Patents by Inventor Yoshiyuki Oka

Yoshiyuki Oka 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: 11976648
    Abstract: Even when abnormal heat generation occurs during operation in a state where the temperature of a compressor is not increased, abnormality cannot be detected. A fluid machine includes a fluid machine body; a motor that drives the fluid machine body; a temperature sensor that measures a temperature of the fluid machine body; and a control unit that controls the fluid machine body. The control unit changes a temperature threshold value based on at least one of a pressure of a fluid discharged by the fluid machine body and a frequency of a voltage input into the motor, and issues a notification when the temperature of the compressor body measured by the temperature sensor exceeds the temperature threshold value.
    Type: Grant
    Filed: November 28, 2019
    Date of Patent: May 7, 2024
    Assignee: Hitachi Industrial Equipment Systems Co., Ltd.
    Inventors: Akihiro Yamamoto, Yoshiyuki Kanemoto, Daichi Oka
  • Patent number: 11937410
    Abstract: A package-type fluid machine includes a compressor unit including a compression portion that compresses a fluid, a motor that drives the compression portion, and a cooling fan that is driven by the motor; a machine chamber in which the compressor unit is disposed; an inverter chamber which is adjacent to the machine chamber and in which an inverter is disposed; a partition wall that partitions off the machine chamber from the inverter chamber and has an opening; and an inverter intake port that is disposed in the inverter chamber to take in a cooling gas. The cooling fan is disposed on a side of the machine chamber, the opening being located on the side. The cooling fan is driven to cause the cooling gas to flow from the inverter intake port to the opening to cool the inverter.
    Type: Grant
    Filed: September 13, 2018
    Date of Patent: March 19, 2024
    Assignee: Hitachi Industrial Equipment Systems Co., Ltd.
    Inventors: Fuminori Kato, Yoshiyuki Kanemoto, Hiroaki Saito, Daichi Oka, Akihiro Yamamoto
  • Publication number: 20230151171
    Abstract: A polyolefin resin foam sheet includes a resin mixture as a base resin, the resin mixture including 0% by mass or more and 30% by mass or less of polyethylene resin, 30% by mass or more and 80% by mass or less of polypropylene resin, and 20% by mass or more and 40% by mass or less of a polyolefin elastomer, the polyolefin resin foam sheet fulfilling a range of ?35% or more and 0% or less for dimensional changes in machine and transverse directions under heating for 10 minutes at a temperature 20° C. higher than a maximum melting point that is a highest melting peak in a differential scanning calorimetry.
    Type: Application
    Filed: April 23, 2021
    Publication date: May 18, 2023
    Inventors: Hirotaka Kondo, Yoshiyuki Oka
  • Publication number: 20220169818
    Abstract: A polyolefin-based resin foamed sheet includes a polyolefin-based resin, wherein a thickness of the foamed sheet is 0.05-0.5 mm, a 25% compression hardness defined in JIS K6767(1999) is 20-100 kPa, a ratio of cell sizes in longitudinal and thickness directions is 9-30, a ratio of cell sizes in width and thickness directions is 9-30, and an average cell film thickness in the thickness direction of the foamed sheet is 2-7 ?m.
    Type: Application
    Filed: March 5, 2020
    Publication date: June 2, 2022
    Inventors: Hiroshi Ishida, Hideo Yogou, Tadafumi Akiyama, Yoshiyuki Oka
  • Publication number: 20220145033
    Abstract: A polyolefin-based resin foamed sheet includes a polyolefin-based resin, wherein a thickness of the foamed sheet is 0.05-0.5 mm, an apparent density is 200-500 kg/m3, a tensile strength at 100% elongation in at least one direction of a longitudinal direction (MD direction) and a width direction (TD direction) of the sheet is 3.5-12 MPa, and a ratio of a tensile breakage strength and the tensile strength at 100% elongation in at least one direction of the MD direction and the TD direction of the sheet is 1.0-1.8.
