Patents by Inventor Ken Katagiri

Ken Katagiri 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).

  • Publication number: 20190319431
    Abstract: An embodiment of the present invention provides a laser module having a longer average device life as compared to a conventional laser module. A laser module (1) includes: a plurality of laser diodes (LD1 to LD6) emitting laser beams; and an optical fiber (OF), the laser beams being caused to enter the optical fiber (OF), the laser diodes (LD1 to LD6) being arranged such that among light beams constituting return light emitted from the optical fiber (OF), a paraxial beam does not meet active layers of the laser diodes (LDi) at respective exit end surfaces of the laser diodes (LDi), the paraxial beam having been emitted from the optical fiber (OF) at an emission angle ? of not more than ?1 which is given by the following Formula (A): [ Math . ? 1 ] ? ? 1 = Arcsin ? ( NA ) 3 ? 2 ? ln ? ? 2 , ( A ) where NA is a numerical aperture of the optical fiber.
    Type: Application
    Filed: November 16, 2017
    Publication date: October 17, 2019
    Applicant: FUJIKURA LTD.
    Inventor: Ken Katagiri
  • Patent number: 10073220
    Abstract: Provided is an optical coupler configured to cause an NA of light, which exits a taper fiber, to be smaller as compared with a conventional optical coupler. A taper fiber has a high refractive index part which is provided inside a core of the taper fiber and which has a refractive index smaller than a refractive index ncore of the core. An exit end surface of each GI fiber is bonded to an entrance end surface of the taper fiber so that at least a part of the exit end surface of the each GI fiber overlaps with a section of the high refractive index part. A relative refractive index difference of the taper fiber is smaller than 0.076%.
    Type: Grant
    Filed: March 6, 2017
    Date of Patent: September 11, 2018
    Assignee: FUJIKURA LTD.
    Inventors: Tomoyuki Fujita, Kentaro Ichii, Ken Katagiri, Kenichi Ohmori, Rintaro Kitahara, Tatsuya Kishi
  • Publication number: 20170235055
    Abstract: Provided is an optical coupler configured to cause an NA of light, which exits a taper fiber, to be smaller as compared with a conventional optical coupler. A taper fiber has a high refractive index part which is provided inside a core of the taper fiber and which has a refractive index smaller than a refractive index ncore of the core. An exit end surface of each GI fiber is bonded to an entrance end surface of the taper fiber so that at least a part of the exit end surface of the each GI fiber overlaps with a section of the high refractive index part. A relative refractive index difference of the taper fiber is smaller than 0.076%.
    Type: Application
    Filed: March 6, 2017
    Publication date: August 17, 2017
    Applicant: FUJIKURA LTD.
    Inventors: Tomoyuki Fujita, Kentaro Ichii, Ken Katagiri, Kenichi Ohmori, Rintaro Kitahara, Tatsuya Kishi
  • Publication number: 20170170628
    Abstract: A semiconductor laser apparatus includes: a semiconductor laser device that emits laser beam in a first direction; a collimator lens that collimates a component in a second direction perpendicular to the first direction among components of laser beam emitted from the semiconductor laser device; and a lens fixing block having a lens mounting surface perpendicular to a third direction perpendicular to the first and second directions. A first end portion of the collimator lens in the third direction is fixed to the lens mounting surface of the lens fixing block by a fixing resin, and a fillet is formed on each of two crossing surfaces in the first end portion fixed by the fixing resin.
    Type: Application
    Filed: February 27, 2017
    Publication date: June 15, 2017
    Applicant: Fujikura Ltd.
    Inventors: Ken Katagiri, Nozomu Toyohara
  • Patent number: 4259321
    Abstract: Compositions and methods for the control of coccidiosis using antibiotic K-41 and its non-toxic salts as the active anti-coccidial agent.
    Type: Grant
    Filed: July 24, 1979
    Date of Patent: March 31, 1981
    Assignee: Shionogi & Co., Ltd.
    Inventors: Hiroshi Oikawa, Ken Katagiri, Harumoto Kawaguchi, Tetsuo Kitabatake, Koji Nakamoto
  • Patent number: 4247539
    Abstract: Hemagglutinin of Haemophilus gallinarum which is obtained by treating cells of Haemophilus gallinarum with trypsin and is useful for prevention and treatment of infectious coryza.
    Type: Grant
    Filed: February 22, 1979
    Date of Patent: January 27, 1981
    Inventors: Yoshikazu Iritani, Ken Katagiri, Hitoshi Arita, Jun'ichi Kawanami, deceased, by Emiko Kawanami, heir, Akira Kawanami, heir, Mariko Kawanami, heir