Patents by Inventor Hideki Kazama
Hideki Kazama 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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Publication number: 20080293011Abstract: A mucosal adjustment material comprising a combination of a powdery material (a) and a liquid material (b), characterized especially in that a noncrosslinked (meth)acrylic polymer powder having a Tg in the range of 0-60° C., e.g., polybutyl methacrylate, is used as the powdery material and a liquid polymer which has a mass-average molecular weight of 1,000-10,000 and in which the content of oligomers having a molecular weight of 500 or lower is 10 mass % or lower is used as the liquid material. Such powdery material and liquid material are kneaded together to prepare a paste, which is applied to a denture base and used as a temporary relining material. This mucosal adjustment material in a paste form is reduced in the amount of ingredients eluted from the material during use in the mouth. In an ordinary use period, the relining material retains its initial flexibility and does not deteriorate the denture base.Type: ApplicationFiled: February 2, 2006Publication date: November 27, 2008Applicants: TOKUYAMA CORPORATION, TOKUYAMA DENTAL CORPORATIONInventors: Masanao Hashiguchi, Mitsuhiro Yamashita, Hideki Kazama
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Publication number: 20080244486Abstract: An integrated-circuit generating device for generating an integrated circuit including an adjusting mechanism for adjusting timings of values sequentially outputted from circuits operating in parallel.Type: ApplicationFiled: January 24, 2008Publication date: October 2, 2008Applicant: SONY CORPORATIONInventor: Hideki KAZAMA
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Patent number: 7365106Abstract: A cationically curable composition for dental use containing a cationic polymerization initiator (I) and cationically polymerizable monomers (II), the cationically polymerizable monomers (II) containing an oxetane compound and an epoxy compound or an alkenyl ether compound at a ratio of amounts that satisfy the conditions expressed by the following formula, (a×A):(b×B)=91:9 to 45:55 wherein A is a mol number of the oxetane compound, “a” is an average number of the oxetane functional group contained in one molecule of the oxetane compound, B is a mol number of the epoxy compound or the alkenyl ether compound, and “b” is an average number of the epoxy functional group contained in one molecule of the epoxy compound or an average number of the alkenyl ether functional group contained in one molecule of the alkenyl ether compound.Type: GrantFiled: April 26, 2005Date of Patent: April 29, 2008Assignees: Tokuyama Corporation, Tokuyama Dental CorporationInventors: Takeshi Suzuki, Hideki Kazama
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Publication number: 20060247328Abstract: A curable composition comprising: (A) 100 parts by mass of a monomer component which comprises a radically polymerizable monomer and has a water absorbing capacity of not larger than 20% by weight; (B) 0.5 to 10 parts by mass of water; (C) 0.1 to 20 parts by mass of a surfactant; and (D) an effective amount of a radical polymerization initiator. The curable composition is cured by polymerization in a state where a water layer is formed on the surfaces of the cured body that is being formed, effectively suppressing the hindrance of polymerization caused by oxygen and decreasing the formation of unpolymerized product on the surfaces of the cured body. The curable composition is particularly useful as a dental restorative which involves difficulty when it is to be polymerized while shutting off oxygen.Type: ApplicationFiled: March 17, 2006Publication date: November 2, 2006Applicants: TOKUYAMA CORPORATION, TOKUYAMA DENTAL CORPORATIONInventors: Seiji Nakata, Naoki Kakiuchi, Hideki Kazama
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Patent number: 7084182Abstract: A photopolymerization initiator comprising (A) an ?-diketone compound such as camphorquinone, (B1) an aliphatic amine compound such as triethanolamine or N-methyldiethanolamine, (B2) an aromatic amine compound such as ethyl p-dimethylaminobenzoate or N,N-dimethyl p-toluidine, and (C) a triazine compound substituted with a trihalomethyl group, such as 2,4,6-tris(trichloromethyl)-s-triazine or 2-phenyl-4,6-bis(trichloromethyl)-s-triazine. The photopolymerization initiator remains stable against the environmental light such as the indoor illumination light from a fluorescent lamp or the dental light illuminating the interior of the oral cavity, is excellently handled, is quickly cured by the irradiation with an intense light emitted from a light irradiator for polymerization, provides a cured body having excellent properties, can be stably preserved even at high temperatures, and is very useful as a dental composite resin.Type: GrantFiled: March 11, 2004Date of Patent: August 1, 2006Assignees: Tokuyama Corporation, Tokuyama Dental CorporationInventors: Tadashi Hara, Takeshi Suzuki, Rumiko Shimada, Hideki Kazama, Hironobu Akizumi, Mutsumi Kashimura
