Patents by Inventor Yoshiharu Karasawa

Yoshiharu Karasawa 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).

  • Patent number: 5021294
    Abstract: The present invention is directed to a hydrophilic transparent plastic slide for a microscope and a method for preparing the same. This slide is characterized in that at least one surface of the slide is rendered hydrophilic so that a staining solution which is generally used in microscopic examination may not be repelled thereon. Further, according to the present invention, the plastic slides can be manufactured by providing at least one surface of each slide with a hydrophilic layer of silicon oxide, a polysaccharide or the like.
    Type: Grant
    Filed: September 22, 1987
    Date of Patent: June 4, 1991
    Assignee: Biomate Co., Ltd.
    Inventors: Yoshiharu Karasawa, Ken Hirohashi
  • Patent number: 4547280
    Abstract: In a method for assaying maltose to quantitatively determine amylase, which comprises an enzyme membrane having immobilized .alpha.-glucosidase and glucose oxidase, the present invention is an improvement of the enzyme electrode for assaying maltose, where a hydrogen peroxide electrode provided with a palladium cathode is used.
    Type: Grant
    Filed: November 26, 1984
    Date of Patent: October 15, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Yoshiharu Karasawa, Yoshinori Takata
  • Patent number: 4476005
    Abstract: Urea electrode comprises a urease-immobilized membrane having added amino groups prepared by dipping an immobilized membrane in an aqueous solution of ethylenediamine or polylysine and an electrode for quantitative determination of ammonium ions. The electrode has a shorter measurement time with a larger electrode output.
    Type: Grant
    Filed: September 30, 1983
    Date of Patent: October 9, 1984
    Assignee: Hitachi, Ltd.
    Inventors: Daizo Tokinaga, Teruaki Kobayashi, Akiko Katori, Yoshiharu Karasawa
  • Patent number: 4307195
    Abstract: An immobilized enzyme membrane for use at the working face of an electrochemical electrode is prepared which comprises an asymmetrical membrane integrally formed from a skin layer substantially incapable of permeating an enzyme therethrough but capable of permeating a gas and a liquid, and a sponge layer having pores containing an enzyme immobilized therein by crosslinking and which pores intercommunicate with one another throughout the sponge layer and provide sufficient porosity for retaining a necessary amount of the enzyme. The immobilized enzyme membrane contains a large amount of enzyme, has good diffusion and permeability, and has stabilized enzyme activity for a prolonged period of time. Additionally, there is obtained a quick response time and good analytical precision when the immobilized enzyme membrane is used at the working face of an electrode of electrochemical measuring instruments.
    Type: Grant
    Filed: September 28, 1979
    Date of Patent: December 22, 1981
    Assignee: Hitachi, Ltd.
    Inventors: Yoshiharu Karasawa, Hisashi Kohkame
  • Patent number: 4304818
    Abstract: An insulation system for winding of electric rotating machines having thermal resistance of class H or more and excellent adhesiveness between a conductor and an insulating layer and resistance to thermal stress can be produced by wrapping a plurality of layers of an insulating tape or sheet having thermal resistance of class H or more around a winding conductor, impregnating the thus treated winding conductor with a solventless varnish consisting essentially of 1 equivalent of an epoxy compound containing at least two vicinal epoxy groups, more than one equivalent of an organic polyisocyanate, and then heating the inpregnated winding conductor at a temperature above C. for a time sufficient to form and cure a resin containing as recurring units at least two isocyanurate rings directly bonded to one another through the residue of the polyisocyanate and two oxazolidone rings directly bonded to each other through the residue of the polyepoxide in the presence of 0.
    Type: Grant
    Filed: December 14, 1979
    Date of Patent: December 8, 1981
    Assignee: Hitachi, Ltd.
    Inventors: Hideyo Hirata, Takeshi Hakamada, Misao Souma, Masao Matsui, Yoshiyuki Suda, Yoshiharu Karasawa, Toshikazu Narahara
  • Patent number: 4129554
    Abstract: A thermosettable, polymerizable resin composition comprising a polyepoxide and a polyisocyanate which is normally catalyzed by a basic curing catalyst for forming oxazolidone rings and isocyanurate rings or uredione rings is remarkably stabilized at low temperatures by incorporating a small amount of an organic electron acceptor, such as, picric acid, quinone, chloranil, or cyanoacetate ester into the composition. Since the specific electron acceptors effectively inhibit the polymerization of the reactive components in the composition at low temperatures, a shelf life of the composition is remarkably prolonged.
    Type: Grant
    Filed: May 16, 1977
    Date of Patent: December 12, 1978
    Assignees: Hitachi Chemical Co., Ltd., Hitachi, Ltd.
    Inventors: Yoshiharu Karasawa, Tohru Koyama, Toshikazu Narahara
  • Patent number: 4128531
    Abstract: A thermosetting resin composition comprising a polyfunctional epoxy compound such as diglycidyl ether of bisphenol A, a polyfunctional isocyanate such as diphenylmethane diisocyanate, a curing agent and polybutadiene type polymer having terminal hydroxyl groups can produce cured articles excellent in heat resistance and crack resistance.
    Type: Grant
    Filed: October 18, 1977
    Date of Patent: December 5, 1978
    Assignee: Hitachi Chemical Company, Ltd.
    Inventors: Shinichi Toyoda, Masahiko Sakai, Kazuo Goto, Toshikazu Narahara, Yoshiharu Karasawa
  • Patent number: 4070416
    Abstract: A novel thermosetting resin can be obtained by mixing 1 equivalent or more of a polyfunctional isocyanate per 1 equivalent of a polyfunctional epoxide and then carrying out a polymerization reaction of the mixture in the presence of the catalyst which forms isocyanurate rings and oxazolidone rings so as to enable the mixture to form 2 or more isocyanurate rings directly connected with oxazolidone rings through an isocyanate residues.The resulting thermosetting resin has excellent electrical, chemical and impact resistances and excellent self-extinguishing properties. Said resin is used as an electric insulating material.
    Type: Grant
    Filed: August 18, 1975
    Date of Patent: January 24, 1978
    Assignee: Hitachi, Ltd.
    Inventors: Toshikazu Narahara, Katuo Sugawara, Yoshiharu Karasawa, Hitoshi Yokono, Junji Mukai, Tadashi Muroi