Patents by Inventor Koji Maejima

Koji Maejima 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).

  • Air filter, light source device, and air filter manufacturing method
    Patent number: 11229866
    Abstract: An air filter includes a first urethane portion made of polyurethane foam and having air permeability and a second urethane portion made of polyurethane foam and disposed so as to overlap with a part of the first urethane portion. The second urethane portion is higher in density than the first urethane portion. The first urethane portion and the second urethane portion are integrated with each other in a state where the second urethane portion is incorporated in the part of the first urethane portion.
    Type: Grant
    Filed: June 4, 2019
    Date of Patent: January 25, 2022
    Assignee: HAMAMATSU PHOTONICS K.K.
    Inventors: Kyoichi Murayama, Ryotaro Matui, Yasumasa Hakamata, Koji Maejima
  • Air filter, light source device, and air filter manufacturing method
    Patent number: 11192052
    Abstract: An air filter includes a first urethane portion made of polyurethane foam and having air permeability and a second urethane portion made of polyurethane foam and disposed so as to overlap with a part of the first urethane portion. The second urethane portion is higher in density than the first urethane portion. The first urethane portion and the second urethane portion are integrated with each other in a state where the second urethane portion is incorporated in the part of the first urethane portion.
    Type: Grant
    Filed: June 4, 2019
    Date of Patent: December 7, 2021
    Assignee: HAMAMATSU PHOTONICS K.K.
    Inventors: Kyoichi Murayama, Ryotaro Matui, Yasumasa Hakamata, Koji Maejima
  • AIR FILTER, LIGHT SOURCE DEVICE, AND AIR FILTER MANUFACTURING METHOD
    Publication number: 20190366253
    Abstract: An air filter includes a first urethane portion made of polyurethane foam and having air permeability and a second urethane portion made of polyurethane foam and disposed so as to overlap with a part of the first urethane portion. The second urethane portion is higher in density than the first urethane portion. The first urethane portion and the second urethane portion are integrated with each other in a state where the second urethane portion is incorporated in the part of the first urethane portion.
    Type: Application
    Filed: June 4, 2019
    Publication date: December 5, 2019
    Applicant: HAMAMATSU PHOTONICS K.K.
    Inventors: Kyoichi MURAYAMA, Ryotaro MATUI, Yasumasa HAKAMATA, Koji MAEJIMA
  • Ball circulating groove structure of ball nut
    Patent number: 7631572
    Abstract: In a ball circulating groove structure of a ball nut, a deflector is provided with an inner collar extending along a penetrating direction of a hole of the ball nut and engaging with the ball nut in a side of an inner surface of the ball nut, and an outer collar engaging with the ball nut in a side of an outer surface of the ball nut.
    Type: Grant
    Filed: June 12, 2007
    Date of Patent: December 15, 2009
    Assignee: Showa Corporation
    Inventors: Hiroshi Fujita, Shinobu Saito, Shinichi Sakaida, Koji Maejima
  • Ball Circulating Groove Structure of Ball Nut
    Publication number: 20080121058
    Abstract: In a ball circulating groove structure of a ball nut, a deflector is provided with an inner collar extending along a penetrating direction of a hole of the ball nut and engaging with the ball nut in a side of an inner surface of the ball nut, and an outer collar engaging with the ball nut in a side of an outer surface of the ball nut.
    Type: Application
    Filed: June 12, 2007
    Publication date: May 29, 2008
    Applicant: SHOWA CORPORATION
    Inventors: Hiroshi Fujita, Shinobu Saito, Shinichi Sakaida, Koji Maejima
  • Method of providing lubricity to synthetic yarns to be processed for false twisting with short heater
    Patent number: 5772910
    Abstract: A lubricating agent obtained by mixing a polyether compound and linear polyorganosiloxane of a specified type at a specified ratio is applied at a specified rate to synthetic yarns which are to be subjected to a false twisting process by a short heater so as to overcome problems of fuzz, yarn breakage and dyeing specks.
    Type: Grant
    Filed: August 14, 1997
    Date of Patent: June 30, 1998
    Assignee: Takemoto Yushi Kabushiki Kaisha
    Inventors: Hisao Yamamoto, Koji Maejima