Patents by Inventor Tetsuhiro Kodani

Tetsuhiro Kodani 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: 20130237677
    Abstract: A vinylidene fluoride homopolymer represented by the formula (4): CF3-(A1)—I??(4) wherein A1 represents a structural unit of vinylidene fluoride homopolymer which includes crystal form I alone or as main component and has a number average degree of polymerization of 5 to 12.
    Type: Application
    Filed: April 30, 2013
    Publication date: September 12, 2013
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takayuki ARAKI, Tetsuhiro KODANI
  • Patent number: 8450439
    Abstract: There is provided a method of forming a thin film of vinylidene fluoride homopolymer having crystal form I which is applicable to various substrates in relatively easy way (coating conditions, application method, etc.), a process for preparing a vinylidene fluoride homopolymer having crystal form I efficiently at high purity, and novel vinylidene fluoride homopolymers which can give a thin film being excellent in ferroelectricity. The method of forming a thin film of vinylidene fluoride homopolymer comprises (i) a step for preparing a green powder product of vinylidene fluoride homopolymer comprising crystal form I alone or as main component by subjecting vinylidene fluoride to radical polymerization in the presence of a bromine compound or iodine compound having 1 to 20 carbon atoms which contains at least one moiety represented by —CRf1Rf2X1, wherein X1. is iodine atom or bromine atom; Rf1. and Rf2.
    Type: Grant
    Filed: December 17, 2009
    Date of Patent: May 28, 2013
    Assignee: Daikin Industries, Ltd.
    Inventors: Takayuki Araki, Tetsuhiro Kodani
  • Publication number: 20130027339
    Abstract: A transparent piezoelectric sheet-with-a-frame includes a transparent piezoelectric sheet and a frame covering a peripheral edge portion of the transparent piezoelectric sheet. The transparent piezoelectric sheet includes one transparent piezoelectric film including an organic polymer, one first transparent plate electrode placed on a first main surface of the transparent piezoelectric film and having a first transparent plate electrode portion, and one second transparent plate electrode placed on a second main surface of the transparent piezoelectric film and having a second transparent plate electrode portion. An outline of the second transparent plate electrode portion is positioned inside an outline of the first transparent plate electrode portion as seen in a plan view. The outline of the first transparent plate electrode portion completely coincides with the frame, and the outline of the second transparent plate electrode portion does not at all coincide with the frame as seen in the plan view.
    Type: Application
    Filed: February 28, 2011
    Publication date: January 31, 2013
    Applicants: IDEAL STAR INC., DAIKIN INDUSTRIES, LTD.
    Inventors: Tetsuhiro Kodani, Yuuki Kuwajima, Eri Mukai, Meiten Koh, Takashi Kanemura, Kenji Omote, Hiroji Ohigashi
  • Publication number: 20130027340
    Abstract: A transparent piezoelectric sheet includes a quadrilateral-shaped transparent piezoelectric film and a first transparent plate electrode. The quadrilateral-shaped transparent piezoelectric film includes an organic polymer. The quadrilateral-shaped transparent piezoelectric film has entire main surfaces that are piezoelectric. The first transparent plate electrode is layered on part of a first main surface of the main surfaces of the transparent piezoelectric film. One to three sides of the four sides of the quadrilateral shape of the transparent piezoelectric film and area(s) of the first main surface adjacent thereto are not covered by the first transparent plate electrode.
    Type: Application
    Filed: February 28, 2011
    Publication date: January 31, 2013
    Applicants: IDEAL STAR INC., DAIKIN INDUSTRIES, LTD.
    Inventors: Tetsuhiro Kodani, Yuuki Kuwajima, Eri Mukai, Takashi Kanemura, Meiten Koh, Kenji Omote, Hiroji Ohigashi
  • Patent number: 7968649
    Abstract: The present invention provides a process for easily preparing a vinylidene fluoride homopolymer comprising an I-form crystal structure at high purity by selecting a solvent, and the process for preparing the vinylidene fluoride homopolymer comprises not less than 70% by mass of I-form crystal structure, which is obtained by dissolving a vinylidene fluoride homopolymer having a number average degree of polymerization of 3 to 20 in a solvent consisting of an organic solvent having a dipole moment of not less than 2.8 alone or comprising the organic solvent in a part, thereafter, evaporating the solvent.
    Type: Grant
    Filed: April 5, 2010
    Date of Patent: June 28, 2011
    Assignee: Daikin Industries Ltd.
