Patents by Inventor Naoyuki Fukahori

Naoyuki Fukahori 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: 5127079
    Abstract: An endoscope comprising as an image-transmitting member a multifilament type plastic optical fiber in which 50 to 20,000 islands having a core-sheath structure, a core diameter of 2 to 70 .mu.m and a circular or substantially circular section are arranged in a zigzag-stacked or square-stacked structure in the sea having a circular or substantially circular section, so that the lamination structure of the entire cores has a substantially circular shape in the section of the image-transmitting portion, wherein the same positional relationship of the ends of light-transmitting paths arranged in the section of the optical fiber is maintained on both the ends of the optical fiber, the periphery of the section of the image-transmitting portion of the optical fiber has a circular or substantially circular shape, and an object lens is attached to one end of the image-transmitting member and an image-transmitting light-receiving member is arranged on the other end of the image-transmitting member.
    Type: Grant
    Filed: February 22, 1991
    Date of Patent: June 30, 1992
    Assignee: Mitsubishi Rayon Company Ltd.
    Inventors: Fumio Suzuki, Masashi Okamoto, Toshinori Sumi, Naoyuki Fukahori
  • Patent number: 5077820
    Abstract: An optical fiber photoconductor, comprising at least two multi-filament plastic optical fiber units arranged in parallel and having a substantially rectangular peripheral shape and at least one end fixed in a cap, each optical fiber unit having 50 to 10000 core-sheath light-transmitting islands having a diameter of 5 to 200.mu., which are densely arranged in a sea portion, wherein in each of the multi-filament plastic optical fiber units having a rectangular sectional shape, the end face fixed in the cap is expanded so that the length of one side of the end face is at least 1.01 times the original length of one side of the rectangular peripheral shape of the multi-filament plastic optical fiber unit, whereby a bonding interface between the multi-filament plastic optical fiber units substantially disappears.
    Type: Grant
    Filed: August 17, 1990
    Date of Patent: December 31, 1991
    Assignee: Mitsubishi Rayon Company, Ltd.
    Inventors: Syuichiro Tokuda, Hidenori Osawa, Naohiro Yamamoto, Naoyuki Fukahori
  • Patent number: 5039457
    Abstract: A multifilament type plastic optical fiber having a substantially rectangular cross-section and an islands-in-the-sea structure in which 100 to 10,000 islands are arranged in the sea, wherein the respective islands have a substantially circular cross-section and a core-sheath structure, the islands are arranged in a zigzag-stacked structure, the core occupaney ratio in the multifilament type optical fiber cores section is at least 50% and the brightness index value I which is defined by the following (1), is at least 4.5.times.10.sup.-2 : ##EQU1## wherein S stands for the core occupancy ratio in the multifilament type optical fiber, .alpha. stands for the transmission loss (dB/m) per meter of the multifilament type optical fiber, NA stands for the numeral apertures, and L stands for the length (m) of the used optical fiber.
    Type: Grant
    Filed: March 8, 1989
    Date of Patent: August 13, 1991
    Assignee: Mitsubishi Rayon Company Ltd.
    Inventors: Hiromu Terada, Kenichi Sakunaga, Naoyuki Fukahori
  • Patent number: 4872740
    Abstract: An endoscope comprising as an image-transmitting member a multifilament type plastic optical fiber, an object lens arranged on one end of the optical fiber and a device for guiding an image of an object transmitted to the other end of the optical fiber to an image-receiving portion, wherein the multifilament type plastic optical fiber has an islands-in-sea structure in which 50 to 10,000 light-transmitting core-sheath structure islands having a diameter of 5 to 200 .mu. are arranged in the sea so that the same positional relationship of the islands is maintained on both ends of the optical fiber, and the core occupancy ratio in the total cross-section of the optical fiber is at least 50%.
    Type: Grant
    Filed: February 5, 1988
    Date of Patent: October 10, 1989
    Assignee: Mitsubishi Rayon Company, Ltd.
    Inventors: Hiromu Terada, Naoyuki Fukahori, Kenichi Sakunaga
  • Patent number: 4842365
    Abstract: A multifilament type plastic optical fiber having a substantially rectangular cross-section and an islands-in-the-sea structure in which 100 to 10,000 islands are arranged in the sea, wherein the respective islands have a substantially circular cross-section and a core-sheath structure, the islands are arranged in a sigzag-stacked structure, the core occupancy ratio in the multifilament type optical fiber cores section is at least 50% and the brightness index value I which is defined by the following (1), is at least 4.5.times.10.sup.-2 :I=S.multidot.NA.sup.2 .multidot.10.sup.-(.alpha.L/10) (1)wherein S stands for the core occupancy ratio in the multifilament type optical fiber, .alpha. stands for the transmission loss (db/m) per meter of the multifilament type optical fiber, NA stands for the numeral apertures, and L stands for the length (m) of the used optical fiber.
    Type: Grant
    Filed: June 15, 1987
    Date of Patent: June 27, 1989
    Assignee: Mitsubishi Rayon Company Ltd.
