Patents by Inventor Hideaki Kurokawa

Hideaki Kurokawa 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).

  • Publication number: 20180297866
    Abstract: Provided are a water treatment system and a water treatment method capable of downsizing a facility and inexpensively producing freshwater. A water treatment system includes: a first reverse osmosis treatment device for separating wastewater into desalinated permeate water and concentrated wastewater; a mixing unit for mixing the separated concentrated wastewater and intake seawater; a second reverse osmosis treatment device for separating mixed water obtained by mixing the concentrated wastewater and the seawater into desalinated permeate water and concentrated mixed water; and a return pipe for returning a portion of the separated concentrated mixed water to the mixing unit.
    Type: Application
    Filed: June 22, 2018
    Publication date: October 18, 2018
    Applicant: Hitachi, Ltd.
    Inventors: Shinichi YOSHIKAWA, Katsuhiro MIBU, Yukiko ICHIGE, Katsuhiko SHIMIZU, Hideaki KUROKAWA
  • Publication number: 20170088781
    Abstract: Provided is a crude oil recovery device for recovering crude oil from an oil-containing mixture in a stable manner and at low running cost. The crude oil recovery device for extracting crude oil from an oil-containing mixture composed of crude oil and both or one of water and solid, including an extraction tank for mixing the oil-containing mixture with an extracting solvent, and an evaporation/liquefaction unit for distilling an extraction solution after extraction, wherein naphtha, which is a crude oil component of the oil-containing mixture, is reused as the extracting solvent, the naphtha being a distillate obtained by distillation of the extraction solution.
    Type: Application
    Filed: September 23, 2016
    Publication date: March 30, 2017
    Applicant: HITACHI, LTD.
    Inventors: Tadashi SANO, Kazuhiro ENDOH, Yojiro HAYASHI, Hisashi ISOGAMI, Kei HAYASHIDA, Hideaki KUROKAWA, Masatomo WATANABE
  • Publication number: 20170001883
    Abstract: Provided are a water treatment system and a water treatment method capable of downsizing a facility and inexpensively producing freshwater. A water treatment system includes: a first reverse osmosis treatment device for separating wastewater into desalinated permeate water and concentrated wastewater; a mixing unit for mixing the separated concentrated wastewater and intake seawater; a second reverse osmosis treatment device for separating mixed water obtained by mixing the concentrated wastewater and the seawater into desalinated permeate water and concentrated mixed water; and a return pipe for returning a portion of the separated concentrated mixed water to the mixing unit.
    Type: Application
    Filed: June 14, 2016
    Publication date: January 5, 2017
    Applicant: Hitachi, Ltd.
    Inventors: Shinichi YOSHIKAWA, Katsuhiro MIBU, Yukiko ICHIGE, Katsuhiko SHIMIZU, Hideaki KUROKAWA
  • Patent number: 5300197
    Abstract: A distillation apparatus includes a distillation unit for distilling feed water. The distillation unit includes an evaporation part, a condensation part and a hydrophobic porous membrane interposed between the evaporation part and the condensation part, which are integrated with one another. A heating unit for heating the feed water and a cooling portion for cooling distillate produced by distillation of the feed water are provided apart from the distillation unit. One or both of the heating unit and the cooling unit are provided with a heat pump. With this construction, an additional heater does not need to be provided, and the distillation unit and both of the heating unit and the cooling unit can be changed in size and performance independently of each other, so that the overall size of the distillation apparatus can be reduced.
    Type: Grant
    Filed: December 10, 1990
    Date of Patent: April 5, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Kenji Mitani, Akira Ashida, Katsuya Ebara, Hideaki Kurokawa
  • Patent number: 5105556
    Abstract: Vapor is separated from mist accompanying the vapor by passing the vapor through a porous membrane. The vapor having passed through the membrane is brought into contact with an object to be washed and condenses thereon, whereby the object is washed.
    Type: Grant
    Filed: August 9, 1988
    Date of Patent: April 21, 1992
    Assignee: Hitachi, Ltd.
    Inventors: Hideaki Kurokawa, Katsuya Ebara, Sankichi Takahashi, Harumi Matsuzaki, Hiroaki Yoda, Takahisa Nitta, Isao kouchi, Yukio Hishinuma
  • Patent number: 5018367
    Abstract: A cooling energy generator with a cooling energy accumulator comprises a refrigerant, absorbent liquid, and a container having a first chamber receiving the absorbent liquid, a second chamber receiving the liquid refrigerant and a vapor passage communicating with a space over the absorbent liquid in the first chamber and with a space over the liquid refrigerant in the second chamber. The absorbent liquid is sprayed in the first chamber, and the absorbent liquid is cooled during an accelerated cooling operation. The absorbent liquid is heated during the cooling energy accumulation operation, and liquid refrigerant is sprayed in the second chamber during the accelerated cooling operation and during the normal cooling operation. An air conditioning heat exchanger supplies the cooling energy to a cooling device for air conditioning, and a heat pump is provided.
