Calcium Silicate, E.g., Dicalcium Silicate Or Silicate Hydrate, Tobermorite, Wollastonite, Etc. Patents (Class 106/470)
  • Patent number: 10121607
    Abstract: A separator such as for an electrochemical double layer capacitor includes acicular inorganic particles that are dried to form a porous membrane. Example inorganic particles are calcium silicate particles. A deposition method implementing slurry that includes the acicular inorganic particles and a dispersing medium along with a binder material can be used to form the separator layer directly on electrode materials.
    Type: Grant
    Filed: January 28, 2014
    Date of Patent: November 6, 2018
    Assignee: Corning Incorporated
    Inventors: Felipe Miguel Joos, Satyanarayana Kodali, Atul Kumar, Charles Warren Lander, Kamjula Pattabhirami Reddy, Huthavahana Kuchibhotla Sarma
  • Patent number: 9362560
    Abstract: Silicate cathodes for lithium ion batteries are provided along with methods of forming a silicate. Olivine structures are substituted with a lithium ion. The substituted Olivine structures are combined to form flake-like sheets having an orientation that facilitates passage of lithium ions. Related methods of forming a cathode are provided.
    Type: Grant
    Filed: March 1, 2012
    Date of Patent: June 7, 2016
    Assignee: GM Global Technology Operations LLC
    Inventor: Gholam-Abbas Nazri
  • Patent number: 9174873
    Abstract: The invention relates to an admixture for a cementitious composition comprising microfibrillar cellulose and/or a derivative thereof. The invention also relates to a method of manufacturing said admixture and to the use of the microfibrillar cellulose and/or a derivative thereof in the concrete admixture. The invention further relates to a cementitious composition comprising said admixture and methods of manufacture and use thereof.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: November 3, 2015
    Assignee: UPM-KYMMENE CORPORATION
    Inventors: Antti Laukkanen, Jan-Erik Teirfolk, Markku Leivo, Hannele Kuosa, Kirsi Kataja, Antti Nurmi
  • Patent number: 8685159
    Abstract: An adhesion bond strength enhancer for cementitious adhesive mortar is disclosed. The adhesion enhancer improves bond strength between the mortar and relatively hydrophobic plastic material, such as extruded polystyrene boards and expanded polystyrene boards of the type generally employed in Exterior Insulation Finishing Systems (“EIFS”). Preparation of non-caking, free-flowing, solid dialkyl sulfosuccinate compositions for use as the adhesion enhancer is also disclosed. The adhesion enhancer is attractive for large-scale application in mineral mortar dry-mixes or other solid construction materials. The invention can be used to improve the strength of an adhesive bond between a) gypsum based plaster or stucco and concrete or bricks, b) tile adhesives and concrete, and c) mineral mortars on polystyrene boards, among others.
    Type: Grant
    Filed: September 4, 2013
    Date of Patent: April 1, 2014
    Inventors: Gerald Kratschmer, Jorg Wilken
  • Patent number: 8557036
    Abstract: Methods and compositions are provided that relate to cementing operations, including a method of cementing that may comprise providing a settable composition that may comprise wollastonite, pumice, a calcium-ion source, and water, wherein the wollastonite may be present in an amount in a range of from about 25% to about 75% by combined weight of the wollastonite and pumice, and wherein the pumice may present in an amount in a range of from about 25% to about 75% by combined weight of the wollastonite and pumice. Embodiments of the method further may comprise allowing the settable composition to set.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: October 15, 2013
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Jiten Chatterji, D. Chad Brenneis, Crystal L. Keys
  • Patent number: 8529693
    Abstract: An adhesion bond strength enhancer for cementitious adhesive mortar is disclosed. The adhesion enhancer improves bond strength between the mortar and relatively hydrophobic plastic material, such as extruded polystyrene boards and expanded polystyrene boards of the type generally employed in Exterior Insulation Finishing Systems (“EIFS”). Preparation of non-caking, free-flowing, solid dialkyl sulfosuccinate compositions for use as the adhesion enhancer is also disclosed. The adhesion enhancer is attractive for large-scale application in mineral mortar dry-mixes or other solid construction materials. The invention can be used to improve the strength of an adhesive bond between a) gypsum based plaster or stucco and concrete or bricks, b) tile adhesives and concrete, and c) mineral mortars on polystyrene boards, among others.
