Patents by Inventor Akio Iwama
Akio Iwama 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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Patent number: 7431985Abstract: A medical pressure-sensitive adhesive composition having excellent re-adhesion property, and also excellence in both the peel adhesion property and the low skin stimulus property, a process for producing the same, and a medical tape are provided.Type: GrantFiled: August 30, 2006Date of Patent: October 7, 2008Assignees: Lintec Corporation, PIAC Co., Ltd.Inventor: Akio Iwama
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Publication number: 20060292365Abstract: A medical pressure-sensitive adhesive composition having excellent re-adhesion property, and also excellence in both the peel adhesion property and the low skin stimulus property, a process for producing the same, and a medical tape are provided.Type: ApplicationFiled: August 30, 2006Publication date: December 28, 2006Inventor: Akio Iwama
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Publication number: 20050080195Abstract: A medical pressure-sensitive adhesive composition having excellent re-adhesion property, and also excellence in both the peel adhesion property and the low skin stimulus property, a process for producing the same, and a medical tape are provided.Type: ApplicationFiled: December 26, 2002Publication date: April 14, 2005Inventor: Akio Iwama
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Patent number: 6203900Abstract: A pressure sensitive adhesive sheet for the detection of microorganisms, which comprises a laminate of an adhesive layer mainly composed of a water-soluble polymer and a water-permeable membrane which does not allow passage of the microorganisms; a pressure sensitive adhesive sheet for the detection of microorganisms, wherein the surface of the adhesive layer has a contact angle with water of not more than 90°; and a method for detecting a microorganism, which comprises bringing the surface of an adhesive layer of a pressure sensitive adhesive sheet into contact with the surface of a test object, and then bringing the surface of the adhesive layer into contact with water, said adhesive layer or water containing a chromogenic reagent. The use of the laminate makes it possible to leave only stained microorganisms on the water-permeable membrane and to precisely observe the color developed by the microorganisms.Type: GrantFiled: June 30, 1997Date of Patent: March 20, 2001Assignee: Nitto Denko CorporationInventors: Takeshi Saika, Shuji Senda, Yoshitaka Kazuse, Akio Iwama, Tetsuji Sugii, Masao Nasu, Katsuji Tani, Nobuyasu Yamaguchi
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Patent number: 5078755Abstract: This invention relates to a method of removing dissolved gas from liquid, which comprises bringing the liquid containing the gas dissolved therein into contact with a membrane, thereby causing the dissolved gas to selectively permeate the membrane. The membrane is a permselective, composite membrane composed of a porous support and a nonporous, active membrane of a synthetic resin formed on the porous support, or is a permeable membrane having such characteristics that the nitrogen gas permeation rate at 30.degree. C. is in the range from 7.times.10.sup.-4 to 2.times.10.sup.2 Nm.sup.3 m.sup.2 .multidot.h.multidot.atom and that the amount of permeated steam is 100 g/m.sup.2 .multidot.h or less when 20.degree. C. water is supplied to the membrane under atmospheric pressure while maintaining the pressure on its permeate side at 40 mmHg.Type: GrantFiled: January 10, 1991Date of Patent: January 7, 1992Assignee: Nitto Denko CorporationInventors: Osami Tozawa, Takeshi Sasaki, Akira Shimazu, Akio Iwama
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Patent number: 4964887Abstract: A process for separating methane from a gaseous mixture containing methane and carbon dioxide by concentration is disclosed, which comprises contacting said gaseous mixture with a membrane comprising a film of a polyimide resin having a repeating unit represented by formula (I): ##STR1## wherein R.sup.1 represents a divalent aromatic, alicyclic or aliphatic hydrocarbon group, or a divalent organic group composed of these hydrocarbon groups linked via a divalent organic linking group. The membrane exhibits excellent selective permeability to carbon dioxide, enabling efficient and stable separation of methane.Type: GrantFiled: November 14, 1988Date of Patent: October 23, 1990Assignee: Nitto Denko CorporationInventors: Shunichi Shimatani, Michiharu Yamamoto, Akira Shimazu, Akio Iwama
