Patents by Inventor Akira Kitada

Akira Kitada 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: 8363518
    Abstract: A disk drive determines, from eccentric amounts of individual prescribed rotation phases for one round of an optical disk 1, a rotation phase range in which a lens shift amount after tracking pulling-in of an object lens constituting an optical pickup 3 does not exceed a movable range of the object lens in a preset tracking direction, sets the rotation phase range as a tracking pulling-in range, and carries out tracking pulling-in of the optical pickup 3 while the rotation phase of the optical disk 1 is placed within the tracking pulling-in range.
    Type: Grant
    Filed: February 25, 2010
    Date of Patent: January 29, 2013
    Assignee: Mitsubishi Electric Corp.
    Inventors: Hiroshi Hoshino, Akira Kitada
  • Publication number: 20120300604
    Abstract: A disk drive determines, from eccentric amounts of individual prescribed rotation phases for one round of an optical disk 1, a rotation phase range in which a lens shift amount after tracking pulling-in of an object lens constituting an optical pickup 3 does not exceed a movable range of the object lens in a preset tracking direction, sets the rotation phase range as a tracking pulling-in range, and carries out tracking pulling-in of the optical pickup 3 while the rotation phase of the optical disk 1 is placed within the tracking pulling-in range.
    Type: Application
    Filed: February 25, 2010
    Publication date: November 29, 2012
    Inventors: Hiroshi Hoshino, Akira Kitada
  • Patent number: 6486281
    Abstract: A process for preparing a high purity vinylpyrrolidone polymer which dissolves clearly in an organic solvent can be provided. The process for preparing a high purity vinylpyrrolidone polymer, wherein vinylpyrrolidone is polymerized by using a redox initiator comprising an organic peroxide and a sulfite, and thereafter the product is contacted with an anion exchange resin to be purified.
    Type: Grant
    Filed: August 24, 2001
    Date of Patent: November 26, 2002
    Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Akira Kitada, Keiichi Fujise, Itsuko Hamaguchi
  • Publication number: 20020173608
    Abstract: A vinylpyrrolidone polymer which is little colored, gives off a bad smell little, and contains extremely little impurities is provided. The polymerization is performed by adding a water-soluble organic peroxide and a sulfite to a vinylpyrrolidone aqueous solution.
    Type: Application
    Filed: August 3, 2001
    Publication date: November 21, 2002
    Inventors: Akira Kitada, Keiichi Fujise, Itsuko Hamaguchi
  • Patent number: 6465592
    Abstract: A vinylpyrrolidone polymer which is little colored, gives off a bad smell little, and contains extremely little impurities is provided. The polymerization is performed by adding a water-soluble organic peroxide and a sulfite to a vinylpyrrolidone aqueous solution.
    Type: Grant
    Filed: August 3, 2001
    Date of Patent: October 15, 2002
    Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Akira Kitada, Keiichi Fujise, Itsuko Hamaguchi
  • Patent number: 5783628
    Abstract: A modified polyvinyl alcohol is disclosed, which comprises the following structural units (I) and (II) and has a weight average molecular weight of from 3,000 to 400,000: ##STR1## wherein R.sup.1 represents H or CH.sub.3 ; and M.sup.1 represents H, an alkali metal, ammonium, alkylammonium, or alkanolammonium. The modified polyvinyl alcohol may be sulfonated. The modified polyvinyl alcohol is used as a dispersant such as a drilling fluid additive.
    Type: Grant
    Filed: March 7, 1996
    Date of Patent: July 21, 1998
    Assignee: Dai-Ichi Kogyo Seiyaku Co., Ltd.
    Inventors: Akira Yada, Yoshihiro Kawamori, Hiroshi Nishiguchi, Akira Kitada, Yoshiyuki Mori
  • Patent number: 5164224
    Abstract: Disclosed is a radiation image storage panel comprising a support and a compressed phosphor layer provided thereon which contains a phosphor and a binder of which 10 wt. %-100 wt. % content is thermoplastic elastomer. Further disclosed is a radiographic intensifying screen having the same structure as the above radiation image storage panel. The processes for preparation of the radiation image storage panel and the radiographic intensifying screen are also disclosed.