    Inventors: Tetsuhiro Kodani, Yuji Imahori
  • Publication number: 20100249324
    Abstract: The present invention provides a process for easily preparing a vinylidene fluoride homopolymer comprising an I-form crystal structure at high purity by selecting a solvent, and the process for preparing the vinylidene fluoride homopolymer comprises not less than 70% by mass of I-form crystal structure, which is obtained by dissolving a vinylidene fluoride homopolymer having a number average degree of polymerization of 3 to 20 in a solvent consisting of an organic solvent having a dipole moment of not less than 2.8 alone or comprising the organic solvent in a part, thereafter, evaporating the solvent.
    Type: Application
    Filed: April 5, 2010
    Publication date: September 30, 2010
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Tetsuhiro KODANI, Yuji Imahori
  • Patent number: 7718229
    Abstract: The present invention provides a process for easily preparing a vinylidene fluoride homopolymer comprising an I-form crystal structure at high purity by selecting a solvent, and the process for preparing the vinylidene fluoride homopolymer comprises not less than 70% by mass of I-form crystal structure, which is obtained by dissolving a vinylidene fluoride homopolymer having a number average degree of polymerization of 3 to 20 in a solvent consisting of an organic solvent having a dipole moment of not less than 2.8 alone or comprising the organic solvent in a part, thereafter, evaporating the solvent.
    Type: Grant
    Filed: July 11, 2005
    Date of Patent: May 18, 2010
    Assignee: Daikin Industries, Ltd.
    Inventors: Tetsuhiro Kodani, Yuji Imahori
  • Publication number: 20100093962
    Abstract: There is provided a method of forming a thin film of vinylidene fluoride homopolymer having crystal form I which is applicable to various substrates in relatively easy way (coating conditions, application method, etc.), a process for preparing a vinylidene fluoride homopolymer having crystal form I efficiently at high purity, and novel vinylidene fluoride homopolymers which can give a thin film being excellent in ferroelectricity.
    Type: Application
    Filed: December 17, 2009
    Publication date: April 15, 2010
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takayuki Araki, Tetsuhiro Kodani
  • Patent number: 7655742
    Abstract: There is provided a method of forming a thin film of vinylidene fluoride homopolymer having crystal form I which is applicable to various substrates in relatively easy way (coating conditions, application method, etc.), a process for preparing a vinylidene fluoride homopolymer having crystal form I efficiently at high purity, and novel vinylidene fluoride homopolymers which can give a thin film being excellent in ferroelectricity.
    Type: Grant
    Filed: September 22, 2005
    Date of Patent: February 2, 2010
    Assignee: Daikin Industries, Ltd.
    Inventors: Takayuki Araki, Tetsuhiro Kodani
  • Publication number: 20090226622
    Abstract: The present invention provides a process for easily preparing a vinylidene fluoride homopolymer comprising an I-form crystal structure at high purity by selecting a solvent, and the process for preparing the vinylidene fluoride homopolymer comprises not less than 70% by mass of I-form crystal structure, which is obtained by dissolving a vinylidene fluoride homopolymer having a number average degree of polymerization of 3 to 20 in a solvent consisting of an organic solvent having a dipole moment of not less than 2.8 alone or comprising the organic solvent in a part, thereafter, evaporating the solvent.
    Type: Application
    Filed: July 11, 2005
    Publication date: September 10, 2009
    Applicant: Daikin Industries, Ltd.
    Inventors: Tetsuhiro Kodani, Yuji Imahori
  • Patent number: 7517548
    Abstract: A method of forming a ferroelectric thin film containing vinylidene fluoride homopolymer, including the steps of (i) preparing a green powder of vinylidene fluoride homopolymer of crystal form I alone or as main component by subjecting vinylidene fluoride to radical polymerization in the presence of a radical polymerization initiator, (ii) forming a thin film on a substrate surface by using vinylidene fluoride homopolymer of crystal form I alone or as main component obtained from the green powder product of vinylidene fluoride homopolymer of I-form crystal structure alone or as main component, and (iii) subjecting the thin film of vinylidene fluoride homopolymer formed in step (ii) above to polarization.
    Type: Grant
    Filed: September 22, 2005
    Date of Patent: April 14, 2009
    Assignee: Daikin Industries, Ltd.