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Patent number: 7041714Abstract: A dental adhesive containing an acidic group-containing radically polymerizable monomer, a non-acidic radically polymerizable monomer, a chemical polymerization initiator and a filler, as well as a 2,4-diphenyl-4-methyl-1-pentene. When the dental adhesive is used for adhering a crown restorative to the tooth, an excess of cement swelling from the surface of adhesion can be favorably removed, the curing time can be suitably adjusted without decreasing the strength of adhesion to the tooth, and a change in the color tone of the cured body can be effectively suppressed.Type: GrantFiled: October 7, 2002Date of Patent: May 9, 2006Assignees: Tokuyama Corporation, Tokuyama Dental CorporationInventors: Hiroshi Takeshita, Emi Ishida, Hideki Kazama
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Publication number: 20050250868Abstract: A cationically curable composition for dental use containing a cationic polymerization initiator (I) and cationically polymerizable monomers (II), the cationically polymerizable monomers (II) containing an oxetane compound and an epoxy compound or an alkenyl ether compound at a ratio of amounts that satisfy the conditions expressed by the following formula, (a×A):(b×B)=91:9 to 45:55 wherein A is a mol number of the oxetane compound, “a” is an average number of the oxetane functional group contained in one molecule of the oxetane compound, B is a mol number of the epoxy compound or the alkenyl ether compound, and “b” is an average number of the epoxy functional group contained in one molecule of the epoxy compound or an average number of the alkenyl ether functional group contained in one molecule of the alkenyl ether compound.Type: ApplicationFiled: April 26, 2005Publication date: November 10, 2005Applicants: Tokuyama Corporation, Tokuyama Dental CorporationInventors: Takeshi Suzuki, Hideki Kazama
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Patent number: 6933327Abstract: A dental polymerizable and curable composition that can be used as a dental composite restorative featuring excellent handling property at the time of filling, a small contraction upon polymerization, a high bending strength, excellent surface smoothness and wear resistance, and a very good matching of color tone to the natural tooth after restored.Type: GrantFiled: August 16, 2001Date of Patent: August 23, 2005Assignee: Tokuyama CorporationInventors: Junichiro Yamakawa, Hideki Kazama
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Patent number: 6930134Abstract: A photocationic polymerization initiator comprising (A) a photo acid-generating compound and (B) a fused polycyclic aromatic compound, wherein said fused polycyclic aromatic compound has a molecular structure in which a fused aromatic ring is further condensed with a non-aromatic ring, and at least one of the atoms constituting said non-aromatic ring directly bonded to a common atom in the fused aromatic ring and the non-aromatic ring, is a saturated carbon atom, said saturated carbon atom having at least one hydrogen atom. Upon blending the photopolymerizable monomer with the photocationic polymerization initiator, there is obtained a photocationically polymerizable composition having a high sensitivity for the visible light rays, which is useful for dental applications, exhibiting a sufficiently high curing rate and offering sufficient depth of curing upon the irradiation with light for only a short period of time.Type: GrantFiled: November 12, 2003Date of Patent: August 16, 2005Assignees: Tokuyama Corporation, Tokuyama Dental CorporationInventors: Takeshi Suzuki, Hideki Kazama