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Patent number: 4787981Abstract: A process for purification of crude glyceride oil compositions which comprises diluting a crude glyceride oil composition containing gum material and wax as main components of impurities with an organic solvent, bringing the diluted crude glyceride oil composition into contact with a semipermeable membrane composed of polyimide consisting essentially of a repeating unit represented by the general formula: ##STR1## wherein R.sup.1 represents a divalent organic group, under pressure to obtain a semipermeable membrane permeable liquid in which the gum material in the glyceride oil after removal of said organic solvent is 100 ppm or less, carrying out bleaching of the glyceride oil obtained from said semipermeable membrane permeable liquid with at least one kind of an adsorbent selected from the group consisting of clay, activated clay, activated carbon and bone black, and then carrying out deodorizing to obtain a purified glyceride oil.Type: GrantFiled: November 10, 1986Date of Patent: November 29, 1988Assignees: Pinoru Oil Mills Co., Nitto Electric Industrial Co., Ltd.Inventors: Seiichi Tanahashi, Kaoru Nagano, Masaaki Kasai, Fujihiko Tsubone, Akio Iwama, Yoshitaka Kazuse, Kentaro Tasaka, Yutaka Isooka
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Patent number: 4618534Abstract: A composite membrane and a process for producing the same are described. This composite membrane comprises a polyimide resin anisotropic membrane and a cross-linked silicone resin thin film formed on the anisotropic membrane, the anisotropic membrane comprising a dense surface layer and a porous layer continuously connected thereto and the polyimide resin consisting essentially of a repeating unit of the formula: ##STR1## wherein A and R.sup.1 are the same as defined hereinbefore. This composite membrane is useful for separation of organic solutions containing relatively small solutes of molecular weight of the order of 10 to 1,000 liquid/liquid separation, and concentration and separation of gases.Type: GrantFiled: October 23, 1984Date of Patent: October 21, 1986Assignee: Nitto Electric Industrial Co., Ltd.Inventors: Akio Iwama, Kentaro Tasaka, Yoshitaka Kazuse
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Patent number: 4590098Abstract: A process for producing a composite membrane is disclosed. The composite membrane is produced by bringing an organic solution of a specific cross-linkable silicone resin into contact with the surface of a dense layer of an anisotropic membrane made of a polyimide resin. The composite membrane is useful for separation of an organic solution containing a relatively small solute, liquid/liquid separation by pervaporation method, and concentration and separation of gases.Type: GrantFiled: October 23, 1984Date of Patent: May 20, 1986Assignee: Nitto Electric Industrial Co., Ltd.Inventors: Yoshitaka Kazuse, Akio Iwama, Shinichi Chikura
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Patent number: 4529793Abstract: A selective permeable membrane comprising a polyquinazolone-based polymer including a repeating unit represented by the formula ##STR1## wherein R.sup.1 is a tetravalent aromatic group, R.sup.2a and R.sup.2b are each independently, an alkyl group or aromatic group, and R.sup.3 is a divalent organic group.Type: GrantFiled: June 20, 1983Date of Patent: July 16, 1985Assignee: Nitto Electric Industrial Co., Ltd.Inventors: Masao Abe, Akio Iwama, Yuzuru Noda, Hisashi Ichinose
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Patent number: 4414157Abstract: A process for the purification of crude glyceride oil compositions which comprises bringing a miscella of a crude glyceride oil composition containing therein a glyceride oil and phospholipid into contact with a capillary semipermeable membrane to concentrate the miscella to a predetermined level, and thereafter bringing the preliminarily concentrated miscella into contact with a tubular semipermeable membrane to concentrate the miscella to a higher level.Type: GrantFiled: December 30, 1981Date of Patent: November 8, 1983Assignee: Nitto Electric Industrial Co., Ltd.Inventors: Akio Iwama, Yoshitaka Kazuse