    Type: Application
    Filed: March 5, 2020
    Publication date: May 12, 2022
    Inventors: Hideo Yogou, Hiroshi Ishida, Tadafumi Akiyama, Yoshiyuki Oka
  • Publication number: 20100120932
    Abstract: A polylactic acid foam of beautiful appearance excelling in heat resistance and having satisfactory mechanical properties is provided from polylactic acid and a polyolefin resin and further a vinyl-carboxylate-modified polyolefin resin. The polylactic acid foam is characterized in that not only 1 to 80 parts by weight of polylactic acid but also vinyl-carboxylate-modified polyolefin is contained in 100 parts by weight of polyolefin resin containing 50 wt. % or more of polypropylene resin.
    Type: Application
    Filed: March 25, 2008
    Publication date: May 13, 2010
    Applicant: TORAY INDUSTRIES, INC.
    Inventors: Takahide Yoshioka, Masahiko Ohyama, Yoshiyuki Oka
  • Publication number: 20090324901
    Abstract: The interior material article for an automobile of the present invention comprises sequentially a skin layer (A), a crosslinked foam layer (B) and a base layer (C), and is composed of an integrated combination of a laminated sheet in which the skin layer (A) and the crosslinked foam layer (B) are joined and the base layer (C) by vacuum molding method. The skin layer (A) comprises a polyolefin-based resin (a1), and the crosslinked foam layer (B) is a layer in which a crosslinking and foaming resin composition is crosslinked and foamed, the composition comprising a polylactic acid-based resin (b1), a polyolefin-based resin (b2) comprising a monomer unit based on ethylene and a monomer unit based on propylene, a modified polyolefin (b3) having an ester bond at its side chain, and a crosslinking aid (b4).
    Type: Application
    Filed: June 23, 2009
    Publication date: December 31, 2009
    Applicants: TOYOTA BOSHOKU KABUSHIKI KAISHA, TORAY INDUSTRIES, INC.
    Inventors: Masanori HASHIBA, Takahide YOSHIOKA, Yoshiyuki OKA
  • Publication number: 20090270524
    Abstract: The invention relates to polylactic acid foam comprising a resin composition that comprises polylactic acid (A), polyolefin resin (B) and a polyolefin resin copolymer (C) wherein the weight ratio of the polylactic acid to the sum of the polyolefin resin and polyolefin resin copolymer in the resin composition, (A)/{(B)+(C)}, is in the range of 0.2-6. The polylactic acid foam used is low in the load in global environment and high in heat resistance, moldability and compression strain recovery, and this polylactic acid foam can be applied to a wide variety of uses where polyolefin resin foam has been used conventionally, including interior members of vehicles, heat insulator, cushioning medium, packing material, base of pressure sensitive adhesive tapes, and joint filler for tiles.
    Type: Application
    Filed: March 20, 2006
    Publication date: October 29, 2009
    Applicant: TORAY INDUSTRIES, INC.
    Inventors: Yoshiyuki Oka, Takahide Yoshioka, Masahiko Oyama
  • Publication number: 20090023826
    Abstract: The present invention provides a crosslinked polyolefin resin foam which is excellent in heat resistance, and also can be secondarily processed into a complicated shape. The crosslinked polyolefin resin foam includes a polyolefin resin composition containing 20 to 50% by weight of a polypropylene-based resin (A) which shows at least one endothermic peak measured by differential scanning calorimeter at a temperature of 160° C. or higher, 20 to 50% by weight of a polypropylene-based resin (B) which shows an endothermic peak measured by differential scanning calorimeter at a temperature of lower than 160° C., and 20 to 40% by weight of a polyethylene-based resin (c), and can be obtained by forming the polyolefin resin composition into an optional form and foaming and crosslinking the resin.
    Type: Application
    Filed: May 11, 2006
    Publication date: January 22, 2009
    Applicant: TORAY INDUSTRIES, INC.