    Type: Grant
    Filed: April 18, 1990
    Date of Patent: November 17, 1992
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yasushi Kojima, Katsuhiro Kohda, Hiroshi Matsumoto, Akira Kitada, Kikuo Yamazaki
  • Patent number: 5153078
    Abstract: Disclosed in a radiation image storage panel comprising a support and a compressed phosphor layer provided thereon which contains a phosphor and a binder of which 10 wt. %-100 wt. % content is thermoplastic elastomer. Further disclosed is a radiographic intensifying screen having the same structure as the above radiation image storage panel. The processes for preparation of the radiation image storage panel and the radiographic intensifying screen are also disclosed.
    Type: Grant
    Filed: May 6, 1991
    Date of Patent: October 6, 1992
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yasushi Kojima, Katsuhiro Kohda, Hiroshi Matsumoto, Akira Kitada, Kikuo Yamazaki
  • Patent number: 4952813
    Abstract: A radiographic intensifying screen comprising a support and a phosphor-containing resin layer provided thereon, in which the void ratio of said phosphor-containing resin layer is reduced in comparison with an ordinarily prepared phosphor-containing resin layer having the same binder-phosphor ratio and formed by a coating procedure conducted under an atmospheric pressure.The void ratio is not more than 85% of the void ratio of the ordinarily prepared phosphor-containing resin layer for a phosphor-containing resin layer which contains a resinous binder and a phosphor in a weight ratio of 1:1 to 1:25, the ratio of 1:25 being exclusive, and the void ratio is not more than 90% for a phosphor-containing resin layer which contains a resinuous binder and a phosphor in a weight ratio of 1:25 to 1:100.
    Type: Grant
    Filed: June 13, 1988
    Date of Patent: August 28, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Junji Miyahara, Akira Kitada
  • Patent number: 4943727
    Abstract: An improvement of a radiographic intensifying screen comprising a support, a phosphor layer which comprises a binder and a phosphor dispersed therein and a protective film, superposed in order, comprises a metal film on one or both surfaces of said protective film.
    Type: Grant
    Filed: January 21, 1988
    Date of Patent: July 24, 1990
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Akira Kitada, Kikuo Yamazaki, Terumi Matsuda, Jun Kawagoe
  • Patent number: 4855191
    Abstract: Radiation image converting materials such as a radiation image storage panel and a radiographic intensifying screen comprising a support and a phosphor layer provided on the support which comprises a binder and a phosphor dispersed therein are provided with an electrically conductive polymer layer.
    Type: Grant
    Filed: October 20, 1987
    Date of Patent: August 8, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Satoshi Arakawa, Akira Kitada, Kikuo Yamazaki, Kenji Ohmiya, Jun Kawagoe
  • Patent number: 4835396
    Abstract: An improvement of a radiographic intensifying screen comprises a support and a phosphor layer provided on the support, in which phosphor particles are arranged in the phosphor layer in such manner that the diameters of the phosphor particles become larger along the depth direction of from the screen surface side to the support side. A radiation image producing method utilizes a screen-film system comprising a radiographic film and a radiographic intensifying screen provided on one side of the film or a screen-film system comprising a radiographic film and two radiographic intensifying screens provided on both sides of the film, in each of which the phosphor layer has the above-mentioned specific particle diameter distribution.
    Type: Grant
    Filed: January 21, 1988
    Date of Patent: May 30, 1989
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Akira Kitada, Nobuyuki Iwasaki
  • Patent number: 4789785
    Abstract: A radiation image converting material comprising a support, a light-reflecting layer which comprises a binder and a light-reflecting material dispersed therein, and a phosphor layer which comprises a binder and a phosphor dispersed therein, superposed in this order, which is characterized in that said light-reflecting layer contains polymer particles of hollow structure as the light-reflecting material. A radiographic intensifying screen containing a phosphor which gives spontaneous emission and a radiation image storage panel containing a stimulable phosphor which gives stimulated emission are disclosed.
