Patents by Inventor Toshihiro Kikukawa

Toshihiro Kikukawa 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).

  • Refrigeration system, and method of updating and operating the same
    Patent number: 6510698
    Abstract: A heat source unit and refrigerant used in an existing refrigeration system are replaced with new refrigerant and a new heat source unit which employs the new refrigerant and is equipped with an oil separator and extraneous-matter trapping device. An indoor unit of the existing refrigeration system may be used, in its present form, or replaced with a new indoor unit. Further, connecting pipes used for the existing refrigeration are reused. After replacement of refrigerant, the refrigeration system performs an ordinary operation after having performed a cleaning operation. The extraneous-matter trapping device is provided in a refrigerant pipe close to the heat source unit or in a bypass channel connected to the refrigerant pipe close to the heat source unit. Alternatively, only the heat source unit of the existing refrigeration system is replaced with a new one, and there is employed refrigeration oil which has no mutual solubility with respect to HFC or has very low mutual solubility.
    Type: Grant
    Filed: May 17, 2000
    Date of Patent: January 28, 2003
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Tomohiko Kasai, Mitsunori Kurachi, Hidekazu Tani, Moriya Miyamoto, Yoshihiro Sumida, Takashi Ikeda, Toshihiro Kikukawa, Shohichiroh Masuda, Hirofumi Koge
  • Refrigeration system, and method of updating and operating the same
    Publication number: 20020026800
    Abstract: A heat source unit and refrigerant used in an existing refrigeration system are replaced with new refrigerant and a new heat source unit which employs the new refrigerant and is equipped with an oil separator and extraneous-matter trapping means. An indoor unit of the existing refrigeration system may be used, in its present form, or replaced with a new indoor unit. Further, connecting pipes used for the existing refrigeration are reused. After replacement of refrigerant, the refrigeration system performs an ordinary operation after having performed a cleaning operation. The extraneous-matter trapping means is provided in a refrigerant pipe close to the heat source unit or in a bypass channel connected to the refrigerant pipe close to the heat source unit. Alternatively, only the heat source unit of the existing refrigeration system is replaced with a new one, and there is employed refrigeration oil which has no mutual solubility with respect to HFC or has very low mutual solubility.
    Type: Application
    Filed: May 17, 2000
    Publication date: March 7, 2002
    Inventors: Tomohiko Kasai, Mitsunori Kurachi, Hidekazu Tani, Moriya Miyamoto, Yoshihiro Sumida, Takashi Ikeda, Toshihiro Kikukawa, Shohichiroh Masuda, Hirofumi Koge