Patents by Inventor Kazutaka Hosokawa

Kazutaka Hosokawa 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: 20210040274
    Abstract: Powder including low molecular weight polytetrafluoroethylene having a melt viscosity of 1×102 to 7×105 Pa·s at 380° C., having a melt viscosity of 1×102 to 7×105 Pa·s at 380° C., having an average particle size of 1.0 to 50 ?m, and containing 30 or more carboxyl groups at ends of the molecule chain per 106 carbon atoms in the main chain, wherein the powder is substantially free from C8-C14 perfluorocarboxylic acids and salts thereof.
    Type: Application
    Filed: October 23, 2020
    Publication date: February 11, 2021
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Ken YOSHIDA, Hirotoshi YOSHIDA, Keisuke HAGI, Masayuki TSUJI, Taketo KATO, Yuuji TANAKA, Taku YAMANAKA, Kazuya KAWAHARA, Masamichi SUKEGAWA, Kazutaka HOSOKAWA
  • Patent number: 10870735
    Abstract: The invention provides a production method for producing low molecular weight polytetrafluoroethylene enabling easy removal of most of C8-C14 perfluorocarboxylic acids and salts thereof, which are unfortunately generated by irradiation, from the low molecular weight polytetrafluoroethylene. The method for producing low molecular weight polytetrafluoroethylene includes: (1) irradiating polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a melt viscosity of 1×102 to 7×105 Pa·s at 380° C.; (2) pulverizing the low molecular weight polytetrafluoroethylene; and (3) heating the low molecular weight polytetrafluoroethylene pulverized in the step (2).
    Type: Grant
    Filed: August 4, 2017
    Date of Patent: December 22, 2020
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Ken Yoshida, Hirotoshi Yoshida, Keisuke Hagi, Masayuki Tsuji, Taketo Kato, Yuuji Tanaka, Taku Yamanaka, Kazuya Kawahara, Masamichi Sukegawa, Kazutaka Hosokawa
  • Patent number: 10793650
    Abstract: Low molecular weight polytetrafluoroethylene powder having a complex viscosity of 1×102 to 7×105 Pa·s at 380° C., containing 5 or less carboxyl groups at ends of the molecule chain per 106 carbon atoms in the main chain, and being substantially free from C8-C14 perfluorocarboxylic acids and salts thereof. Also disclosed is a method for producing low molecular weight polytetrafluoroethylene.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: October 6, 2020
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Ken Yoshida, Hirotoshi Yoshida, Keisuke Hagi, Masayuki Tsuji, Taketo Kato, Yuuji Tanaka, Taku Yamanaka, Kazuya Kawahara, Masamichi Sukegawa, Kazutaka Hosokawa
  • Publication number: 20200123283
    Abstract: Low molecular weight polytetrafluoroethylene powder having a complex viscosity of 1×102 to 7×103 Pa·s at 380° C., containing 5 or less carboxyl groups at ends of the molecule chain per 106 carbon atoms in the main chain, and being substantially free from C8-C14 perfluorocarboxylic acids and salts thereof. Also disclosed is a method for producing low molecular weight polytetrafluoroethylene.
    Type: Application
    Filed: November 26, 2019
    Publication date: April 23, 2020
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Ken YOSHIDA, Hirotoshi Yoshida, Keisuke Hagi, Masayuki Tsuji, Taketo Kato, Yuuji Tanaka, Taku Yamanaka, Kazuya Kawahara, Masamichi Sukegawa, Kazutaka Hosokawa
  • Patent number: 10538605
    Abstract: A method for producing low molecular weight polytetrafluoroethylene less likely to generate C8-C14 perfluorocarboxylic acids and salts thereof. The method includes: (1) feeding into an airtight container: polytetrafluoroethylene; at least one additive selected from the group consisting of hydrocarbons, chlorinated hydrocarbons, alcohols, and carboxylic acids other than C8-C14 perfluorocarboxylic acids; and at least one selected from the group consisting of inert gases other than the above additive and oxygen adsorbents; and (2) irradiating the polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a complex viscosity of 1×102 to 7×105 Pa·s at 380° C.
    Type: Grant
    Filed: August 4, 2017
    Date of Patent: January 21, 2020
    Assignee: DAIKIN INDUSTRIES, LTD.