    Type: Grant
    Filed: December 11, 1986
    Date of Patent: December 6, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Kikuo Yamazaki, Akira Kitada
  • Patent number: 4733089
    Abstract: A radiographic intensifying screen comprising a support and at least one phosphor layer comprising a binder and a phosphor dispersed therein. The sharpness of image provided by the screen and the adhesion between the phosphor layer and the support are both remarkably improved by providing onto the surface of the support a great number of pits having a mean depth of at least 1 .mu.m, a maximum depth of more than 1 ranging to 50 .mu.m, and a mean diameter at the opening of at least 1 .mu.m.
    Type: Grant
    Filed: January 27, 1986
    Date of Patent: March 22, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Akira Kitada, Terumi Matsuda
  • Patent number: 4728583
    Abstract: A radiation image storage panel comprising a support and a phosphor layer provided thereon which comprises a binder and a stimulable phosphor dispersed therein, characterized in that said phosphor layer consists essentially of one part on the support side which contains the stimulable phosphor and the other part on the panel surface side which does not substantially contain the stimulable phosphor. Processes for the preparation of said radiation image storage panel are also disclosed.
    Type: Grant
    Filed: August 30, 1985
    Date of Patent: March 1, 1988
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Hisashi Yamazaki, Akira Kitada, Kikuo Yamazaki
  • Patent number: 4704538
    Abstract: A radiographic intensifying screen comprising a support, phosphor layers provided thereon which comprise a binder and phosphor particles dispersed therein, and a protective film provided on said phosphor layers, in which said phosphor layers comprise: (i) the first phosphor layer provided on said support containing at least one terbium activated rare earth oxysulfide phosphor; and (ii) the second phosphor layer provided on the first phosphor layer containing at least one divalent europium activated barium fluorohalide phosphor.
    Type: Grant
    Filed: April 21, 1986
    Date of Patent: November 3, 1987
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Akira Kitada
  • Patent number: 4618778
    Abstract: A radiographic intensifying screen comprising a support, a phosphor layer which comprises a binder and a phosphor dispersed therein, and a light-reflecting layer provided between the support and the phosphor layer which contains a white pigment, characterized in that said white pigment comprises alkaline earth metal fluorohalide represented by the formula M.sup.II FX, in which M.sup.II is at least one alkaline earth metal selected from the group consisting of Ba, Sr and Ca; and X is at least one halogen selected from the group consisting of Cl and Br.
    Type: Grant
    Filed: June 6, 1984
    Date of Patent: October 21, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Akira Kitada
  • Patent number: 4604525
    Abstract: In a radiation image storage panel comprising a support and a phosphor layer which comprises a binder and a stimulable phosphor dispersed therein and is colored with a colorant, the improvement which comprises said colorant is a pigment capable of absorbing a portion of stimulating rays for the stimulable phosphor and said phosphor layer contains a dispersing agent of at least one fatty acid ester selected from the group consisting of sorbitan fatty acid esters, polyoxyethylene sorbitan fatty acid esters and polyoxyethylene fatty acid esters.
    Type: Grant
    Filed: July 2, 1985
    Date of Patent: August 5, 1986
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Akira Kitada, Kikuo Yamazaki, Hisashi Yamazaki
  • Patent number: 4501796
    Abstract: A radiographic intensifying screen comprising a support and at least one phosphor layer provided thereonto which comprises a binder and a phosphor dispersed therein, wherein the support is a resin film containing a white pigment.
    Type: Grant
    Filed: July 6, 1983
    Date of Patent: February 26, 1985
    Assignee: Fuji Photo Film Co., Ltd.
    Inventor: Akira Kitada
  • Patent number: 4455323
    Abstract: A process for the preparation of a radiographic intensifying screen comprising a support and a phosphor layer, which comprises:preparing a coating dispersion containing phosphor particles, a particulate hydrophobic silica in an amount of not more than 2% by weight of the phosphor particles, and a binder; andapplying the coating dispersion onto the support to form a phosphor layer.
    Type: Grant
    Filed: June 21, 1983
    Date of Patent: June 19, 1984
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Akio Ishizuka, Akira Kitada