Patents by Inventor Keiji Obayashi

Keiji Obayashi 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).

  • Ink-jet recording sheet
    Patent number: 6861110
    Abstract: An ink-jet recording sheet comprising a reflective support having thereon a porous ink absorbing layer containing a dye or a pigment, wherein a color difference ?abL defined by the following formula is not more than 7: ?abL=[(a1?a2)2+(b1?b2)2+(L1?L2)2]1/2 wherein (L1, a1, b1) and (L2, a2, b2) each are a set of coordinates (L*, a*, b*) defined in a CIELAB color space and measured on a surface of the reflective support adjacent to the ink absorbing layer and on an outermost surface of the ink absorbing layer respectively, and a2 is in a range of ?2 to 2 and b2 is in a range of ?4 to 4.
    Type: Grant
    Filed: January 27, 2003
    Date of Patent: March 1, 2005
    Assignee: Konica Corporation
    Inventors: Keiji Obayashi, Osamu Hatano
  • Ink-jet recording sheet
    Publication number: 20030175450
    Abstract: An ink-jet recording sheet comprising a reflective support having thereon a porous ink absorbing layer containing a dye or a pigment, wherein a color difference &Dgr;abL defined by the following formula is not more than 7:
    Type: Application
    Filed: January 27, 2003
    Publication date: September 18, 2003
    Applicant: KONICA CORPORATION
    Inventors: Keiji Obayashi, Osamu Hatano