Patents by Inventor Yohji Imai
Yohji Imai 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: 20040157954Abstract: The bone cement composition of the present invention comprises a liquid component including ethyl methacrylate as the main component and a powder component including an ethyl methacrylate/methyl methacrylate copolymer as the main component.Type: ApplicationFiled: February 3, 2004Publication date: August 12, 2004Inventors: Yohji Imai, Yoshinori Kadoma, Kazuo Takakuda, Sadao Morita
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Patent number: 6585514Abstract: To dissolve a calcium hydroxide-based root canal filler having been carbonated and fixed within a root canal, which cannot be removed from the root canal by means of a reamer and a file, during doing the root canal treatment again, and to sterilize the root canal, the solubilizing agent of the carbonated calcium hydroxide-based root canal filler includes water containing 1 to 60% by weight of the whole of at least one acid selected from the group consisting of phosphoric acid, gluconic acid, fumaric acid, lactic acid, glycolic acid, propionic acid, malic acid, maleic acid, citric acid, succinic acid, tartaric acid, acetic acid, glycerophosphoric acid, and malonic acid; and 0.1 to 30% by weight of the whole of at least one sterilizing properties-imparting agent selected from the group consisting of an iodine preparation, a surfactant, a bactericide, hydrogen peroxide, and limonene.Type: GrantFiled: February 15, 2002Date of Patent: July 1, 2003Assignee: GC CorporationInventors: Yohji Imai, Masao Abiru, Kimihiko Sato
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Patent number: 6566418Abstract: A calcium hydroxide-based root canal filling material having superior bioaffinity is provided, which is a temporary root canal filling material to be used in the root canal treatment of teeth, having such roles that, when filled temporarily in the root canal, it stays in an affected part during a predetermined period of time, thereby a root canal being prevented from staining by pathogenic bacteria or exudates, has corrosion resistance, and promotes the remedy of an apical abscess by wound of the root apex portion. The calcium hydroxide-based root canal filling material is comprised of 3 to 20% by weight of polyvinylpyrrolidone and/or polyvinyl methyl ether, 30 to 60% by weight of calcium hydroxide, and 35 to 60% by weight of water. Further, there is an embodiment in which from 5 to 20 parts by weight of at least one X-ray opacity medium selected from barium sulfate, zirconium oxide, bismuth subnitrate, bismuth trioxide, and bismuth carbonate and/or 0.Type: GrantFiled: January 25, 2001Date of Patent: May 20, 2003Assignee: GC CorporationInventors: Yohji Imai, Masao Abiru
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Publication number: 20020198283Abstract: A calcium hydroxide-based root canal filling material having superior bioaffinity is provided, which is a temporary root canal filling material to be used in the root canal treatment of teeth, having such roles that, when filled temporarily in the root canal, it stays in an affected part during a predetermined period of time, thereby a root canal being prevented from staining by pathogenic bacteria or exudates, has corrosion resistance, and promotes the remedy of an apical abscess by wound of the root apex portion. The calcium hydroxide-based root canal filling material is comprised of 3 to 20% by weight of polyvinylpyrrolidone and/or polyvinyl methyl ether, 30 to 60% by weight of calcium hydroxide, and 35 to 60 % by weight of water. Further, there is an embodiment in which from 5 to 20 parts by weight of at least one X-ray opacity medium selected from barium sulfate, zirconium oxide, bismuth subnitrate, bismuth trioxide, and bismuth carbonate and/or 0.Type: ApplicationFiled: January 25, 2001Publication date: December 26, 2002Applicant: GC CORPORATIONInventors: Yohji Imai, Masao Abiru
