Patents by Inventor Hiroyuki Hamada

Hiroyuki Hamada 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).

  • Braid and braiding method
    Patent number: 5385077
    Abstract: A braiding method comprising moving bobbin carriers along tracks connecting a plurality of braiding regions to braid cords or strands in a specific braiding region, in another braiding region or in all the braiding regions. The braid may be used as core structure for fiber-reinforced plastics.
    Type: Grant
    Filed: January 19, 1993
    Date of Patent: January 31, 1995
    Assignee: Murata Kikai Kabushiki Kaisha
    Inventors: Yasuo Akiyama, Zenichiro Maekawa, Hiroyuki Hamada, Atsushi Yokoyama, Yasushi Uratani
  • Braiding apparatus for a tubular braid structure
    Patent number: 5361674
    Abstract: The apparatus comprises a tubular braid machine, a mandrel having branched portions, a holding body for the mandrel capable of effecting upward movement, downward movement, horizontal movement about a braiding point or rotation within a vertical surface, an annular guide detachably mounted at a braiding position to a mandrel main portion, an annular guide detachably mounted at a braiding position to a mandrel branch portion, and a closeable annular guide detachably mounted therebelow.
    Type: Grant
    Filed: October 21, 1993
    Date of Patent: November 8, 1994
    Assignee: Murata Kikai Kabushiki Kaisha
    Inventors: Yasuo Akiyama, Zenichiro Maekawa, Hiroyuki Hamada, Atsushi Yokoyama
  • Speaker system
    Patent number: 5333204
    Abstract: A speaker system has a bass-reflex duct provided in a cabinet. A sub-duct is provided on a central portion of the bass-reflex duct. The sub-duct is communicated with the bass-reflex duct, and filled with sound absorbing material for absorbing unnecessary resonance generated in the bass-reflex duct.
    Type: Grant
    Filed: April 1, 1992
    Date of Patent: July 26, 1994
    Assignee: Pioneer Electronic Corporation
    Inventors: Hiroyuki Hamada, Takahiro Naka
  • Method and apparatus for braiding in two braiding regions
    Patent number: 5287790
    Abstract: A braiding apparatus and method for moving bobbin carriers along tracks connecting a plurality of braiding regions to braid cords or strands in a specific braiding region, in another braiding region or in all the braiding regions. The braid may be used as core structure for fiber-reinforced plastics.
    Type: Grant
    Filed: January 25, 1993
    Date of Patent: February 22, 1994
    Assignee: Murata Kikai Kabushiki Kaisha
    Inventors: Yasuo Akiyama, Zenichiro Maekawa, Hiroyuki Hamada, Atsushi Yokoyama
  • Energy absorbing structure
    Patent number: 5264259
    Abstract: The energy absorbing structure of the present invention comprises a cylindrical hollow body of a fiber reinforced thermoplastic resin wherein both the ends are open, the cylindrical hollow body being attached to the outer wall of a moving body or the outer wall of a stationary body with which the moving body comes in contact in such a manner that the opening of the hollow body faces the outer wall.
    Type: Grant
    Filed: January 15, 1992
    Date of Patent: November 23, 1993
    Assignee: The Yokohama Rubber Co., Ltd.
    Inventors: Hajime Satoh, Hiroshi Hirakawa, Hiroyuki Hamada
  • Horn loadspeaker
    Patent number: 5233136
    Abstract: A horn loudspeaker has an opening formed in a wall of a horn, and a tubular duct is provided along the horn and communicated with the opening. The length L of the duct is expressed as, L.perspectiveto.c/4fr-0.4d where c is a velocity of sound, fr is a frequency a sound pressure of which is to be reduced, and d is an inner diameter of the duct.
    Type: Grant
    Filed: July 28, 1992
    Date of Patent: August 3, 1993
    Assignee: Pioneer Electronic Corporation
    Inventor: Hiroyuki Hamada
  • Laminated light-polarizing sheet
    Patent number: 4230768
    Abstract: A laminated light-polarizing sheet having an excellent humidity resistance with dimensional stability under a high humidity as well as an excellent light resistance comprising a light-polarizing film of a halogenated vinyl or vinylidene polymer containing polyene chains formed by partial dehydrohalogenation and a film or sheet of an acrylate or methacrylate polymer laminated on at least one surface of the light-polarizing film.
    Type: Grant
    Filed: March 29, 1979
    Date of Patent: October 28, 1980
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Hiroyuki Hamada, Rinjiro Ichikawa, Hajime Suzuki
  • Light-polarizing film
    Patent number: 4229498
    Abstract: A light-polarizing film comprising a polymer mixture containing a polymer having polyene chains formed by partial dehydrohalogenation of a halogenated vinyl polymer or a halogenated vinylidene polymer and one or more of the polymers selected from the group consisting of acrylate polymers and methacrylate polymers. Said light-polarizing film has excellent heat stability as well as humidity resistance and is useful in various fields including liquid crystal device, optical device, etc.
    Type: Grant
    Filed: March 29, 1979
    Date of Patent: October 21, 1980
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Hajime Suzuki, Hiroyuki Hamada, Rinjiro Ichikawa