Patents by Inventor Yukio SAKUMA

Yukio SAKUMA 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: 20250219177
    Abstract: A method for recovering lithium from waste lithium-ion batteries, the method including: a dissolution step of dissolving active material powder obtained by pre-processing waste lithium-ion batteries in a mineral acid; a neutralization step of adding at least one selected from the group consisting of sodium hydroxide and potassium hydroxide to a solution obtained in the dissolution step; a solvent extraction step of separating at least one metal excluding lithium from a solution obtained in the neutralization step by organic solvent extraction to obtain an alkali mixed salt aqueous solution; a separation step of separating each of a lithium salt and a salt of at least one selected from the group consisting of sodium and potassium from the alkali mixed salt aqueous solution; and a lithium recovery step of recovering lithium from a first lithium salt aqueous solution obtained in the separation step.
    Type: Application
    Filed: May 26, 2023
    Publication date: July 3, 2025
    Inventors: Keita YAMADA, Yukio SAKUMA, Taro HIRAOKA
  • Publication number: 20250167328
    Abstract: A method for recovering lithium from waste lithium ion batteries includes: dissolving active material powder obtained by pre-processing the waste lithium ion batteries in a mineral acid to obtain a solution; neutralizing the solution with lithium hydroxide; re-adding lithium hydroxide to the acid solution to which lithium hydroxide has been added and filtering precipitates to obtain a first lithium salt aqueous solution as a filtrate; and subjecting the first lithium salt aqueous solution to membrane electrolysis using an ion exchange membrane to obtain a lithium hydroxide aqueous solution, an acid, and a second lithium salt aqueous solution that is more dilute than the first lithium salt aqueous solution, and the lithium hydroxide aqueous solution obtained is reused in the neutralization step and/or the lithium hydroxide re-addition step, and the acid obtained is reused as the mineral acid used in the dissolution step.
    Type: Application
    Filed: April 7, 2023
    Publication date: May 22, 2025
    Inventors: Keita YAMADA, Yukio SAKUMA, Taro HIRAOKA
  • Publication number: 20250168617
    Abstract: The technology makes wireless roaming decisions for a computing device. The device is configured to determine whether to consider roaming and to generate a roam reason. The device determines a quality score for at least one access point within a wireless communication range of the device based at least in part on the roam reason. A target access point with a highest quality score is selected. The device may then determine to roam to the target access point, if the target access point is not the current access point to which the device is connected.
    Type: Application
    Filed: January 17, 2025
    Publication date: May 22, 2025
    Inventors: Hayden Tadashi Nix, Marc Naji Champagne Khouri, Naomi Jade McCracken, Kevin Yukio Sakuma, Rebecca Silberstein
  • Patent number: 12294053
    Abstract: Provided is a method for producing a high-purity aqueous lithium salt solution, the method allowing filtering aluminum phosphate in a short time. The method for producing a high-purity aqueous lithium salt solution includes: a step of adjusting the pH of a slurry containing a mixture of lithium phosphate and aluminum hydroxide obtained from a first aqueous lithium salt solution being a raw material to a range of 2 to 3 to obtain a precipitate of aluminum phosphate; a step of filtering off and removing the precipitate of aluminum phosphate to obtain a second aqueous lithium salt solution; and a step of purifying the second aqueous lithium salt solution to obtain a high-purity aqueous lithium salt solution.
    Type: Grant
    Filed: September 28, 2021
    Date of Patent: May 6, 2025
    Assignee: Asaka Riken Co., Ltd.
    Inventors: Keita Yamada, Yukio Sakuma, Hiroto Inoue
  • Patent number: 12238819
    Abstract: The technology makes wireless roaming decisions for a computing device. The device is configured to determine whether to consider roaming and to generate a roam reason. The device determines a quality score for at least one access point within a wireless communication range of the device based at least in part on the roam reason. A target access point with a highest quality score is selected. The device may then determine to roam to the target access point, if the target access point is not the current access point to which the device is connected.
    Type: Grant
    Filed: June 2, 2022
    Date of Patent: February 25, 2025
    Assignee: GOOGLE LLC
    Inventors: Hayden Tadashi Nix, Marc Naji Champagne Khouri, Naomi Jade McCracken, Kevin Yukio Sakuma, Rebecca Silberstein
  • Publication number: 20250043391
    Abstract: Provided is a method for recovering lithium from lithium-salt-containing aqueous solution by using small-scale equipment in a short time. The method for recovering lithium from lithium-salt-containing aqueous solution includes an aluminum hydroxide producing step of producing aluminum hydroxide in the aqueous liquid containing a lithium salt. In one embodiment of this lithium recovery method, aluminum phosphate is removed from a first slurry containing a mixture of lithium phosphate obtained from a first aqueous lithium salt solution and aluminum hydroxide to provide a second aqueous lithium salt solution, a second slurry obtained by adding an aluminum salt to the second aqueous lithium salt solution is adjusted to a specific condition, and a precipitate of aluminum phosphate is filtered off and removed from the second aqueous lithium salt solution to provide a high-purity aqueous lithium salt solution.
