesInventors: Jean-Francois Colombet, Claude Magnier
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Patent number: 4781759Abstract: A traction aid for snow and ice covered surfaces and method of use are disclosed. The preferred traction aid composition for highways comprises about 90% by weight of between 1/4 inch and 30 mesh hard, crushed limestone and about 10% by weight of 6/30 mesh heat treated ground clay. The preferred composition for sidewalks comprises about 80% by weight 4/30 mesh hard, crushed limestone and about 20% by weight of 6/30 mesh heat treated ground clay.Type: GrantFiled: August 8, 1985Date of Patent: November 1, 1988Inventor: George N. Smith
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Patent number: 4662942Abstract: A cement additive comprising at least two fluidizing agents wherein one of the fluidizing agents is a saponified product of a sulfonated styrene-maleic acid copolymer and the other is one or more of a formalin condensate of naphthalenesulfonic acid and a polyoxyethylene-based compound.The cement additive of this invention is added to a cement composition (cement paste, mortar or concrete) and especially prevents a reduction in the fluidity with a lapse of time.Type: GrantFiled: September 20, 1985Date of Patent: May 5, 1987Assignee: Idemitsu Petrochemical Co., Ltd.Inventors: Yasuharu Koga, Jiro Yasumura, Mitsuo Nagano
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Patent number: 4631062Abstract: A labial pad (30) having an anatomically conformable configuration with a generally ovate geometry defined by a principal longitudinal axis (L), a minor transverse axis (T) and a generally orthogonal lateral or height axis (H), is comprised of a laterally upwardly directed projection (52) lying generally along the longitudinal axis within the posterior region (54) of the pad and having a prominence (64) proximate the distal end (60) thereof tapering toward the proximal end (58) along the longitudinal axis and to the opposed sides (62) along the transverse axis, wherein the projection is configured for disposition within the vestibule (32) of a wearer over a region bounded generally by the posterior labial commissure (36) and the labia terminating at or about the latter and extending forwardly therefrom over the vulva, to occlude the vestibule against flow of menses or the like while protecting the urogenitals from chafing contact.Type: GrantFiled: March 1, 1985Date of Patent: December 23, 1986Assignee: Kimberly-Clark CorporationInventors: Frederich O. Lassen, Robert J. Peerenboom, Cheri L. Schultz
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Patent number: 4627878Abstract: A method for producing a porous magnesia clinker by admixing a magnesia material having a grain size of less than 0.1 mm with from 10 to 60 percent by weight of the mixture of fluid oil coke having a grain size of 1 mm or less, calcining the resulting mixture at a temperature of from 900.degree. to 1600.degree. C. for a time sufficient to burn off the coke and thereby to form pores in the magnesia material, and firing the resulting product at a temperature of from 1600.degree. C. to 2030.degree. C. to produce porous magnesia clinker.Type: GrantFiled: April 11, 1984Date of Patent: December 9, 1986Assignees: Onoda Cement Co., Ltd., Omura Refractories Co., Ltd.Inventors: Hiroshi Hagiwara, Masaru Shirasaka, Tsunenori Moriyama
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Patent number: 4605632Abstract: This invention relates to the production of transparent, high silica glass envelopes for tungsten-halogen lamps consisting essentially, by weight, of 1-2.5% Al.sub.2 O.sub.3, 0.25-1% CaO, 0.1-0.25 Na.sub.2 O and/or K.sub.2 O, 2.5-3.5% B.sub.2 O.sub.3, 0.15-0.3% F, and the remainder SiO.sub.2.Type: GrantFiled: October 24, 1984Date of Patent: August 12, 1986Assignee: Corning Glass WorksInventor: Thomas H. Elmer
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Patent number: 4599319Abstract: New, PbO-free glasses for cathode ray tubes are composed of (in % by weight) 50-52 SiO.sub.2 ; 0-3 Al.sub.2 O.sub.3 ; 1-1.7 Li.sub.2 O; 6.5-10.7 Na.sub.2 O; 0-4.5 K.sub.2 O; 0.4-1.4 F; 0-0.5 TiO.sub.2 ; 0.2-1.2 CeO.sub.2 ; 0-5 ZnO; 0-7.0 BaO; 15-22 SrO; and 6.3-10.3 ZrO.sub.2, and are characterized by a high protective effect against X-rays while having at the same time good resistance to acid and stability to radiation.Type: GrantFiled: July 6, 1984Date of Patent: July 8, 1986Assignee: Schott-GlasswerkeInventor: Werner Sack
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Patent number: 4597796Abstract: A dry one-component alkali metal silicate cement composition contains the following components:(a) condensed aluminum phosphate or condensed aluminum/iron phosphate as hardener in amounts between 2-10% by weight,(b) rounded quartz sand having a grain size between 0.01 and 0.5 mm in amounts of 30-70% by weight,(c) clay constituents in amounts of 10-40% by weight,(d) kieselguhr in amounts of 1-5% by weight,(e) mineral oil in amounts of 0.05-1% by weight and(f) solid pulverulent sodium silicate, potassium silicate or mixtures thereof in amounts of 10-25% by weight.The composition is free of surfactant. When combined with water the cement is slow to set into an acid-resistant mortar.Type: GrantFiled: July 26, 1984Date of Patent: July 1, 1986Assignee: Hoechst AktiengesellschaftInventors: Josef Ernst, Hans-Joachim Semmler
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Patent number: 4597802Abstract: Building material based on hydraulic binder and ballast in the form of a levelling compound intended to be applied to an uneven support. The building material contains a salt which does not essentially effect the strength of the material and is present in such an amount and has such capacity as to reduce the relative equilibrium moisture of the gas phase of the material before drying out to a level of less than about 95%.Type: GrantFiled: April 10, 1984Date of Patent: July 1, 1986Inventors: Johan Alexanderson, Ake Skarendahl
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Patent number: 4595416Abstract: A method and apparatus for producing cement which includes intermixing the cement forming raw materials with water, coal or coke and cement as a binder and forming this mixture of materials into nodules by pelletizing or extrusion. The system is particularly designed for use in making white cement where raw materials low in coloring compound are used as raw feed. The nodules are then sized to obtain a feed material having a size range on the order of one quarter inch by 14 mesh which is suitable for use in a fluidized bed reactor. The nodulized raw material is thermally processed in a fluidized bed reactor at temperatures in the range of approximately 2500.degree. to 2700.degree. F. for white cement and 2350.degree.-2450.degree. F. for typical gray Portland Cement. The coal or coke mixed with the raw material serves to supply between 60% and 90% precent of the fuel required for the process with the remainder being supplied directly to the fludized bed.Type: GrantFiled: October 1, 1984Date of Patent: June 17, 1986Assignee: Fuller CompanyInventor: Sidney M. Cohen
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Patent number: 4576644Abstract: A method of producing cement from raw material containing a harmful substance such as sulphur, alkali and/or chlorine. In order to reduce the circulation of harmful substances a proportion of the gas or material stream is extracted from a zone in the cyclone preheater at which the desired reduction in the content of the harmful substance is achieved with minimum heat loss.Type: GrantFiled: November 14, 1983Date of Patent: March 18, 1986Assignee: Krupp Polysius AGInventor: Wolf Goldmann