Patents by Inventor Masahiko Sakai

Masahiko Sakai 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: 5350789
    Abstract: A hot-melt ink composition for an ink jet printer comprising from 10 to 65% by weight of a polyamide resin, from 5 to 60% by weight of a fatty acid amide, from 5 to 40% by weight of a glyceride, and up to 5% by weight of a colorant. The composition is excellent in transparency to provide a highly transparent ink image on an OHP sheet.
    Type: Grant
    Filed: January 22, 1993
    Date of Patent: September 27, 1994
    Assignees: Hitachi Koki Co., Ltd., Hitachi, Ltd.
    Inventors: Akemi Sagawa, Ren Itoh, Masahiko Sakai, Riyuuichi Shimizu
  • Patent number: 5316227
    Abstract: An apparatus for forming a field coil with a low load comprises a rotary table, a reel table to be turned together with the rotary table, six reel bars for guiding and winding a conductor into the coil according to the rotation of the rotary table, and six shaping units disposed alternately with the reel bars. The shaping units are radially movable on the rotary table. A groove-cam-type moving mechanism radially reciprocates, at a rate of one reciprocation per turn of the rotary table, the shaping units on the rotary table with predetermined phase shifts between the movements of the shaping units, thereby pushing the conductor stretched between the reel bars toward the center of the rotary table and shaping the conductor.
    Type: Grant
    Filed: August 27, 1991
    Date of Patent: May 31, 1994
    Assignee: Nippondenso Co., Ltd.
    Inventors: Yasushi Oohashi, Mithuyuki Hayashi, Masahiko Sakai
  • Patent number: 5174013
    Abstract: A winding apparatus for winding a coated wire on the drum for making a coil which is used for a stator or an alternator. A sectional shape of the wire which is introduced to the winding apparatus is circular, and the wire is deformed in order to make the sectional shape of the wire polygonal, so that the polygonal wire is fed to the bobbin in order to be wound on the bobbin. The resulting coil wound by the apparatus has an increased density.
    Type: Grant
    Filed: April 17, 1991
    Date of Patent: December 29, 1992
    Assignee: Nippondenso Co., Ltd.
    Inventors: Masayuki Hiroshima, Masahiko Sakai
  • Patent number: 5109690
    Abstract: A tension apparatus for imposing a predetermined tension on a wire-like member which is used for a stator or a alternator. First and second rollers are rotatably supported on a supporting means in such a manner that a space between the first roller and the second roller is smaller than a diameter of the wire-like member. When the wire-like member is passed through a space between a first roller and a second roller, the wire-like member is deformed, and after all, a predetermined tension is imposed on the wire-like member. The tension of the wire-like member can be changed in accordance with the space between the first roller and the second roller.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: May 5, 1992
    Assignee: Nippondenso Co., Ltd.
    Inventors: Toshihisa Taniguchi, Mituyuki Hayashi, Masahiko Sakai
  • Patent number: 5045869
    Abstract: Printing is performed with the higher one of the two resolutions designated for text data and image data if these resolutions are different from each other. If in this case the resolution designated for the text data is changed, character patterns based the an optimum number of constituent dots are selected for printing of characters of the designated size in accordance with the text data. If the resolution of the image data is changed, the image data is interpolated.
    Type: Grant
    Filed: September 14, 1989
    Date of Patent: September 3, 1991
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yukio Isaka, Tetsuya Morita, Hiroshi Yamano, Masahiko Murata, Masahiko Sakai
  • Patent number: 4988055
    Abstract: A coil assembly including a coil of material having a square or hexagonal cross section wound on a bobbin. On the coil winding surface are a plurality of first mutually parallel grooves which have a V-notch cross section and are so arranged that the centers of adjacent grooves are separated from each other by a distance of about P which is the width of said grooves. The coil winding surface also has a plurality of second mutually parallel grooves which have a V-notch cross section and are so arranged that the centers of adjacent grooves are also separated from each other by the distance P. Each of the first grooves is off-set from the corresponding second groove in the axial direction by the distance of about P/2 or less. A pair of intermediate sections with oblique grooves having a predetermined length in the circumferential direction are provided between the respective ends of the first and second grooves.
    Type: Grant
    Filed: May 11, 1989
    Date of Patent: January 29, 1991
    Assignee: Nippondenso Co., Ltd.
    Inventors: Masahiko Sakai, Mithuyuki Hayashi, Toshihisa Taniguchi
  • Patent number: 4937048
    Abstract: A carrier transporting apparatus for use in an automatic chemical analyzer for measuring given substances in samples in accordance with an enzyme-immuno-assay includes a carrier supply device for supplying the predetermined number of carriers from a carrier container into successive reaction vessels and a carrier discharge device for discharging the carriers from the reaction vessels, in a simple and accurate manner. Moreover, the carrier container from which the carriers can be put out one by one in an accurate manner is also disclosed.
    Type: Grant
    Filed: January 30, 1984
    Date of Patent: June 26, 1990
    Assignee: Olympus Optical Company Limited
    Inventors: Masahiko Sakai, Hiroshi Takekawa, Takashi Yamada, Shirou Ishiwatari
  • Patent number: 4767394
    Abstract: A method and apparatus for making axial-flow filters wherein a sectorial-shaped sheet of filter material having corrugations therein parallel to the curved ends thereof is made from a flat sheet of filter material, and thereafter the corrugated sheet is made into an annulus to obtain the final product. Initially, an edge portion of a flat sheet of filter material is attached to a sectorial-shaped mold, having a mold surface defined by curved ridges and valleys parallel to the curved ends of the mold, so that the sheet is slanted up away from the mold surface from the smaller curved end of the mold. Thereafter a set of curved forming blades is moved down toward the mold to engage the sheet and to fold it successively and consecutively across the ridges of the mold and beneath the edges of the blades into the valleys of the mold to corrugate the sheet.