    Inventors: Keisuke Nishimura, Masahiko Oyama, Yoshiyuki Oka, Fusayoshi Akimaru
  • Patent number: 7265160
    Abstract: The foam sheet of the present invention is biodegradable, can be recycled, has good processability, is lightweight, exhibits excellent appearance, has practically satisfactory heat resistance and is more acceptable to the environment. There is provided a crosslinked biodegradable resin continuous foam sheet comprising biodegradable resin, and has an expansion rate of about 1.5 to about 50 and a gel fraction of about 3% or more. There is further provided a method for producing the foam sheet comprising the steps of: (1) preparing a sheet from a resin composition comprising a biodegradable resin, a thermal decomposable blowing agent, and a crosslinking promoter; (2) irradiating the resulting sheet with an ionizing radiation to crosslink the resin composition; and (3) subjecting the crosslinked sheet to heat treatment to continuously prepare a crosslinked foam sheet.
    Type: Grant
    Filed: November 27, 2002
    Date of Patent: September 4, 2007
    Assignee: Toray Industries, Inc.
    Inventors: Yoshiyuki Oka, Jun Goto, Fusayoshi Akimaru, Noriaki Tsukada, Junichi Tainaka
  • Publication number: 20050032923
    Abstract: The foam sheet of the present invention is biodegradable, can be recycled, has good processability, is lightweight, exhibits excellent appearance, has practically satisfactory heat resistance and is more acceptable to the environment. There is provided a crosslinked biodegradable resin continuous foam sheet comprising biodegradable resin, and has an expansion rate of about 1.5 to about 50 and a gel fraction of about 3% or more. There is further provided a method for producing the foam sheet comprising the steps of: (1) preparing a sheet from a resin composition comprising a biodegradable resin, a thermal decomposable blowing agent, and a crosslinking promoter; (2) irradiating the resulting sheet with an ionizing radiation to crosslink the resin composition; and (3) subjecting the crosslinked sheet to heat treatment to continuously prepare a crosslinked foam sheet.
    Type: Application
    Filed: November 27, 2002
    Publication date: February 10, 2005
    Applicant: Toray Industries, Inc.
    Inventors: Yoshiyuki Oka, Jun Goto, Fusayoshi Akimaru, Noriaki Tsukada, Junichi Tainaka
  • Patent number: 5401086
    Abstract: An antilocking brake fluid pressure control unit for a vehicle includes a fluid pressure control device which receives an antilocking operation signal for controlling the pressure applied to a wheel brake. A pump in a parallel flow circuit returns a brake working fluid. A damping chamber (13) is connected to a fluid passage (9) between an outlet port of the pump and a feedback point (15). A filter is provided in the fluid passage (9) between the damping chamber (13) and the feedback point (15). Due to this structure, air bleeding from a brake piping system is simplified when assembling the brake system in a vehicle, and the time needed for charging a working fluid into the brake system is reduced.
    Type: Grant
    Filed: January 21, 1994
    Date of Patent: March 28, 1995
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Makoto Nishikimi, Yoshiyuki Oka
  • Patent number: 5006176
    Abstract: The present invention relates to a coagulant for soil and/or sand and method for preventing washout using the same. The coagulant comprises approximately 10 parts by weight of carboxymethylcellulose, approximately 10 parts by weight of calcium chloride, approximately 10 parts by weight of sodium metasilicate powder, 0.3 to 100 parts by weight of silicon dioxide and 1 to 300 parts by weight of calcium carbonate. The method for preventing washout comprises the steps of scattering the coagulant over the surface of the soil and/or sand in a manner such that 360 to 1000 g of the coagulant is applied to a volume of surface area of 1 m.sup.2 and a depth of 10 cm, and excavating the soil and/or sand to a depth of 5 to 20 cm and mixing the coagulant and the soil and/or sand while adjusting water content of the soil and/or sand in the range of 30 to 45%. In the method, a part of --OH of cellulose in carboxymethylcellulose is denatured into --OCH.sub.3 which is soluble in water and highly adhesive.
    Type: Grant
    Filed: March 27, 1990
    Date of Patent: April 9, 1991
    Assignees: Shiro Sejima, Yoshiyuki Oka, Ken Murata
    Inventor: Yoshiyuki Oka