    Type: Grant
    Filed: December 10, 2010
    Date of Patent: September 10, 2013
    Assignee: Troy Corporation
    Inventors: Gerald Krätschmer, Jörg Thomas Wilken
  • Publication number: 20130180431
    Abstract: Embodiments are presented herein that provide a filler that is a combination of zeolite and hydrated lime. Addition of this filler to asphalt is more beneficial than addition of either zeolite or hydrated lime alone. The beneficial properties of zeolite include a controlled release of moisture that aids mixture workability and the ability of the asphalt to effectively coat the aggregate particles. The mixture of zeolite and hydrated lime is easier to handle and integrate into a process than use of either compound alone, and it offers a number of other benefits.
    Type: Application
    Filed: July 19, 2012
    Publication date: July 18, 2013
    Inventors: Edward A. Myszak, JR., Flavio Ernesto Ribeiro, Dallas N. Little
  • Publication number: 20100276626
    Abstract: The invention relates to a coating compound for automobile construction, comprising a filler, preferably an aluminum silicate-based filler, which reduces, more particularly prevents, bubbling on transition from the wet state to the dry state.
    Type: Application
    Filed: November 18, 2008
    Publication date: November 4, 2010
    Applicant: EFTEC EUROPE HOLDING AG
    Inventors: Joachim Seitzer, Max Lauchenauer, Heinrich Sommer
  • Patent number: 7776232
    Abstract: A powdery white vulcanization promoter composition which is excellent in storage stability, the resistance of blends thereof with rubbers or the like to heat build-up, and design; and rubber compositions containing the same. Specifically, a vulcanization promoter composition which comprises a modified calcium carbonate (A) surface-treated with a fatty acid or a resin acid and a silicic acid, an inorganic filler (B) exhibiting an oil absorption of as high as 50 to 300 ml/100 g, and a vulcanization promoter component (C) liquid at ordinary temperatures, characterized in that the (A):(B) mixing ratio is within the range of 30:70 to 95:5 and the content of (C) is 30 to 80 wt % based on the whole of the promoter composition.
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: August 17, 2010
    Assignee: Shiraishi Kogyo Kaisha, Ltd.
    Inventors: Takashi Korenaga, Takashi Deguchi, Shoichi Tsutsui
  • Patent number: 7736429
    Abstract: A binder, a composition, a product and a kit, as well as a process for preparing the binder and composition, are directed to a composition useful as an inorganic phosphate binder, which binder is characterized as having calcium silicate sites which are connected the one with the other by alumina-silica phosphate bonds, and a filler.
    Type: Grant
    Filed: February 24, 2009
    Date of Patent: June 15, 2010
    Assignee: Xexos Ltd.
    Inventor: Pakiza Mohammad
  • Patent number: 7648032
    Abstract: Disclosed herein are a method of reductively bleaching a mineral slurry comprising adding in the mineral slurry an effective amount of a formamidine sulfinic acid (FAS) and an effective amount of a borohydride to reductively bleach the mineral slurry, compositions comprising a mineral slurry, a FAS, and a borohydride, and final products comprising a mineral obtained by the method disclosed herein.
    Type: Grant
    Filed: March 22, 2005
    Date of Patent: January 19, 2010
    Assignee: Imerys Pigments, Inc.
    Inventors: Jun Yuan, Robert J. Pruett, Larry C. Powell
  • Patent number: 7611815
    Abstract: An external additive for a toner for electrophotography which contains oxide fine particles which contain silicon, in which the oxide fine particles have a primary particle diameter of 30 nm to 300 nm in number average, a standard deviation ? of a particle size distribution of the primary particle diameter satisfies a relation of: R/4???R, in which the R expresses the primary particle diameter, the oxide fine particles are substantially spherical having a circularity SF1 defined as equation (1) of 100 to 130 and a circularity SF2 defined as equation (2) of 100 to 125; SF1=(L2/A)×(?/4)×100??equation (1) SF2=(P2/A)×(1/4?)×100??equation (2), in the equations, “L” expresses the absolute maximum length of the oxide fine particles; “A” expresses a projected area of the oxide fine particles; and “P” expresses a maximum perimeter of the oxide fine particles.