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Patent number: 6849670Abstract: A photocurable dental restorative comprising (i) 100 parts by weight of a polymerizable monomer, (ii) 0.01 to 5 parts by weight of a photopolymerization initiator of acylphosphine oxide, and (iii) 200 to 1900 parts by weight of an inorganic filler, wherein the inorganic filler (iii) is a mixed filler of: (A) irregular-shaped inorganic particles having an average particle size of not smaller than 0.1 ?m but smaller than 1 ?m; (B) spherical inorganic particles having an average primary particle size of not smaller than 0.1 ?m but not larger than 5 ?m; and (C) fine inorganic particles having an average primary particle size of not larger than 0.1 ?m; which are so blended as to satisfy the following mass ratios {circle around (1)} to {circle around (3)}: {circle around (1)} mA/(mB+mC)=0.2 to 3 {circle around (2)} mB/(mB+mC)=0.5 to 0.99 {circle around (3)} mC/(mB+mC)=0.01 to 0.5 where mA, mB and mC are masses of the inorganic particles (A) to (C).Type: GrantFiled: July 19, 2001Date of Patent: February 1, 2005Assignee: Tokuyama CorporationInventors: Takeshi Satoh, Masataka Himeno, Hideki Kazama
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Publication number: 20050009946Abstract: According to the present invention, there are disclosed a radical polymerization catalyst comprising an aryl borate compound, an acidic compound and a +tetravalent and/or +pentavalent vanadium compound; and a curable composition, a dental composition, a dental adhesive, a dental pretreatment agent, a dental adhesive kit, etc. all containing the radical polymerization catalyst.Type: ApplicationFiled: September 20, 2002Publication date: January 13, 2005Inventors: Makoto Oguri, Hideki Kazama, Mikio Kimura, Kazuya Ibaragi, Kyouichi Fuzinami, Takeshi Satoh
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Patent number: 6815470Abstract: A dental catalyst for chemical polymerization comprising an acidic compound, an organic peroxide such as cumene hydroperoxide, and aryl borate compound such as sodium tetraphenylborate, but without substantially containing amine compound. This catalyst is chemically highly stable, is easy to handle, is highly active, is less likely to be impaired by polymerization, and does not cause the cured product to be tinted or discolored, and is very useful for the dental restorative.Type: GrantFiled: July 2, 2003Date of Patent: November 9, 2004Assignee: Tokuyama CorporationInventors: Kazuya Ibaragi, Hideki Kazama, Makoto Oguri
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Publication number: 20040186195Abstract: A photopolymerization initiator comprising (A) a photo acid-generating compound such as diaryliodonium salt (e.g., diphenyl iodonium, bis(p-chlorophenyl)iodonium, etc.), (B) a photo oxidation radical-generating compound such as diarylketone compound, &agr;-diketone compound or ketocoumarin compound, and (C) a fused polycyclic aromatic compound such as 1,4-dimethylnaphthalene, 1-methylanthracene, 9-methylanthracene, 9,10-dimethylanthracene or 9,10-diethylanthracene. The photopolymerization initiator makes it possible to efficiently polymerize the cationically polymerizable monomer by the irradiation with visible light.Type: ApplicationFiled: December 18, 2003Publication date: September 23, 2004Inventors: Takeshi Suzuki, Hideki Kazama
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Publication number: 20040180983Abstract: A photopolymerization initiator comprising (A) an &agr;-diketone compound such as camphorquinone, (B1) an aliphatic amine compound such as triethanolamine or N-methyldiethanolamine, (B2) an aromatic amine compound such as ethyl p-dimethylaminobenzoate or N,N-dimethyl p-toluidine, and (C) a triazine compound substituted with a trihalomethyl group, such as 2,4,6-tris(trichloromethyl)-s-triazine or 2-phenyl-4,6-bis (trichloromethyl)-s-triazine. The photopolymerization initiator remains stable against the environmental light such as the indoor illumination light from a fluorescent lamp or the dental light illuminating the interior of the oral cavity, is excellently handled, is quickly cured by the irradiation with an intense light emitted from a light irradiator for polymerization, provides a cured body having excellent properties, can be stably preserved even at high temperatures, and is very useful as a dental composite resin.Type: ApplicationFiled: March 11, 2004Publication date: September 16, 2004Inventors: Tadashi Hara, Takeshi Suzuki, Rumiko Shimada, Hideki Kazama, Hironobu Akizumi, Mutsumi Kashimura