    Inventors: Ken Yoshida, Hirotoshi Yoshida, Keisuke Hagi, Masayuki Tsuji, Taketo Kato, Yuuji Tanaka, Taku Yamanaka, Kazuya Kawahara, Masamichi Sukegawa, Kazutaka Hosokawa
  • Publication number: 20190023818
    Abstract: The invention provides a method for producing low molecular weight polytetrafluoroethylene less likely to generate C8-C14 perfluorocarboxylic acids and salts thereof. The method for producing low molecular weight polytetrafluoroethylene includes: (1) feeding into an airtight container: polytetrafluoroethylene; at least one additive selected from the group consisting of hydrocarbons, chlorinated hydrocarbons, alcohols, and carboxylic acids other than C8-C14 perfluorocarboxylic acids; and at least one selected from the group consisting of inert gases other than the above additive and oxygen adsorbents; and (2) irradiating the polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a complex viscosity of 1×102 to 7×105 Pa·s at 380° C.
    Type: Application
    Filed: August 4, 2017
    Publication date: January 24, 2019
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Ken YOSHIDA, Hirotoshi YOSHIDA, Keisuke HAGI, Masayuki TSUJI, Taketo KATO, Yuuji TANAKA, Taku YAMANAKA, Kazuya KAWAHARA, Masamichi SUKEGAWA, Kazutaka HOSOKAWA
  • Publication number: 20190023856
    Abstract: The invention provides a production method for producing low molecular weight polytetrafluoroethylene enabling easy removal of most of C8-C14 perfluorocarboxylic acids and salts thereof, which are unfortunately generated by irradiation, from the low molecular weight polytetrafluoroethylene. The method for producing low molecular weight polytetrafluoroethylene includes: (1) irradiating polytetrafluoroethylene to provide low molecular weight polytetrafluoroethylene having a melt viscosity of 1×102 to 7×105 Pa·s at 380° C.; (2) pulverizing the low molecular weight polytetrafluoroethylene; and (3) heating the low molecular weight polytetrafluoroethylene pulverized in the step (2).
    Type: Application
    Filed: August 4, 2017
    Publication date: January 24, 2019
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Ken YOSHIDA, Hirotoshi YOSHIDA, Keisuke HAGI, Masayuki TSUJI, Taketo KATO, Yuuji TANAKA, Taku YAMANAKA, Kazuya KAWAHARA, Masamichi SUKEGAWA, Kazutaka HOSOKAWA
  • Patent number: 8672652
    Abstract: In order to provide a welded structure of and welding method for two metallic parts fitted together at a tubular section in a high-pressure fuel supply pump, an electric current is supplied to any of the welding connection surfaces formed between a pump housing and cylinder in a high-pressure fuel supply pump, between the pump housing and an installation flange, between the pump housing and an intake or discharge joint, between the pump housing and a pulsation-absorbing damper cover, between the pump housing and a relief valve mechanism, and between the pump housing and an electromagnetically driven intake valve mechanism. The two sections are pressed against each other to generate, along the connection surface, a plastic flow not causing melting or fusion due to heat, and form a diffusion-weld region at the connection surface by using the plastic flow and the application of the pressure.
    Type: Grant
    Filed: October 30, 2008
    Date of Patent: March 18, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Akihiro Munakata, Hideki Machimura, Kazutaka Hosokawa
  • Publication number: 20120301309
    Abstract: Dissimilar metal welds including a buttering portion with a small variation in strength distribution in a plate thickness direction are formed by welding two parent materials having at least one of different compositions and different refining conditions through a buttering for alleviating mismatch between one of the different compositions and the different refining conditions of the two members and through a welded metal for joining one of the parent materials and the buttering. The buttering is formed of welding metals laminated in a plate thickness direction, and a dilution ratio of the buttering with the parent materials is 50% or less. The manufacturing method includes performing butt welding on a dummy material formed by increasing a groove depth by providing a member on a bottom side of a welding groove and on parent materials by using the buttering; and processing a groove within a welding metal formed of the buttering.
    Type: Application
    Filed: May 22, 2012
    Publication date: November 29, 2012
    Inventors: Eiji NISHIOKA, Jun SATO, Shinya IMANO, Takeshi KUDO, Kenichi MURATA, Kazutaka HOSOKAWA, Kazuhiko ENDO
  • Publication number: 20090110575
    Abstract: An object of this invention is to provide such a welded structure of and welding method for two metallic parts fitted together at a tubular section in a high-pressure fuel supply pump, that enables rapid joining of both metallic parts by staking (press-fitting included), screw fastening, and/or laser welding, offers high welding strength and sufficient fluid sealability, and keeps the metallic materials free from thermal changes in composition.
    Type: Application
    Filed: October 30, 2008
    Publication date: April 30, 2009
    Applicant: Hitachi, Ltd.
