Patents by Inventor Ryuuichi Iwakawa

Ryuuichi Iwakawa 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: 8144397
    Abstract: A laminated sheet for a display screen. The laminated sheet includes a multilayer sheet A including two or more layers with different linear expansion coefficients. The laminated sheet further includes a single sheet B which is a sheet other than the multilayer sheet A. When all sheets are stacked, a viewing-side sheet is convex on an image light source side, and an image light source-side sheet is convex on the viewing side, or the viewing-side sheet and the image light source side-sheet are both convex on the image light source side, and a curvature of the viewing-side sheet is greater than a curvature of the image light source-side sheet.
    Type: Grant
    Filed: June 29, 2007
    Date of Patent: March 27, 2012
    Assignee: KURARAY Co., Ltd.
    Inventor: Ryuuichi Iwakawa
  • Publication number: 20090251774
    Abstract: An object is to provide a laminated sheet for a display screen and a display screen which enable reliable reduction of warping due to temperature changes. An laminated sheet according to this invention is a laminated sheet, in which a plurality of screen sheets are stacked, including: a multilayer sheet A including two or more layers with different linear expansion coefficients; and a single sheet B which is a sheet other than the multilayer sheet A, wherein at least in a temperature range from 10° C. to 30° C., expressions (*1), (*2) and (*3) are satisfied, and, when all sheets are stacked, either (i) or (ii) below applies.
    Type: Application
    Filed: June 29, 2007
    Publication date: October 8, 2009
    Applicant: Kuraray Co., Ltd.
    Inventor: Ryuuichi Iwakawa
  • Patent number: 7387695
    Abstract: The rear projection screen includes a laminated sheet having a multi-layered structure consisting of the n number (n is a natural number of three or above) of layers. In this laminated sheet, a difference in linear expansion coefficients is 5% or more between a layer having the maximum linear expansion coefficient and a layer having the minimum linear expansion coefficient. Further, a difference in elasticity is 10% or more between a layer having the maximum elasticity and a layer having the minimum elasticity. The curvature change rate ? (1/mm° C.) of the laminated sheet with respect to temperature satisfies ?7.0×10?6???7.0×10?6.
    Type: Grant
    Filed: July 9, 2004
    Date of Patent: June 17, 2008
    Assignee: Kuraray Co., Ltd.
    Inventors: Ryuuichi Iwakawa, Kenji Yoneda
  • Publication number: 20050044115
    Abstract: The rear projection screen includes a laminated sheet having a multi-layered structure consisting of the n number (n is a natural number of three or above) of layers. In this laminated sheet, a difference in linear expansion coefficients is 5% or more between a layer having the maximum linear expansion coefficient and a layer having the minimum linear expansion coefficient. Further, a difference in elasticity is 10% or more between a layer having the maximum elasticity and a layer having the minimum elasticity. The curvature change rate ? (1/mm° C.) of the laminated sheet with respect to temperature satisfies ?7.0×10?6???7.0×10?6.
    Type: Application
    Filed: July 9, 2004
    Publication date: February 24, 2005
    Applicant: KURARAY CO., LTD.
    Inventors: Ryuuichi Iwakawa, Kenji Yoneda