    Type: Grant
    Filed: July 31, 1989
    Date of Patent: May 28, 1991
    Assignee: Hitachi, Ltd.
    Inventors: Akira Yamada, Isao Ohkouchi, Yasuo Koseki, Hideaki Kurokawa, Katsuya Ebara, Sankichi Takahashi, Risuke Onoda, Shigeo Sugimoto
  • Patent number: 4986079
    Abstract: A coldness generating apparatus comprising: an absorption type refrigerator having an evaporator for evaporating refrigerant, an absorber in which an absorbent for absorbing the thus-evaporated refrigerant steam is contained, a regenerator for heating and condensing the absorbent which has been diluted by the refrigerant steam, and a condenser for condensing and liquidizing the refrigerant steam which has been evaporated by heating and condensing the absorbent. A regenerating tank regenerates coldness generated by the evaporator, and the refrigerant comprises refrigerant having the solidification temperature lower than the freezing point so that coldness which is lower than the freezing point and which has been generated in the evaporator is regenerated in the form of ice or ice slurry. Since coldness can be regenerated at high density, cooling performance can be improved.
    Type: Grant
    Filed: August 9, 1989
    Date of Patent: January 22, 1991
    Assignee: Hitachi, Ltd.
    Inventors: Yasuo Koseki, Akira Yamada, Hideaki Kurokawa, Isao Ohkouchi, Katsuya Ebara, Sankichi Takahashi
  • Patent number: 4953694
    Abstract: A distilling apparatus includes an evaporation section which heats raw water and causes the generation of vapor from said raw water, and a hydrophobic porous film through which the thus generated vapor is filtered. Because vapor separated from the raw water is supplied to one surface of the hydrophobic porous film, the proportion of the vapor relative to the fluid supplied to that surface of the film can be increased, thereby enabling the efficient filtering of a large amount of vapor through the film. In addition, because the temperature of condensed water obtained by cooling the vapor can be kept in the vicinity of the boiling point thereof, any gases and volatile substances contained in the raw water are prevented from dissolving in the distilled water, thereby enabling the production of extremely pure distilled water.
    Type: Grant
    Filed: June 17, 1988
    Date of Patent: September 4, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Nobuatsu Hayashi, Sankichi Takahashi, Katsuya Ebara, Hideaki Kurokawa, Akira Yamada, Yasuo Koseki, Harumi Matsuzaki, Hiroaki Yoda
  • Patent number: 4879041
    Abstract: The present invention relates to a process for producing ultra-pure water, an apparatus for producing said ultra-pure water and a process for using the ultra-pure water produced according to said process. More particularly, the present invention relates to a process for producing ultra-pure water which comprises boiling a raw water to vaporize off the volatile components from the raw water, subsequently generating steam from the water, contacting the steam with a hydrophobic, porous, gas-permeable and liquid-impermeable membrane to make the steam permeate the membrane, and then condensing the steam, as well as to an apparatus for producing said ultra-pure water and a process for using said ultra-pure water.
    Type: Grant
    Filed: March 24, 1988
    Date of Patent: November 7, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Hideaki Kurokawa, Akira Yamada, Yasuo Koseki, Harumi Matsuzaki, Katsuya Ebara, Sankichi Takahashi, Hiroaki Yoda, Nobuatsu Hayashi, Isao Okouchi, Yukio Hishinuma, Naohiro Momma
  • Patent number: 4783277
    Abstract: An absorbent in a solution which comprises at least one of bromides taking a dihydrate form at room temperature and at least one of halides taking a hexahydrate form at room temperature has a high solubility and a low cost, and is used in a closed, cyclic absorption-type refrigerator.
    Type: Grant
    Filed: August 19, 1987
    Date of Patent: November 8, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Yasuo Koseki, Akira Yamada, Hideaki Kurokawa, Katsuya Ebara, Sankichi Takahashi
  • Patent number: 4746437
    Abstract: The method and apparatus for concentration aqueous solution in accordance with the present invention is characterized in that a hydrophobic porous membrane through which vapor can permeate, but not liquid, is brought into contact with an aqueous solution containing a solute at a concentration of at least 30%, and the water contained in the aqueous solution at the interface with the membrane is evaporated and permeates through the membrane. A method and an apparatus of recovering temperature of an aqueous solution comprising an aqueous solution concentration step in which the aqueous solution contact with the membrane, the water being evaporated; and a dilution step in which the resultant concentrated solution is diluted; wherein a temperature is obtained higher or lower than that of said aqueous solution.
    Type: Grant
    Filed: February 22, 1985
    Date of Patent: May 24, 1988
    Assignee: Hitachi, Ltd.
    Inventors: Yasuo Koseki, Sankichi Takahashi, Katsuya Ebara, Osamu Kuroda, Hideaki Kurokawa