    Inventors: Takayuki Araki, Tetsuhiro Kodani
  • Publication number: 20090072143
    Abstract: There is provided a pyroelectric infrared sensor being capable of changing its shape and having high sensitivity. The sensor comprises the substrate 11 made of a polymer material such as polyimide or polyethylene terephthalate and having flexibility, the layer 13 comprising vinylidene fluoride (VDF), and the flexible electrodes 12 and 14 comprising an Al-deposited film and provided on and under the VDF oligomer layer 13. The pyroelectric infrared sensor of the present invention has flexibility as a whole due to flexibility of each component elements and can be formed into desired shapes. In addition, since a substrate made of a polymer material has heat capacity and heat conductivity lower than those of Si substrates used on conventional pyroelectric infrared sensors, sensitivity of the sensor can be increased.
    Type: Application
    Filed: March 19, 2007
    Publication date: March 19, 2009
    Applicant: Daikin Industries, Ltd
    Inventors: Kenji Ishida, Shuichiro Kuwajima, Kazumi Matsushige, Toshihisa Horiuchi, Arifumi Matsumoto, Tetsuhiro Kodani, Meiten Koh
  • Publication number: 20070231462
    Abstract: There is provided a method of forming a ferroelectric thin film of vinylidene fluoride homopolymer having crystal form I which is applicable to various substrates in relatively easy way (coating conditions, application method, etc.). The method of forming a ferroelectric thin film comprising vinylidene fluoride homopolymer comprises the step (i) for preparing a green powder of vinylidene fluoride homopolymer comprising crystal form I alone or as main component by subjecting vinylidene fluoride to radical polymerization in the presence of a radical polymerization initiator, the step (ii) for forming a thin film on a substrate surface by using vinylidene fluoride homopolymer which comprises crystal form I alone or as main component and is obtained from the green powder product of vinylidene fluoride homopolymer comprising I-form crystal structure alone or as main component, and the step (iii) for subjecting the thin film of vinylidene fluoride homopolymer formed in the step of above (ii) to polarization.
    Type: Application
    Filed: September 22, 2005
    Publication date: October 4, 2007
    Inventors: Takayuki Araki, Tetsuhiro Kodani
  • Publication number: 20070190334
    Abstract: There is provided the method of forming a thin film of vinylidene fluoride homopolymer of I-form crystal structure having functional group at its end which can be applied to various substrates, by relatively easy method (applying conditions, manner, etc.). The method is a method of forming a thin film of vinylidene fluoride homopolymer by applying, on a substrate, a vinylidene fluoride homopolymer which contains, at one end or both ends thereof, a moiety represented by the formula (1): —(R1)n—Y??(1) wherein R1 is a divalent organic group but does not contain a structural unit of the vinylidene fluoride homopolymer; n is 0 or 1; Y is a functional group, and has from 3 to 100 repeat units of vinylidene fluoride, to form a thin film of vinylidene fluoride homopolymer comprising I-form crystal structure alone or as main component.
    Type: Application
    Filed: March 9, 2005
    Publication date: August 16, 2007
    Applicant: DAIKIN INDUSTRIES, LTD.
    Inventors: Takayuki Araki, Tetsuhiro Kodani
  • Patent number: 7163982
    Abstract: There is provided a method of forming a fine pattern by using a practicable fluorine-containing polymer which has a high transparency to exposure light having a short wavelength such as F2 laser and can undergo resolution of a fine pattern.
    Type: Grant
    Filed: August 10, 2004
    Date of Patent: January 16, 2007
    Assignee: Daiki Industries, Ltd.
    Inventors: Takayuki Araki, Tetsuhiro Kodani, Takuji Ishikawa
  • Publication number: 20060014912
    Abstract: There is provided a method of forming a thin film of vinylidene fluoride homopolymer having crystal form I which is applicable to various substrates in relatively easy way (coating conditions, application method, etc.), a process for preparing a vinylidene fluoride homopolymer having crystal form I efficiently at high purity, and novel vinylidene fluoride homopolymers which can give a thin film being excellent in ferroelectricity.
    Type: Application
    Filed: September 22, 2005
    Publication date: January 19, 2006
    Inventors: Takayuki Araki, Tetsuhiro Kodani
  • Publication number: 20050049374
    Abstract: There is provided a method of forming a fine pattern by using a practicable fluorine-containing polymer which has a high transparency to exposure light having a short wavelength such as F2 laser and can undergo resolution of a fine pattern.
    Type: Application
    Filed: August 10, 2004
    Publication date: March 3, 2005
    Inventors: Takayuki Araki, Tetsuhiro Kodani, Takuji Ishikawa