Patents by Inventor Daisuke Karube

Daisuke Karube 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).

  • Patent number: 12590235
    Abstract: An object of the present invention is to provide a novel mixed refrigerant having a low GWP. To achieve the above object, the present invention provides a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), and trans-1,3,3,3-tetrafluoropropene (R1234ze(E)).
    Type: Grant
    Filed: December 14, 2021
    Date of Patent: March 31, 2026
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Mitsushi Itano, Daisuke Karube, Shun Ohkubo
  • Publication number: 20260062372
    Abstract: The present disclosure provides a method for producing a composition comprising a purified fluorine-containing ether compound represented by formula (1): CHX1X2CF2OX3, wherein X1 and X2 are the same or different and each represents a hydrogen atom, a fluorine atom, or a trifluoromethyl group, and X3 represents a C1-6 alkyl group, provided that not both X1 and X2 are trifluoromethyl groups.
    Type: Application
    Filed: November 6, 2025
    Publication date: March 5, 2026
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Daisuke KARUBE, Kenta NISHIMURA, Yuuki SUZUKI, Tsubasa NAKAUE, Yoshichika KUROKI, Michiaki OKADA
  • Patent number: 12480029
    Abstract: Provided is a novel low-GWP mixed refrigerant. A composition comprising a refrigerant, the refrigerant comprising 1,1-difluoroethylene (HFO-1132a) and difluoromethane (R32), wherein HFO-1132a is present in an amount of 26 to 40 mass % based on the total of HFO-1132a and R32, and R32 is present in an amount of 60 to 74 mass % based on the total of HFO-1132a and R32.
    Type: Grant
    Filed: December 22, 2021
    Date of Patent: November 25, 2025
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Mitsushi Itano, Shun Ohkubo, Daisuke Karube, Satoshi Tokuno
  • Patent number: 12441922
    Abstract: The present invention addresses a problem of providing a mixed refrigerant that combines three kinds of performances of having a refrigeration capacity (this may also be referred to as a cooling capacity) and of having a coefficient of performance (COP) equivalent to those of R410A, and of having a sufficiently small GWP. As a means for solving the problem, provided is a refrigerant-containing composition, wherein the refrigerant contains trans-1,2-difluoroethylene (HFO-1132 (E)), trifluoroethylene (HFO-1123) and 2,3,3,3-tetrafluoro-1-propene (R1234yf), and R32.
    Type: Grant
    Filed: December 17, 2021
    Date of Patent: October 14, 2025
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Mitsushi Itano, Shun Ohkubo, Daisuke Karube
  • Patent number: 12379140
    Abstract: In an air conditioner that uses a refrigerant mixture containing at least 1,2-difluoroethylene, high efficiency is achieved. In the air conditioner (1), a compressor (100, 200) can be driven without interposing a power conversion device between an AC power source (90, 190) and a motor (70, 170). Thus, it is possible to provide the air conditioner (1) that is environmentally friendly and has a relatively inexpensive configuration.
    Type: Grant
    Filed: December 9, 2022
    Date of Patent: August 5, 2025
    Assignee: DAIKIN INDUSTRIES., LTD.
    Inventors: Keisuke Ohtsuka, Mitsushi Itano, Daisuke Karube, Yuuki Yotsumoto, Kazuhiro Takahashi, Tetsushi Tsuda
  • Patent number: 12319864
    Abstract: An object is to provide a novel low-GWP mixed refrigerant. A solution to the problem is to provide a composition containing a refrigerant that contains trans-1,2-difluoroethylene (HFO-1132(E)) and 1,3,3,3-tetrafluoropropene (R1234ze).
    Type: Grant
    Filed: December 16, 2021
    Date of Patent: June 3, 2025
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Mitsushi Itano, Shun Ohkubo, Daisuke Karube
  • Patent number: 12291665
    Abstract: An object is to provide a novel low-GWP mixed refrigerant. Provided as a means for a solution is a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (R32), 1,3,3,3-tetrafluoropropene (R1234ze), and carbon dioxide.
    Type: Grant
    Filed: December 16, 2021
    Date of Patent: May 6, 2025
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Mitsushi Itano, Shun Ohkubo, Daisuke Karube
  • Publication number: 20250123037
    Abstract: Provided are a method for stably transporting fluoroethylene in a refrigeration system or air conditioning system, and a refrigeration method. The method for transporting a heat transfer fluid of the present disclosure is a method for transporting a heat transfer fluid in a refrigeration system or air conditioning system, including the step of circulating the heat transfer fluid through at least one hose in the system, wherein the heat transfer fluid contains fluoroethylene, and the at least one hose is formed of a resin. The method for transporting a heat transfer fluid according to the present disclosure enables stable transportation of fluoroethylene in a refrigeration system or in an air conditioning system.