    Type: Grant
    Filed: July 15, 2003
    Date of Patent: November 3, 2009
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideki Sugiura, Satoshi Mochizuki, Kazuhiko Umemura, Shinya Nakayama, Yasuo Asahina
  • Patent number: 7101614
    Abstract: The fire-protection material for constructions made of concrete and prestressed concrete, especially for tunnels, in the form of prefabricated plates or sprayed-on and cured coatings is prepared from hydraulically curing compositions containing aluminous cement, optionally in admixture with Portland cement, fillers and, if desired, fibers, curing accelerators, curing delayers, plasticizing agents and foaming agents, wherein the cured material contains less than 5% by weight of ettringite and wherein the composition contains from 50 to 200 weight parts of aluminous cement and from 10 to 250 weight parts of xonotlite in the uncured composition.
    Type: Grant
    Filed: October 4, 2001
    Date of Patent: September 5, 2006
    Assignee: Promat International N.V.
    Inventors: Octavian Anton, Xiao Wu
  • Patent number: 6840994
    Abstract: An asbestos free, calcium silicate insulating material suitable for use in the casting of molten non-ferrous metals, and suitable for use in applications where a fire resistant, heat insulating, electrical insulating, and corrosion resistant material is desirable. The calcium silicate insulating material is peoduced by combining lime, a siliceous component, alumina silica microspheres, wollastonite and organic fibrous material in the presence of water to form a slurry. The slurry is then placed under steam pressure, to react the lime, siliceous component and water, dried, and heat treated if necessary.
    Type: Grant
    Filed: July 22, 2002
    Date of Patent: January 11, 2005
    Assignee: BNZ Materials, Inc.
    Inventors: Thomas R. Krowl, Bryan K. Doerr, Michael W. Borski
  • Patent number: 6692678
    Abstract: An asbestos free, calcium silicate insulating material suitable for use in the casting of molten non-ferrous metals, and suitable for use in applications where a fire resistant, heat insulating, electrical insulating, and corrosion resistant material is desirable. The calcium silicate insulating material is produced by combining lime, a siliceous component, alumina silica microspheres, wollastonite and organic fibrous material in the presence of water to form a slurry. The slurry is then placed under steam pressure, to react the lime, siliceous component and water, dried, and heat treated if necessary.
    Type: Grant
    Filed: July 22, 2002
    Date of Patent: February 17, 2004
    Assignee: BNZ Materials, Inc.
    Inventors: Thomas R. Krowl, Bryan K. Doerr, Michael W. Borski
  • Patent number: 6639348
    Abstract: A color cathode ray tube includes an evacuated envelope having a generally rectangular panel portion, a narrow neck portion having a circular cross-section and a funnel portion tapering down from a panel-portion side thereof toward a neck-portion side thereof for connecting the panel portion and the neck portion, a three-color phosphor screen formed on an inner surface of the panel portion, an electron gun housed in the neck portion, and an internal conductive film extending from an inner wall of the neck portion to an inner wall of the funnel portion. The funnel portion is provided with a yoke-mounting portion of generally truncated quadrilateral-pyramidal shape for mounting a beam deflection yoke therearound on the neck-portion side of the funnel portion. The internal conductive film is formed of a first part and a second part, the first part is formed of graphite, metallic oxide and potassium silicate, and the second part is formed of graphite and potassium silicate.
    Type: Grant
    Filed: March 20, 2000
    Date of Patent: October 28, 2003
    Assignees: Hitachi, Ltd, Hitachi Device Engineering Co., Ltd.
    Inventors: Hiroshi Ito, Shunichi Matsumoto, Kiyoshi Sento, Kazuyuki Nishimura, Nobuhiko Hosotani, Masatoshi Akiyama
  • Patent number: 6613138
    Abstract: A manufactured granular substrate composition suitable for use as a carrier for active chemical agents. The composition includes one or more mineral components having a bulk density greater than about 70 pounds per cubic foot. The composition also contains about one or more light weight additives and one or more water soluble binders. The resulting manufactured granular substrate has a bulk density of less than about 55 pounds per cubic foot with a size guide number of about 75 to about 300.
