Patents by Inventor Keizo Kumano

Keizo Kumano 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).

  • Watch case
    Patent number: D596509
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: July 21, 2009
    Assignee: Seiko Watch Kabushiki Kaisha
    Inventors: Katsunori Kume, Keizo Kumano
  • Portion of a watch dial
    Patent number: D604653
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: November 24, 2009
    Assignee: Seiko Watch Kabushiki Kaisha
    Inventors: Katsunori Kume, Keizo Kumano
  • Wristwatch
    Patent number: D333989
    Type: Grant
    Filed: September 21, 1990
    Date of Patent: March 16, 1993
    Assignee: Seiko Instruments Inc.
    Inventors: Kenichi Sugibayashi, Keizo Kumano
  • Wrist watch case with strap
    Patent number: D654814
    Type: Grant
    Filed: September 2, 2011
    Date of Patent: February 28, 2012
    Assignee: Seiko Instruments Inc.
    Inventors: Keizo Kumano, Kengo Nishiyama
  • Wrist watch case with strap
    Patent number: D654815
    Type: Grant
    Filed: September 2, 2011
    Date of Patent: February 28, 2012
    Assignee: Seiko Instruments Inc.
    Inventors: Keizo Kumano, Kengo Nishiyama
  • Wristwatch
    Patent number: D407030
    Type: Grant
    Filed: January 30, 1998
    Date of Patent: March 23, 1999
    Assignee: Seiko Epson Corporation
    Inventors: Hitoshi Toyoshima, Keizo Kumano