    Type: Grant
    Filed: February 6, 1987
    Date of Patent: August 30, 1988
    Assignee: Nippondenso Co., Ltd.
    Inventors: Yuuji Ito, Tadahiko Shibata, Masahiko Sakai, Harukazu Matuyama
  • Patent number: 4659323
    Abstract: A method and apparatus for making axial-flow filters wherein a sectorial-shaped sheet of filter material having corrugations therein parallel to the curved ends thereof is made from a flat sheet of filter material in the first step, and thereafter the corrugated sheet is made into an annulus to obtain the final product. In the first step, an edge portion of a flat sheet of filter material is attached to a sectorial-shaped mold, having a mold surface defined by curved ridges and valleys parallel to the curved ends of the mold, so that the sheet is slanted up away from the mold surface from the smaller curved end of the mold. Thereafter a set of curved forming blades is moved down toward the mold to engage the sheet and to fold it successively and consecutively across the ridges of the mold and beneath the edges of the blades into the valleys of the mold to corrugate the sheet.
    Type: Grant
    Filed: January 11, 1985
    Date of Patent: April 21, 1987
    Assignee: Nippondenso Co., Ltd.
    Inventors: Yuuji Ito, Tadahiko Shibata, Masahiko Sakai, Yukio Ota, Naohiko Kondo, Harukazu Matuyama
  • Patent number: 4269894
    Abstract: Electric windings comprising an electric conductor and a plurality of cured insulating layers wrapping around the conductor, said cured insulating layers being obtained by bonding two or more insulating materials with a binder solution containing a mixture of a condensation polymerization type silicone resin containing hydroxyl groups in the molecule and an addition polymerization type silicone resin to form a composite insulating material, wrapping the composite insulating material around the conductor, impregnating the wrapped composite insulating material with an impregnating varnish of an epoxy-isocyanate resin and curing the impregnated composite insulating material, have excellent water resistance in addition to excellent thermal resistance, and mechanical properties.
    Type: Grant
    Filed: December 3, 1979
    Date of Patent: May 26, 1981
    Assignee: Hitachi, Ltd.
    Inventors: Masahiko Sakai, Shinichi Toyoda, Toshikazu Narahara, Takeshi Hakamada, Tomoya Tsunoda
  • Patent number: 4222802
    Abstract: Electric machine windings produced by wrapping a composite insulating material around an electrical conductor, said composite insulating material having been prepared by bonding two or more insulating materials with a silicone resin containing hydroxyl groups in the molecular structure, impregnating said composite insulating material with an insulating varnish comprising 1 equivalent of a polyfunctional epoxy compound and 2.5 to 25 equivalents of a polyfunctional isocyanate compound and curing said varnish, have excellent insulation properties under high temperatures and high humidity and thermal resistance of class H or more.
    Type: Grant
    Filed: May 14, 1979
    Date of Patent: September 16, 1980
    Assignee: Hitachi, Ltd.
    Inventors: Masahiko Sakai, Toshikazu Narahara, Toru Koyama, Shinichi Toyoda, Kazuo Goto
  • Patent number: 4130546
    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 a polybutadiene type homopolymer having terminal hydroxyl groups or copolymer having terminal amino groups, or a reaction product of a polyfunctional epoxy compound or an epoxy compound having halogen atom(s) and a polybutadiene type homopolymer or copolymer having terminal hydroxyl groups or terminal carboxyl groups can produce cured articles excellent in heat resistance, crack resistance and fire resistance.
    Type: Grant
    Filed: October 18, 1977
    Date of Patent: December 19, 1978
    Assignee: Hitachi Chemical Company, Ltd.
    Inventors: Kazuo Goto, Shinichi Toyoda, Masahiko Sakai
  • 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: 4026872
    Abstract: In an epoxy resin composition comprising an alicyclic epoxy resin, a curing agent having phenolic hydroxyl group in its molecule and an imidazole curing accelerator, excellent thermal resistance and excellent mechanical properties can be given to the cured epoxy resin composition by blending 100 parts by weight of 2-(3,4-epoxy)cyclohexyl-5,5-spiro(3,4-epoxy)cyclohexane-m-dioxane as the alicyclic epoxy resin, 25 to 50 parts by weight of a phenol-formaldehyde condensate as the curing agent having phenolic hydroxyl group in its molecule and 0.
    Type: Grant
    Filed: May 11, 1976
    Date of Patent: May 31, 1977
    Assignee: Hitachi, Ltd.
    Inventors: Kenichi Saida, Masahiko Sakai, Toshikazu Narahara
  • Patent number: 3984376
    Abstract: Thermosetting resin compositions are obtained by mixing a resinous addition product produced by reacting an isocyanate compound having a molecular weight of 100 to 2000 and containing at least two isocyanate groups in its molecule with an epoxyphenol compound represented by the formula, ##EQU1## wherein R is a bi- or more valent group containing phenyl, R.sub.1 is hydrogen, methyl or ethyl, m and n each are an integer of 1-8, and optionally an ordinary thermosetting epoxy resin, and 0.01 to 10 % by weight of a basic heterocycle forming catalyst based on the weight of said resinous addition product, said isocyanate compound and said epoxyphenol compound being blended so that said OH group may be present in an amount of 1/3 to 1 equivalent per equivalent of said isocyanate group and said epoxy group may be present in an amount of one-fifth to two-thirds equivalent per equivalent of said isocyanate group.
    Type: Grant
    Filed: June 25, 1974
    Date of Patent: October 5, 1976
    Assignee: Hitachi, Ltd.
    Inventors: Hitoshi Yokono, Shunichi Numata, Kazuo Goto, Masahiko Sakai, Toshikazu Narahara, Junji Mukai