    Inventors: Akihiro MUNAKATA, Hideki Machimura, Kazutaka Hosokawa
  • Patent number: 7367746
    Abstract: There is provided a lifting pole apparatus which can lift and lower a pole having such strength as to be capable of preventing cars from entering. The lifting pole apparatus comprises a cylindrical pole which is capable of lifting and lowering inside a housing case; a screw shaft hanging from a top portion of the pole inwardly; a stay disposed upright on a bottom portion of the housing case, and housed in the pole; a driving gear rotatably supported on the stay, and having a screw portion on a through hole disposed at a center axis thereof, the screw portion being threadably mounted on the screw shaft; at least two motors disposed on the stay for rotating the driving gear; and an electro-magnetic brake disposed on the stay for activating the brake on the rotation of the driving gear.
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: May 6, 2008
    Assignee: Koei Industry Co., Ltd.
    Inventor: Kazutaka Hosokawa
  • Publication number: 20070068078
    Abstract: There is provided a lifting pole apparatus which can lift and lower a pole having such strength as to be capable of preventing cars from entering. The lifting pole apparatus comprises a cylindrical pole which is capable of lifting and lowering inside a housing case; a screw shaft hanging from a top portion of the pole inwardly; a stay disposed upright on a bottom portion of the housing case, and housed in the pole; a driving gear rotatably supported on the stay, and having a screw portion on a through hole disposed at a center axis thereof, the screw portion being threadably mounted on the screw shaft; at least two motors disposed on the stay for rotating the driving gear; and an electro-magnetic brake disposed on the stay for activating the brake on the rotation of the driving gear.
    Type: Application
    Filed: September 28, 2005
    Publication date: March 29, 2007
    Inventor: Kazutaka Hosokawa
  • Publication number: 20060241214
    Abstract: The method for concentrating a fluoropolymer in a fluoropolymer aqueous dispersion includes a step for preparing a fluoropolymer aqueous dispersion, and a step for filtering the fluoropolymer aqueous dispersion in a polymer membrane. The polymer membrane oscillates during the filtration. The method for concentrating a water-soluble, fluorine-containing emulsifier in an aqueous solution containing the water-soluble, fluorine-containing emulsifier includes a step for preparing an aqueous solution containing a water-soluble, fluorine-containing emulsifier, and a step for filtering the aqueous containing the water-soluble, fluorine-containing emulsifier in a polymer membrane. The polymer membrane oscillates during both the filtration steps.
    Type: Application
    Filed: March 1, 2006
    Publication date: October 26, 2006
    Applicant: DAIKIN AMERICA, INC.
    Inventors: Allan Britnell, Marty Simpson, James Conheady, Kazutaka Hosokawa
  • Patent number: 6747108
    Abstract: In the preparation of a modified polytetrafluoroethylene fine powder by polymerizing tetrafluoroethylene in an aqueous medium in the presence of a water soluble fluorine-containing dispersant, a fluoroalkyl vinyl ether is added to a reaction system at latest at a start of a reaction and a copolymerization reaction of the fluoroalkyl vinyl ether with tetrafluoroethylene is initiated, and a chain transfer agent is added to the reaction system after at least 80% of tetrafluoroethylene to be polymerized is consumed. The obtained modified polytetrafluoroethylene fine powder has good molding properties, in particular, extrusion properties, and high heat resistance.
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: June 8, 2004
    Assignee: Daikin Industries, Ltd.
    Inventors: Kazutaka Hosokawa, Tatsuro Uchida, Shinichi Yano, Yoshinori Nanba
  • Patent number: 6531557
    Abstract: A modified polytetrafluoroethylene fine powder containing agglomerates of colloidal particles with an average particle size of from 0.05 to 0.5 &mgr;m which comprise a copolymer of tetrafluoroethylene and an olefin-monomer represented by X(CF2)nOCF═CF2 in which X is a hydrogen atom, a fluorine atom or a chlorine atom, and n is an integer of 1 to 6, and/or C3F7(OCF2CF2CF2)m[OCF(CF3)CF2]pOCF═CF2 in which m and p are independently an integer of 0 to 4, provided that the sum of m and p is not 0 (zero), a content of the olefin monomer being from 0.02 to 0.3 wt. %, wherein the copolymer has a molecular weight distribution Mw/Mn of from 1.5 to 4.5 and a standard specific gravity of from 2.135 to 2.175. This modified polytetrafluoroethylene has good paste extrudability, and provides molded articles having good mechanical properties, in particular, pressure resistance.
    Type: Grant
    Filed: March 12, 1999
    Date of Patent: March 11, 2003
    Assignee: Daikin Industries Ltd.