    Type: Grant
    Filed: May 14, 2001
    Date of Patent: September 2, 2003
    Assignees: The National Lime and Stone Co., The Andersons Agriservices, Inc.
    Inventors: James W. Welshimer, Nadine C. Dunn, Timothy D. Birthisel
  • Patent number: 6506248
    Abstract: A formulation for preparing a cementitious product comprising a cementitious material, a siliceous material, and a low bulk density material being substantially calcium silicate hydrate and including unreacted siliceous reactant. A method of forming a cementitious product comprises adding a cementitious material, a siliceous material and a low bulk density material to water to form a slurry, forming a green shaped article from the slurry and curing the article in an autoclave, wherein the low bulk density material is substantially calcium silicate hydrate and includes unreacted siliceous reactant.
    Type: Grant
    Filed: July 17, 2001
    Date of Patent: January 14, 2003
    Assignee: James Hardie Research Pty Limited
    Inventors: Steve Duselis, Peter Goodwin, Nigel Kirby, Basil Naji, Anhthe Nguyen, Brian Sloane, David Stitt, James Gleeson
  • Patent number: 6464771
    Abstract: The invention relates to a hardened calcium silicate material characterized by having Ib/Ia which is greater than 3 (wherein Ib represents the diffraction peak intensity of the tobermorite (220) plane in powdery X-ray diffractometry; and Ia represents the minimum diffraction intensity in the angle region located between two diffraction peaks in the tobermorite (220) and (222) planes;), having a specific gravity of 0.2 or more but less than 0.7, and being substantially free from bubbles having a maximum diameter exceeding 200 &mgr;m; and a process for producing the same.
    Type: Grant
    Filed: August 23, 2000
    Date of Patent: October 15, 2002
    Assignee: Asahi Kasei Kabushiki Kaisha
    Inventors: Kunio Matsui, Tadashi Shimizu
  • Patent number: 6346146
    Abstract: A formulation for preparing a cementitious product comprising a cementitious material, a siliceous material, and a low bulk density material being substantially calcium silicate hydrate and including unreacted siliceous reactant. A method of forming a cementitious product comprises adding a cementitious material, a siliceous material and a low bulk density material to water to form a slurry, forming a green shaped article from the slurry and curing the article in an autoclave, wherein the low bulk density material is substantially calcium silicate hydrate and includes unreacted siliceous reactant.
    Type: Grant
    Filed: April 9, 1998
    Date of Patent: February 12, 2002
    Assignee: James Hardie Research PTY Limited
    Inventors: Steve Duselis, Peter Goodwin, Nigel Kirby, Basil Naji, Anhthe Nguyen, Brian Sloane, David Stitt, James Gleeson
  • Patent number: 6231660
    Abstract: A manufactured granular substrate composition suitable for use as a carrier for active chemical agents. The composition includes about 65 wt % or more of one or more mineral components having a bulk density greater than about 70 pounds per cubic foot. The composition also contains about 5 wt % to about 25 wt % of one or more light weight additives and up to 20 wt % of one or more water soluble binders. The resulting manufactured granular substrate is readily dispersable in water and has a bulk density of less than about 55 pounds per cubic foot with a size guide number of about 100 to about 230.
    Type: Grant
    Filed: June 29, 1999
    Date of Patent: May 15, 2001
    Assignees: The National Lime and Stone Co., The Andersons, Inc.
    Inventors: James W. Welshimer, David L. Ashworth, Peter V. Cawlfield, Nadine C. Dunn, Gerald L. Gingrich, Karissa L. Fox, Kim W. Venable, Paul Weinstein, Timothy D. Birthisel
  • Patent number: 6007616
    Abstract: Disclosed is a system of natural colours consisting of thousands of coloured powders of mineral origin and of materials in or on which pigments have been applied and, afterwards, submitted to at least one thermal treatment and/or irradiation. These natural colours cover the totality of the visible spectrum and offer a great variety of tones, tints and reflections from white to black, including all the rainbow colours. The powders of this system are obtained by mechanical, chemical, thermal and/or physical processes and are used alone or in combination. They are particularly useful to colour materials and, more especially those used in the construction and architectural fields.