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Publication number: 20040132853Abstract: A photocationic polymerization initiator comprising (A) a photo acid-generating compound and (B) a fused polycyclic aromatic compound, wherein said fused polycyclic aromatic compound has a molecular structure in which a fused aromatic ring is further condensed with a non-aromatic ring, and at least one of the atoms constituting said non-aromatic ring directly bonded to a common atom in the fused aromatic ring and the non-aromatic ring, is a saturated carbon atom, said saturated carbon atom having at least one hydrogen atom. Upon blending the photopolymerizable monomer with the photocationic polymerization initiator, there is obtained a photocationically polymerizable composition having a high sensitivity for the visible light rays, which is useful for dental applications, exhibiting a sufficiently high curing rate and offering sufficient depth of curing upon the irradiation with light for only a short period of time.Type: ApplicationFiled: November 12, 2003Publication date: July 8, 2004Inventors: Takeshi Suzuki, Hideki Kazama
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Patent number: 6759449Abstract: This invention discloses a dental adhesive composition comprising (A) a polymerizable monomer comprising an acidic-group containing polymerizable monomer such as 11-methacryloyloxy-1,1-undecane dicarboxylic acid, (B) a mixed filler of a spherical filler substantially consisting of a non-crosslinking polymethyl methacrylate and a spherical filler substantially consisting of a non-crosslinking polyethyl methacrylate; and (C) a polymerization initiator; and a dental adhesive kit comprising the above dental adhesive composition in combination with a dental primer comprising (D) an acidic-group containing polymerizable monomer, (E) an aryl borate, (F) an organosulfinic acid salt and (G) water. The dental adhesive composition exhibits good operability and improved adhesion performance.Type: GrantFiled: July 23, 2002Date of Patent: July 6, 2004Assignees: Tokuyama Dental Corporation, Tokuyama CorporationInventors: Mikio Kimura, Koji Matsushige, Hideki Kazama
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Publication number: 20040077746Abstract: A dental adhesive containing an acidic group-containing radically polymerizable monomer, a non-acidic radically polymerizable monomer, a chemical polymerization initiator and a filler, as well as a 2,4-diphenyl-4-methyl-1-pentene. When the dental adhesive is used for adhering a crown restorative to the tooth, an excess of cement swelling from the surface of adhesion can be favorably removed, the curing time can be suitably adjusted without decreasing the strength of adhesion to the tooth, and a change in the color tone of the cured body can be effectively suppressed.Type: ApplicationFiled: August 13, 2003Publication date: April 22, 2004Inventors: Hiroshi Takeshita, Emi Ishida, Hideki Kazama
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Publication number: 20040006154Abstract: A dental catalyst for chemical polymerization comprising an acidic compound, an organic peroxide such as cumene hydroperoxide, and aryl borate compound such as sodium tetraphenylborate, but without substantially containing amine compound. This catalyst is chemically highly stable, is easy to handle, is highly active, is less likely to be impaired by polymerization, and does not cause the cured product to be tinted or discolored, and is very useful for the dental restorative.Type: ApplicationFiled: July 2, 2003Publication date: January 8, 2004Inventors: Kazuya Ibaragi, Hideki Kazama, Makoto Oguri
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Patent number: 6660784Abstract: A dental catalyst for chemical polymerization comprising an acidic compound, an organic peroxide such as cumene hydroperoxide, and aryl borate compound such as sodium tetraphenylborate, but without substantially containing amine compound. This catalyst is chemically highly stable, is easy to handle, is highly active, is less likely to be impaired by polymerization, and does not cause the cured product to be tinted or discolored, and is very useful for the dental restorative.Type: GrantFiled: September 21, 2001Date of Patent: December 9, 2003Assignee: Tokuyama CorporationInventors: Kazuya Ibaragi, Hideki Kazama, Makoto Oguri
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Publication number: 20030162863Abstract: A photocurable dental restorative comprising (i) 100 parts by weight of a polymerizable monomer, (ii) 0.Type: ApplicationFiled: March 18, 2002Publication date: August 28, 2003Inventors: Takeshi Satoh, Masataka Himeno, Hideki Kazama