    Inventors: Kazutaka Hosokawa, Yoshinori Nanba, Takahisa Aoyama, Tetsuo Shimizu
  • Patent number: 6503988
    Abstract: A polytetrafluoroethylene fine powder excellent in powder flowability which comprises fine particles (the primary particle) having a mean particle diameter of 0.05 to 1 &mgr;m, an apparent density of 0.52 to 0.70 g/ml, a standard specific gravity (SSG) of 2.14 to 2.23, and a secondary mean particle diameter of 100 to 1000 &mgr;m, antidripping agent using the above polytetrafluoroethylene fine powder, flame resistive resin composition containing this powder, and composition for inhibiting dust characteristics containing this powder.
    Type: Grant
    Filed: April 23, 1998
    Date of Patent: January 7, 2003
    Assignee: Daikin Industries, Ltd.
    Inventors: Takahiro Kitahara, Kazutaka Hosokawa, Tetsuo Shimizu
  • Patent number: 6136893
    Abstract: To provide the method for concentrating an aqueous dispersion of fluorine-containing polymer particles containing a surfactant, which is applicable to a fluorine-containing polymer such as PTFE being easily fibrilated and assures low energy, low cost and short term concentration only by using various kinds of surfactants in a small amount. The method for concentrating an aqueous dispersion of fluorine-containing polymer particles containing the surfactant by feeding the aqueous dispersion of fluorine-containing polymer particles containing the surfactant in an amount of 2.0 to 8.0% by weight based on a solid content of the fluorine-containing polymer to a micro filtration membrane having a pore size of 0.01 to 1 .mu.m with aqueous dispersion feeding means which does not substantially generate shearing force and then removing an aqueous medium containing the surfactant from the aqueous dispersion.
    Type: Grant
    Filed: October 13, 1998
    Date of Patent: October 24, 2000
    Assignee: Daikin Industries, Ltd.
    Inventors: Masanori Yamashita, Toshiro Miura, Shinji Murakami, Shoji Kawachi, Tadao Hayashi, Kazutaka Hosokawa
  • Patent number: 5792942
    Abstract: The present invention relates to a property determining apparatus for automatically determining in real time, properties of a slurry material such as of a sludge under treatment. The apparatus, being provided with a sampling cylinder 2, a quantitative sampling piston pair comprised of a rear piston 3 and a front piston 4, an air cylinder 5, a measurement tank 8, and a measuring means 10, is connected to a transfer pipe P and the like for a slurry material via a connecting opening 2w of the sampling cylinder 2.
    Type: Grant
    Filed: February 26, 1996
    Date of Patent: August 11, 1998
    Assignee: Koei Industry Co. Ltd.
    Inventor: Kazutaka Hosokawa
  • Patent number: 5641894
    Abstract: A sampling cylinder 3 is attached to a process piping 2 through which a slurry flows. A front piston 9 and a rear piston 10 which slide within the sampling cylinder 3 are driven via a driving rod 12 by a fluid pressure cylinder 11. These two pistons 9,10 are allowed to slide to collect the slurry into a sampling space 30 defined between the pistons 9,10. The front piston 9 is brought closer to the rear piston 10 to reduce the volume of the sampling space 30. Thus, only the filtrate in the slurry is fed through a filter 5 into a filtrate collecting tank 6, where pH etc. of the filtrate is measured by a sensor 8. Subsequently, the front piston 9 is brought apart from the rear piston 10 to increase the volume of the sampling space 30. Thus, the filtrate is returned into the sampling space 30 back-washing the filter 5. Then, the slurry in the sampling space 30 is returned to the process piping 2.
    Type: Grant
    Filed: January 23, 1996
    Date of Patent: June 24, 1997
    Assignee: Koei Industry Co., Ltd.
    Inventor: Kazutaka Hosokawa
  • Patent number: 5324785
    Abstract: Colloidal polytetrafluoroethylene fine particles having an average particle size of 0.05 to 1.0 .mu.m and each comprising a core made of polytetrafluoroethylene which has a high molecular weight and can be fibrilled and a shell surrounding the core and made of a low molecular weight polytetrafluoroethylene which is not fibrilled, which has good dispersibility in water or an organic solvent and easily provides an organosol by a phase transfer method.
    Type: Grant
    Filed: October 8, 1993
    Date of Patent: June 28, 1994
    Assignee: Daikin Industries Ltd.
    Inventors: Yoshihisa Noda, Kazutaka Hosokawa, Toshio Mizuno, Kiyohiko Ihara, Tetsuo Shimizu