    Type: Grant
    Filed: October 8, 1996
    Date of Patent: December 28, 1999
    Inventor: Paulette Tourangeau
  • Patent number: 5997626
    Abstract: A method for reducing the abrasion of a silica-containing calcined kaolin pigment by the controlled leaching of silica from the pigment, preferably by the use of a caustic solution to dissolve the silica out of the calcined kaolin. In another aspect of the invention, the brightness, opacity, or both of a calcined kaolin is increased by increasing the fineness of the kaolin feed supplied to the calciner. The combination of these methods results in the production of a calcined kaolin with low abrasion and high brightness and opacity. Another aspect of the invention concerns an improved method of filtration of dilatent materials such as the leached calcined clay.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: December 7, 1999
    Assignee: Engelhard Corporation
    Inventors: Joseph H. Z. Wu, Michael G. Londo, Mitchell J. Willis, Rene S. Guermonprez, Tracey A. Burbank
  • Patent number: 5997625
    Abstract: A coating pigment composition comprising a hydrous clay, a caustic leached calcined clay, and a porous mineral provides a coating having excellent balance of color intensity and color definition characteristics when printed on by multicolored inks. The pigments of this invention offer a low cost alternative to conventional silica-based coatings in addition to affording other desirable benefits such as improved rheology, less required coat weights, and higher coating solids compared to conventional silica coatings.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: December 7, 1999
    Assignee: Engelhard Corporation
    Inventors: Michael G. Londo, Ahmad Moini, Mitchell R. Gibbs, Stephanie F. Greene
  • Patent number: 5931998
    Abstract: Disclosed is a system of natural colors consisting of thousands of colored powders of mineral origin and of materials in or on which pigments have been applied and, afterwards, submitted to at least one thermal treatment and/or irradiation. These natural colors cover the totality of the visible spectrum and offer a great variety of tones, tints and reflections from white to black, including all the rainbow colors. The powders of this system are obtained by mechanical, chemical, thermal and/or physical processes and are used alone or in combination. They are particularly useful to color materials and, more especially those used in the construction and architectural fields.
    Type: Grant
    Filed: October 8, 1996
    Date of Patent: August 3, 1999
    Inventor: Paulette Tourangeau
  • Patent number: 5908499
    Abstract: Disclosed is a system of natural colors consisting of thousands of colored powders of mineral origin and of materials in or on which pigments have been applied and, afterwards, submitted to at least one thermal treatment and/or irradiation. These natural colors cover the totality of the visible spectrum and offer a great variety of tones, tints and reflections from white to black, including all the rainbow colors. The powders of this system are obtained by a combination of two mechanical, chemical, thermal and/or physical processes and are used alone or in combination. They are particularly useful to color materials and, more especially those used in the construction and architectural fields.
    Type: Grant
    Filed: October 8, 1996
    Date of Patent: June 1, 1999
    Inventor: Paulette Tourangeau
  • Patent number: 5773503
    Abstract: The present invention relates to a compacted mineral filler pellet and a method of making the same. The present invention also relates to a method of making a polymeric compound which includes a compacted mineral filler pellet.
    Type: Grant
    Filed: December 11, 1996
    Date of Patent: June 30, 1998
    Assignee: Luzenac America, Inc.
    Inventors: William P. Steen, David R. Bloomfield
  • Patent number: 5735939
    Abstract: A pigment preparation for anti-corrosion coating materials, comprising(i) 3-40% by weight of a monomeric or polymeric, metal-free or metal-containing chelate-forming compound, preferably a phthalocyanine,(ii) 3-40% by weight of a material in flake form, preferably mica, and(iii) 25-80% by weight of a hydroxide ion-binding material, preferably a metaphosphate, di- or triphosphate. In a further embodiment, the pigment preparation additionally contains 5-65% by weight of a conductive pigment.