    Type: Application
    Filed: December 20, 2024
    Publication date: April 17, 2025
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Shohei AJIOKA, Daisuke KARUBE, Yukinori KAMIYA
  • Publication number: 20250115796
    Abstract: A refrigeration cycle apparatus (1) is capable of performing a refrigeration cycle using a small-GWP refrigerant. The refrigeration cycle apparatus (1) includes a refrigerant circuit (10) and a refrigerant enclosed in the refrigerant circuit (10). The refrigerant circuit includes a compressor (21), a condenser (23), a decompressing section (24), and an evaporator (31). The refrigerant contains is a small-GWP refrigerant.
    Type: Application
    Filed: December 19, 2024
    Publication date: April 10, 2025
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Eiji KUMAKURA, Takuro YAMADA, Atsushi YOSHIMI, Ikuhiro IWATA, Yoshinari ASANO, Keisuke OHTSUKA, Keiji AOTA, Mitsushi ITANO, Shun OHKUBO, Tatsuya TAKAKUWA, Daisuke KARUBE, Yuuki YOTSUMOTO, Kenji GOBOU, Hitomi KUROKI, Tomoyuki GOTOU, Akihito MIZUNO, Yasufu YAMADA, Tatsumi TSUCHIYA, Yuuichi YANAGI, Yoshikazu NAKAO, Takeo ABE, Yumi TODA, Tetsushi TSUDA
  • Patent number: 12270575
    Abstract: A warm-water generating apparatus (1) uses, as a refrigerant, a mixed refrigerant containing at least 1,2-difluoroethylene (HFO-1132(E)). The warm-water generating apparatus (1) includes a compressor (21), a heat-source-side air heat exchanger (24), an expansion valve (23), and a use-side water heat exchanger (22). The water heat exchanger (22) causes the mixed refrigerant flowing therein and first water to exchange heat with each other to heat the first water.
    Type: Grant
    Filed: June 26, 2020
    Date of Patent: April 8, 2025
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Masanori Ukibune, Atsushi Okamoto, Mitsushi Itano, Daisuke Karube, Yuuki Yotsumoto, Kazuhiro Takahashi, Yuzo Komatsu, Shun Ohkubo, Tatsuya Takakuwa
  • Patent number: 12241014
    Abstract: Provided is a novel, low-GWP mixed refrigerant. A composition contains a refrigerant that contains trans-1,2-difluoroethylene (HFO-1132(E)), trifluoroethylene (HFO-1123), and 1,3,3,3-tetrafluoropropene (R1234ze).
    Type: Grant
    Filed: December 15, 2021
    Date of Patent: March 4, 2025
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Mitsushi Itano, Shun Ohkubo, Daisuke Karube
  • Patent number: 12180408
    Abstract: An object of the present disclosure is to provide a novel low-GWP mixed refrigerant. To solve this problem, the present disclosure provides a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132 (E)), trifluoroethylene (HFO-1123), 1,3,3,3-tetrafluoropropene (R1234ze), and difluoromethane (R32).
    Type: Grant
    Filed: December 13, 2021
    Date of Patent: December 31, 2024
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Mitsushi Itano, Shun Ohkubo, Daisuke Karube
  • Publication number: 20240425739
    Abstract: A composition comprising a refrigerant and an antioxidant, the refrigerant containing a fluoroethylene, the antioxidant being present in an amount of 1 to 20000 ppm by mass based on the mass of the fluoroethylene, and the total mass of the refrigerant and the antioxidant accounting for 95 mass? or more of the entire composition taken as 100 mass %.
    Type: Application
    Filed: September 5, 2024
    Publication date: December 26, 2024
    Applicant: Daikin Industries, Ltd.
    Inventors: Daisuke KARUBE, Ryuo Ito, Kenji Gobou, Tsubasa Nakaue
  • Publication number: 20240309255
    Abstract: Provided is a composition comprising fluoroethylene and an epoxide having 6 or less carbon atoms.
    Type: Application
    Filed: May 24, 2024
    Publication date: September 19, 2024
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Daisuke KARUBE, Ryuo ITO, Kenji GOBOU, Tsubasa NAKAUE, Tatsumi TSUCHIYA
  • Publication number: 20240218226
    Abstract: No studies have been made regarding what kinds of refrigerants should be used in a refrigeration cycle device for a vehicle. An air conditioner (1) for a vehicle includes a refrigerant circuit (10) and a refrigerant that is sealed in the refrigerant circuit (10). The refrigerant circuit (10) includes a compressor (80), a first heat exchanger (85), which serves as a heat dissipater in a dehumidifying heating mode, an outside-air heat exchanger (82), a cooling control valve (87), and a second heat exchanger (86), which serves as an evaporator in the dehumidifying heating mode. The refrigerant is a refrigerant having a low GWP.
