Patents by Inventor Takeshi Kitazawa

Takeshi Kitazawa 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).

  • Apparatus and system for generating nitrogen gas through dehumidifying and filtering fuel cell exhaust gas
    Patent number: 11978935
    Abstract: An apparatus/system for generating a high-purity nitrogen gas using a fuel cell includes; a fuel cell that operates by taking in air or a gas containing nitrogen and oxygen, and a fuel gas; a dehumidification mechanism that reduces moisture or water vapor content in an exhaust gas that is extracted from the fuel cell and has a lower oxygen concentration than air; and a filtering mechanism which includes a filter using fibers having different degrees of permeation for nitrogen and oxygen and converts the exhaust gas having a reduced moisture or water vapor content into a gas having an increased nitrogen concentration. The filter recovery ratio is higher when an oxygen concentration of a gas to be filtered is lower. The dehumidification mechanism is a pump unit including a water seal pump to provide an adiabatic expansion chamber in which the exhaust gas extracted from the fuel cell expands adiabatically.
    Type: Grant
    Filed: February 22, 2021
    Date of Patent: May 7, 2024
    Assignee: MICRO CONTROL SYSTEMS LTD.
    Inventors: Katsumichi Tagami, Soichi Hashiba, Takeshi Kitazawa, Noboru Fujii
  • APPARATUS AND METHOD FOR GENERATING NITROGEN GAS THROUGH DEHUMIDIFYING AND FILTERING FUEL-CELL EXHAUST GAS
    Publication number: 20220311035
    Abstract: An apparatus/system for generating a high-purity nitrogen gas using a fuel cell includes; a fuel cell that operates by taking in air or a gas containing nitrogen and oxygen, and a fuel gas; a dehumidification mechanism that reduces moisture or water vapor content in an exhaust gas that is extracted from the fuel cell and has a lower oxygen concentration than air; and a filtering mechanism which includes a filter using fibers having different degrees of permeation for nitrogen and oxygen and converts the exhaust gas having a reduced moisture or water vapor content into a gas having an increased nitrogen concentration. The filter recovery ratio is higher when an oxygen concentration of a gas to be filtered is lower. The dehumidification mechanism is a pump unit including a water seal pump to provide an adiabatic expansion chamber in which the exhaust gas extracted from the fuel cell expands adiabatically.
    Type: Application
    Filed: February 22, 2021
    Publication date: September 29, 2022
    Applicant: MICRO CONTROL SYSTEMS LTD.
    Inventors: Katsumichi TAGAMI, Soichi HASHIBA, Takeshi KITAZAWA, Noboru FUJII
  • Liquid crystal display panel with polymer spacers containing a percentage of epoxy groups
    Patent number: 4983023
    Abstract: A liquid crystal display panel comprises at least two base plates spaced by a sealant on the peripheral portion of the plates and liquid crystal in the space between the base plates. The liquid crystal contains a spacer of rigid particles and polymer particles having 10 to 30% by weight of an epoxy group.
    Type: Grant
    Filed: October 6, 1988
    Date of Patent: January 8, 1991
    Assignees: Sharp Kabushiki Kaisha, Kitazawa Yakuhin Co., Ltd., Tosoh Corporation
    Inventors: Kenichi Nakagawa, Takeshi Kitazawa, Takashi Kitamura