    Type: Grant
    Filed: March 31, 1995
    Date of Patent: April 7, 1998
    Assignee: Merck Patent Gesellschaft MIT Beschrankter Haftung
    Inventors: Ralf Glausch, Georg Reinhard, Renate Jircik, Ursula Rammelt
  • Patent number: 5667580
    Abstract: The disclosure describes pigment compositions containing an organic pigment and a transparent filler having a mean particle size less than 10 .mu.m and a narrow particle size distribution; as well as methods of preparing the pigment compositions. The pigment compositions are useful for pigmenting high-molecular-weight organic materials; especially coating compositions, curable ink systems, plastics, as well as for use in laser marking applications.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: September 16, 1997
    Assignee: Ciba-Geigy Corporation
    Inventor: Fridolin Babler
  • Patent number: 5578120
    Abstract: A laser beam absorbing resin composition is disclosed which includes 100 parts by weight of a resin, and 1-100 parts by weight of composite particles having an average particle diameter of 0.1-50 .mu.m and each including a particulate, laser beam absorbing inorganic substance, and a colorant physically bonded directly to the inorganic substance and capable of discoloring upon being heated at a temperature of 250.degree. C. or more, the weight ratio of the colorant to the inorganic substance being in the range of 1:99 to 50:50. By irradiating a shaped, hardened body of the above composition with a laser beam, the colorant is thermally decomposed, so that the color of the irradiated surface is changed and becomes discriminative from that of non-irradiated surface.
    Type: Grant
    Filed: February 15, 1996
    Date of Patent: November 26, 1996
    Assignee: Somar Corporation
    Inventors: Jun Takahashi, Masaaki Toyoda, Akira Yasuda, Hideo Ochi
  • Patent number: 5547502
    Abstract: Uniquely dispersible precipitated silica particulates, e.g., beads, powders and granulates/extrudates, very well suited for the reinforcement of elastomer/rubber matrices, e.g., tires for the automotive industry, have characteristic particle sizes, BET and CTAB specific surface areas, DOP oil absorption values, total pore volumes and pore size distributions, and reduced degree of attrition.
    Type: Grant
    Filed: November 16, 1994
    Date of Patent: August 20, 1996
    Assignee: Rhone-Poulenc Chimie
    Inventors: Yvonick Chevallier, Michel Rabeyrin
  • Patent number: 5380359
    Abstract: A melanin-coated pigment obtained by coating a carrier with a readily alkali-soluble natural melanin, and a cosmetic containing the pigment are provided. The melanin-coated pigment is highly safe and has high coloring and high saturation tone, and a cosmetic which contains it is also expected to have ultraviolet-ray-absorbing and anti-oxidizing effects.
    Type: Grant
    Filed: November 24, 1993
    Date of Patent: January 10, 1995
    Assignee: Kyowa Hakko Kogyo Co., Ltd.
    Inventors: Shinkichi Honda, Yoichiro Takekoshi, Yoichiro Arai
  • Patent number: 5160375
    Abstract: A coating composition for a cathode ray tube, comprising the ingredients of: silica powder which has been fused during the process of flame spraying, said silica powder having an average particle size of about 0.02 to about 15 microns, electrically conductive graphite powder, with the pigment ratio of silica to graphite being within the range of 0.1 to 15, an organic thickening agent, water glass, and the balance water, said coating composition having a viscosity within the range of about 270 to about 850 cps; and wherein the coating provides markedly improved intercoat adhesion between overlapping coatings on the interior funnel of the cathode ray tube.
    Type: Grant
    Filed: February 2, 1990
    Date of Patent: November 3, 1992
    Assignee: Acheson Industries, Inc.
    Inventor: Shiro Otaki
  • Patent number: 4863521
    Abstract: An aqueous solution of the monocarboxylates of Y, Ba, and Cu is spray dried, providing a contaminant-free non-hygroscopic product which is homogeneous at the atomic level. In a preferred embodiment Y, Ba, and Cu acetates are used in a molecular ratio of 1:2:3, giving a product which can be calcined to give a superconducting mixed oxide, YBa.sub.2 Cu.sub.3 O.sub.x, where x is 6.8-7.0.
    Type: Grant
    Filed: July 7, 1988
    Date of Patent: September 5, 1989
    Assignee: W. R. Grace & Co.-Conn.
    Inventor: Jacob Block
  • Patent number: 4842647
    Abstract: The present invention offers a mould additive for continuous casting of steel characterized by having a fully spherical shape in which average particle size is in the range of 100 to 800 .mu.m.
    Type: Grant
    Filed: February 10, 1988
    Date of Patent: June 27, 1989
    Assignee: Shinagawa Refractories Co., Ltd.
    Inventors: Kenji Ichikawa, Osamu Nomura, Yoichiro Kawabe, Koyo Yanagawa