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Patent number: 4410568Abstract: A process for preparing a selective permeable membrane having self-supporting property, which comprises coating on a supporting substrate a dope comprising a polyimide polymer consisting essentially of a repeating unit of the formula: ##STR1## wherein R is a divalent organic group, an inorganic salt and an organic solvent, as a dope solvent, which dissolves a mixture of the polymer and the inorganic salt to form a homogeneous system, to prepare a dope coated supporting substrate, heat treating the substrate at a temperature which does not cause the organic solvent in the dope to boil, and then coagulating the substrate.Type: GrantFiled: October 8, 1980Date of Patent: October 18, 1983Assignee: Nitto Electric Industrial Co., Ltd.Inventors: Akio Iwama, Yasuo Kihara, Masao Abe, Yoshitaka Kazuse
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Patent number: 4385084Abstract: A process is described for preparing a selective permeable membrane comprising coating a solution consisting essentially of(i) a polyimide polymer consisting essentially of a repeating unit of the formula (I): ##STR1## wherein R.sup.1 is a divalent organic group, (ii) a swelling agent selected from the group of compounds represented by formula (II) and (III):R.sup.3 O----CH.sub.2 CHR.sup.2 O).sub.n R.sup.4 (II)R.sup.5 ----OH).sub.m (III)wherein R.sup.2, R.sup.3 and R.sup.4, which may be the same or different, can be hydrogen, a methyl group, or an ethyl group, and when R.sup.2 is hydrogen, n can be an integer of from 1 to 5, and when R.sup.2 is a methyl or ethyl group, n can be an integer of from 1 to 3, R.sup.Type: GrantFiled: May 19, 1980Date of Patent: May 24, 1983Assignee: Nitto Electric Industrial Co., Ltd.Inventors: Akio Iwama, Yoshiyasu Kamiyama, Yoshitaka Kazuse, Hisashi Ichinose
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Patent number: 4358378Abstract: A selective permeable membrane and a process for preparing the membrane. The process comprises applying to a supporting substrate a membrane forming solution prepared by dissolving in an organic solvent a polyimide polymer comprising principally a repeating unit represented by the general formula (I): ##STR1## wherein R.sup.1 represents a divalent organic group, and a liquid swelling agent having a coagulation value with respect to the polyimide polymer of about 50 to about 200 and a boiling point of about 50.degree. C. to about 120.degree. C. under atmospheric pressure, evaporating at least a part of the swelling agent, and coagulating the polyimide polymer by contacting the polyimide polymer with a coagulating solvent which does not dissolve the polyimide polymer but is compatible with the organic solvent and the swelling agent.Type: GrantFiled: March 31, 1981Date of Patent: November 9, 1982Assignee: Nitto Electric Industrial Co., Ltd.Inventors: Akio Iwama, Hiroshi Iwahori, Yoshitaka Kazuse
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Patent number: 4240914Abstract: A selective permeable membrane having self-supporting property which comprises a polyimide polymer consisting essentially of a repeating unit of the formula: ##STR1## wherein R is a divalent organic group, and a process for preparing the same.Type: GrantFiled: November 16, 1978Date of Patent: December 23, 1980Assignee: Nitto Electric Industrial Co., Ltd.Inventors: Akio Iwama, Yasuo Kihara, Masao Abe
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Patent number: 4102807Abstract: A hydrous gel consisting essentially of a heat-moldable w/o emulsion comprising about 15 to about 95% by weight of a continuous phase of an A-B-A type teleblock copolymeric elastomer and an oil component and about 85 to about 5% by weight of an emulsified dispersed water phase. The hydrous gel is prepared by dissolving the teleblock copolymeric elastomer in an excess of the oil component by heating, adding an emulsifier and water to the solution to disperse the water therein and to form the w/o emulsion, and then cooling the resulting emulsion to room temperature. The hydrous gel finds a wide range of utility, for example, as an insulator, especially to maintain low or high temperature environments, as a fireproofing material, as a heat absorbant, and as a hospital mat.Type: GrantFiled: April 23, 1976Date of Patent: July 25, 1978Assignee: Nitto Electric Industrial Co., Ltd.Inventors: Akio Iwama, Isao Mune