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Publication number: 20020164558Abstract: To dissolve a calcium hydroxide-based root canal filler having been carbonated and fixed within a root canal, which cannot be removed from the root canal by means of a reamer and a file, during doing the root canal treatment again, and to sterilize the root canal, the solubilizing agent of the carbonated calcium hydroxide-based root canal filler includes water containing 1 to 60% by weight of the whole of at least one acid selected from the group consisting of phosphoric acid, gluconic acid, fumaric acid, lactic acid, glycolic acid, propionic acid, malic acid, maleic acid, citric acid, succinic acid, tartaric acid, acetic acid, glycerophosphoric acid, and malonic acid; and 0.1 to 30% by weight of the whole of at least one sterilizing properties-imparting agent selected from the group consisting of an iodine preparation, a surfactant, a bactericide, hydrogen peroxide, and limonene.Type: ApplicationFiled: February 15, 2002Publication date: November 7, 2002Applicant: GC CorporationInventors: Yohji Imai, Masao Abiru, Kimihiko Sato
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Patent number: 5739231Abstract: A metal surface treatment agent is disclosed, comprising: (a) from 0.001 to 10% by weight of a polymerizable monomer containing a thiophosphoric acid chloride group therein and (b) from 0.001 to 10% by weight of a polymerizable monomer containing a phosphoric acid ester group therein, and optionally, (c) from 0.1 to 5% by weight of a polymerization initiator dissolved in an organic solvent.Type: GrantFiled: April 7, 1995Date of Patent: April 14, 1998Assignee: GC CorporationInventors: Yohji Imai, Yosuke Taira, Tetsuro Sakuma
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Patent number: 5290172Abstract: A method for treating a tooth surface to make it bondable well enough for dental purposes involves treating enamel and dentin with a primer comprising a) an organic acid, b) an iron, copper or cobalt salt and c) water, and then curing the tooth surface with a bonding material comprising d) a methacrylate or acrylate having at least one unsaturated double bond, e) a (thio)barbituric acid derivative and f) a polymerization initiator.Type: GrantFiled: August 31, 1992Date of Patent: March 1, 1994Assignee: GC CorporationInventors: Tetsuro Sakuma, Yohji Imai
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Patent number: 5288341Abstract: An agent is characterized by containing a polymerizable monomer having a thiophosphoric acid dichloride group. By applying this agent to the surfaces of noble metals, much more durable and increased bond strength is obtained.Type: GrantFiled: September 11, 1992Date of Patent: February 22, 1994Assignee: GC CorporationInventors: Katsunori Kojima, Yohji Imai, Tetsuro Sakuma
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Patent number: 5252629Abstract: An adhesive showing a strong bonding effect on dentin characterized by comprising in combination a primer comprising a water-miscible monomer and a salt of copper, iron or cobalt, and a curing composition comprising a methacrylate monomer and a polymerization initiator containing a (thio)barbituric acid derivative as one component.Type: GrantFiled: April 17, 1992Date of Patent: October 12, 1993Assignee: GC CorporationInventors: Yohji Imai, Shigenobu Kusakai
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Patent number: 5234971Abstract: An odontotherapeutical material is based on two liquids A and B containing materials capable of forming difficult-to-dissolve precipitations immediately by mixing. The liquids A and B are successively applied on the affected region.Type: GrantFiled: November 25, 1991Date of Patent: August 10, 1993Assignee: G-C Dental Industrial Corp.Inventors: Yohji Imai, Takahiro Akimoto
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Patent number: 4957437Abstract: An artifical tooth comprises a contacting member formed of a composite material having compatibility with living tissues and diaposed at an outer portion of the artificial tooth to be contacted with alveolar bone, a metal base member having an opening therein and disposed inside of and attached to the contacting member, a metal post inserted into the opening of the metal base member and at least two elastic buffer members disposed in a space between the metal base member and the metal post. The composite material having compatibility with living tissues contains 40 to 95% by weight of a calcium phosphate compound and 60 to 5% by weight of an organic polymer. Each of the elastic buffer members is spaced apart for movably receiving the metal post by which pressure imposed upon the artificial tooth is transmitted.Type: GrantFiled: February 16, 1989Date of Patent: September 18, 1990Assignee: Mitsubishi Mining & Cement Co., Ltd.Inventors: Kaizo Shimura, Hiroyasu Takeuchi, Masahiro Hirano, Yohji Imai