    Type: Application
    Filed: December 28, 2022
    Publication date: February 6, 2025
    Inventors: Keita YAMADA, Yukio SAKUMA, Taro HIRAOKA, Hiroto INOUE
  • Publication number: 20250007022
    Abstract: Provided is a method for recovering lithium from waste lithium-ion batteries that can recover lithium at a high recovery rate and enables resource circulation. In the method for recovering lithium from waste lithium-ion batteries, active material powder obtained by pre-processing waste lithium-ion batteries is dissolved in a mineral acid, an alkali metal hydroxide is added to the obtained acid solution, and then at least one metal excluding lithium, out of the metals contained in the active material powder, is separated by solvent extraction to obtain a first alkali metal salt aqueous solution. The first alkali metal salt aqueous solution is electrolyzed using an ion exchange membrane. An alkali metal hydroxide aqueous solution obtained by the electrolysis is used as the alkali metal hydroxide to be added to the acid solution, or used for the solvent extraction. An acid obtained by the electrolysis is used as the mineral acid.
    Type: Application
    Filed: September 30, 2022
    Publication date: January 2, 2025
    Inventors: Keita YAMADA, Yukio SAKUMA, Taro HIRAOKA
  • Publication number: 20240263268
    Abstract: The method for dissolving battery powder in hydrochloric acid according to the present invention includes: stirring battery powder containing valuable metals obtained from waste lithium batteries in hydrochloric acid with a concentration of 50 to 150 g/L at a mass ratio of 250 to 1000% relative to hydrogen chloride in the hydrochloric acid to provide a hydrochloric acid suspension of the battery powder; and adding a predetermined amount of hydrochloric acid to the hydrochloric acid suspension to set the concentration of hydrochloric acid in the hydrochloric acid suspension to 150 to 350 g/L, and then adjusting and stirring the hydrochloric acid suspension such that the proportion of battery powder in the hydrochloric acid suspension to a mass ratio of 50 to 200% relative to hydrogen chloride in the hydrochloric acid suspension to provide a hydrochloric acid solution of the battery powder.
    Type: Application
    Filed: September 29, 2022
    Publication date: August 8, 2024
    Inventors: Keita YAMADA, Yukio SAKUMA, Taro HIRAOKA, Jun NAKAZAWA, Hiroto INOUE
  • Publication number: 20240063453
    Abstract: Provided is a method for treating waste lithium-ion batteries, the method capable of providing battery powder without treatment of fluorine generated by thermal decomposition. In the present invention, a waste lithium-ion battery is heat-treated in a range of temperatures equal to or more than a temperature at which an electrolytic solution is evaporated to dryness and less than a temperature at which fluororesin is thermally decomposed.
    Type: Application
    Filed: January 18, 2022
    Publication date: February 22, 2024
    Inventors: Yukio SAKUMA, Taro HIRAOKA
  • Publication number: 20230396978
    Abstract: The technology makes wireless roaming decisions for a computing device. The device is configured to determine whether to consider roaming and to generate a roam reason. The device determines a quality score for at least one access point within a wireless communication range of the device based at least in part on the roam reason. A target access point with a highest quality score is selected. The device may then determine to roam to the target access point, if the target access point is not the current access point to which the device is connected.
    Type: Application
    Filed: June 2, 2022
    Publication date: December 7, 2023
    Inventors: Hayden Tadashi Nix, Marc Naji Champagne Khouri, Naomi Jade McCracken, Kevin Yukio Sakuma, Rebecca Silberstein
  • Publication number: 20230145941
    Abstract: Provided is a method for producing a high-purity aqueous lithium salt solution, the method allowing filtering aluminum phosphate in a short time. The method for producing a high-purity aqueous lithium salt solution includes: a step of adjusting the pH of a slurry containing a mixture of lithium phosphate and aluminum hydroxide obtained from a first aqueous lithium salt solution being a raw material to a range of 2 to 3 to obtain a precipitate of aluminum phosphate; a step of filtering off and removing the precipitate of aluminum phosphate to obtain a second aqueous lithium salt solution; and a step of purifying the second aqueous lithium salt solution to obtain a high-purity aqueous lithium salt solution.
    Type: Application
    Filed: September 28, 2021
    Publication date: May 11, 2023
    Inventors: Keita YAMADA, Yukio SAKUMA, Hiroto INOUE
  • Patent number: 11117114
    Abstract: A lithium carbonate production device is provided which can efficiently produce lithium carbonate without requiring a large pressure for supplying carbon dioxide gas, by a simple structure. A lithium carbonate production device (1) includes: a sealed reaction tank (2) which stores a lithium hydroxide aqueous solution A; a supply unit (3) for the lithium hydroxide aqueous solution; a carbon dioxide gas supply unit (4); a circulation unit (21) for the lithium hydroxide aqueous solution; and a nozzle which is provided at the head of the circulation unit (21) for the lithium hydroxide aqueous solution, and has a diameter which gradually decreases from a base end side to a head side.
    Type: Grant
    Filed: June 10, 2019
    Date of Patent: September 14, 2021
    Assignee: Asaka Riken Co., Ltd.
    Inventor: Yukio Sakuma
  • Publication number: 20210197169
    Abstract: A lithium carbonate production device is provided which can efficiently produce lithium carbonate without requiring a large pressure for supplying carbon dioxide gas, by a simple structure. A lithium carbonate production device (1) includes: a sealed reaction tank (2) which stores a lithium hydroxide aqueous solution A; a supply unit (3) for the lithium hydroxide aqueous solution; a carbon dioxide gas supply unit (4); a circulation unit (21) for the lithium hydroxide aqueous solution; and a nozzle which is provided at the head of the circulation unit (21) for the lithium hydroxide aqueous solution, and has a diameter which gradually decreases from a base end side to a head side.
    Type: Application
    Filed: June 10, 2019
    Publication date: July 1, 2021
    Inventor: Yukio SAKUMA