    Type: Application
    Filed: January 30, 2024
    Publication date: July 4, 2024
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Eiji KUMAKURA, Kazuhiro FURUSHO, Masaru TANAKA, Shun ONKUBO, Mitsushi ITANO, Yuuki YOTSUMOTO, Akihito MIZUNO, Tomoyuki GOTOU, Yasufu YAMADA, Tatsumi TSUCHIYA, Kenji GOBOU, Hitomi KUROKI, Daisuke KARUBE, Tatsuya TAKAKUWA, Tetsushi TSUDA
  • Publication number: 20240174905
    Abstract: A showcase includes a refrigerant circuit and a refrigerant enclosed in the refrigerant circuit. The refrigerant circuit includes a compressor (121), a radiator (122), an expansion valve (123), and an evaporator (124). The refrigerant is a low-GWP refrigerant.
    Type: Application
    Filed: February 2, 2024
    Publication date: May 30, 2024
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Shinichi FUJINAKA, Masaru TANAKA, Shun OHKUBO, Mitsushi ITANO, Yuuki YOTSUMOTO, Akihito MIZUNO, Tomoyuki GOTOU, Yasufu YAMADA, Hitomi KUROKI, Tatsumi TSUCHIYA, Kenji GOBOU, Daisuke KARUBE, Tatsuya TAKAKUWA
  • Patent number: 11981883
    Abstract: A composition containing 1,2-dichloro-3,3,3-trifluoropropene (HCFO-1223xd) and a fluorine-based oil.
    Type: Grant
    Filed: August 5, 2019
    Date of Patent: May 14, 2024
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Daisuke Karube, Yuuko Tsutsui
  • Patent number: 11920077
    Abstract: No studies have been made regarding what kinds of refrigerants should be used in a refrigeration cycle device for a vehicle. An air conditioner (1) for a vehicle includes a refrigerant circuit (10) and a refrigerant that is sealed in the refrigerant circuit (10). The refrigerant circuit (10) includes a compressor (80), a first heat exchanger (85), which serves as a heat dissipater in a dehumidifying heating mode, an outside-air heat exchanger (82), a cooling control valve (87), and a second heat exchanger (86), which serves as an evaporator in the dehumidifying heating mode. The refrigerant is a refrigerant having a low GWP.
    Type: Grant
    Filed: July 16, 2019
    Date of Patent: March 5, 2024
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Eiji Kumakura, Kazuhiro Furusho, Masaru Tanaka, Shun Ohkubo, Mitsushi Itano, Yuuki Yotsumoto, Akihito Mizuno, Tomoyuki Gotou, Yasufu Yamada, Tatsumi Tsuchiya, Kenji Gobou, Hitomi Kuroki, Daisuke Karube, Tatsuya Takakuwa, Tetsushi Tsuda
  • Patent number: 11912922
    Abstract: A showcase includes a refrigerant circuit and a refrigerant enclosed in the refrigerant circuit. The refrigerant circuit includes a compressor (121), a radiator (122), an expansion valve (123), and an evaporator (124). The refrigerant is a low-GWP refrigerant.
    Type: Grant
    Filed: July 16, 2019
    Date of Patent: February 27, 2024
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Shinichi Fujinaka, Masaru Tanaka, Shun Ohkubo, Mitsushi Itano, Yuuki Yotsumoto, Akihito Mizuno, Tomoyuki Gotou, Yasufu Yamada, Hitomi Kuroki, Tatsumi Tsuchiya, Kenji Gobou, Daisuke Karube, Tatsuya Takakuwa
  • Patent number: 11906207
    Abstract: A two-stage refrigeration apparatus (500) includes a first cycle (510) and a second cycle (520). The first cycle (510) includes a first compressor (511), a first condenser (512), a first expansion mechanism (513), and a first evaporator (514) that are arranged in such a manner as to be connected to the first cycle. A first refrigerant circulates through the first cycle. The second cycle (520) includes a second downstream-side condenser (523) and a second evaporator (527) that are arranged in such a manner as to be connected to the second cycle. A second refrigerant circulates through the second cycle. The first evaporator (514) and the second downstream-side condenser (523) constitute a cascade condenser (531). In the cascade condenser (531), heat is exchanged between the first refrigerant and the second refrigerant. At least one of the first refrigerant and the second refrigerant is a refrigerant mixture containing at least 1,2-difluoroethylene (HFO-1132(E)).
    Type: Grant
    Filed: June 26, 2020
    Date of Patent: February 20, 2024
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Eiji Kumakura, Takuro Yamada, Atsushi Yoshimi, Ikuhiro Iwata, Mitsushi Itano, Daisuke Karube, Yuuki Yotsumoto, Kazuhiro Takahashi, Tatsuya Takakuwa, Yuzo Komatsu, Shun Ohkubo