    Inventors: Hiromu Terada, Kenichi Sakunaga, Naoyuki Fukahori
  • Patent number: 4812012
    Abstract: An optical fiber array comprising a great number of multifilament type plastic optical fibers having a substantially rectangular peripheral sectional shape and including 10 to 10000 light-transmitting islands having a diameter of 5 to 200 .mu.m, which are densely arranged in the sea, wherein one ends of the multifilament type plastic optical fibers are arranged in one line or a plurality of lines and the other ends thereof are integrated in a substantially rectangular or substantially circular shape.
    Type: Grant
    Filed: December 2, 1987
    Date of Patent: March 14, 1989
    Assignee: Mitsubishi Rayon Company Ltd.
    Inventors: Hiromu Terada, Kenichi Sakunaga, Naoyuki Fukahori
  • Patent number: 4768857
    Abstract: A multifilament type plastic optical fiber having a substantially uniform cross-section and an islands-in-sea structure, in which 10 to 10,000 islands are arranged in the sea, the respective islands have a substantially uniform cross-section having a diameter of 10 to 200.mu.
    Type: Grant
    Filed: September 22, 1987
    Date of Patent: September 6, 1988
    Assignee: Mitsubishi Rayon Company Ltd.
    Inventors: Kenichi Sakunaga, Hiromu Terada, Yoshiro Nieda, Naoyuki Fukahori
  • Patent number: 4742472
    Abstract: This invention provides a method and an apparatus for controlling a polymerization reaction. The temperature difference between a target temperature, calculated from the degradation rate of a polymerization initiator, which varies as a function of temperature, and a polymerization reactor temperature is calculated. The difference in polymerization rate between a target polymerization rate previously set and a polymerization rate calculated from a measured heat release value at a certain time in the polymerization process is calculated. The temperature inside the reactor is finely adjusted on the basis of the temperature difference and the difference in polymerization rate.
    Type: Grant
    Filed: April 22, 1985
    Date of Patent: May 3, 1988
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Teruhiko Sugimori, Fumio Suzuki, Naoyuki Fukahori
  • Patent number: 4609540
    Abstract: A process for producing a carbon fiber having a tenacity of 450 kg/mm.sup.2 or more, preferably 500 kg/mm.sup.2 or more, and a modulus of elasticity of 25 ton/mm.sup.2 or more which comprises subjecting a polyacrylonitrile-type fiber to a flame-resisting treatment in a flame-resisting treatment furnace provided with a plural number of driving rolls in an oxidizing atmosphere at 200.degree. to 400.degree. C. under application of multistep elongation, during said treatment the respective percentage of elongation in said multistep elongation being set respectively at a value which is equal to or within .+-.3% of the value of the percentage of elongation En indicating an inflection point Pn obtainable from the load and the percentage of elongation determined in advance by experimental measurements, and then subjecting the treated fiber to carbonization.
    Type: Grant
    Filed: May 14, 1985
    Date of Patent: September 2, 1986
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Jinko Izumi, Yoshitaka Imai, Munetsugu Nakatani, Yoshiteru Tanuku, Naoyuki Fukahori
  • Patent number: 4245059
    Abstract: An unsaturated polyester composition for molding compounds, consisting essentially of (1) 20 to 70 parts by weight of an unsaturated polyester obtained by condensing an acid component comprising a major amount of an .alpha.,.beta.-ethylenically unsaturated dicarboxylic acid with a polyol, (2) 25 to 75 parts by weight of a vinyl monomer copolymerizable with said unsaturated polyester, (3) 1 to 25 parts by weight of a thermoplastic polymer, and (4) at least one member selected from the group consisting of hydroxyl-containing vinyl monomers and epoxy-containing vinyl monomers in a ratio of 1 to 40 parts by weight to 100 parts by weight of said unsaturated polyester (to form 100 parts by weight of the composition). The composition may be molded and cured to yield articles which provide good adhesion to surface coatings and are susceptible of decorative finishes.
    Type: Grant
    Filed: October 31, 1978
    Date of Patent: January 13, 1981
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Yutaka Ichimura, Takahiro Kishino, Naoyuki Fukahori
  • Patent number: 3997627
    Abstract: An unsaturated polyester composition for molding compounds, consisting essentially of (1) 20 to 70 parts by weight of an unsaturated polyester obtained by condensing an acid component comprising a major amount of an .alpha.,.beta.-ethylenically unsaturated dicarboxylic acid with a polyol, (2) 25 to 75 parts by weight of a vinyl monomer copolymerizable with said unsaturated polyester, (3) 1 to 25 parts by weight of a thermoplastic polymer, and (4) at least one member selected from the group consisting of hydroxyl-containing vinyl monomers and epoxy-containing vinyl monomers in a ratio of 1 to 40 parts by weight to 100 parts by weight of said unsaturated polyester (to form 100 parts by weight of the composition). The composition may be molded and cured to yield articles which provide good adhesion to surface coatings and are sesceptible of decorative finishes.
    Type: Grant
    Filed: August 27, 1974
    Date of Patent: December 14, 1976
    Assignee: Mitsubishi Rayon Co., Ltd.
    Inventors: Yutaka Ichimura, Takahiro Kishino, Naoyuki Fukahori