Patents by Inventor Shigeo Oka

Shigeo Oka 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).

  • Container for lead refill
    Patent number: 6179124
    Abstract: A spare lead storage case comprising a body having a top plate portion in an upper portion thereof and a lid portion attached to the boy, the lid portion including a lead expelling portion having a spare lead passage formed therein and a link mechanism having a control portion, the lead expelling portion and the link mechanism being disposed in a space above the top plate portion, the lead expelling portion being connected to a side wall of the body through a movable portion, the link mechanism being connected to the lead expelling portion through a movable portion, the lead expelling portion being brought into an upstanding state by moving the control portion, thereby allowing the spare lead passage of the lead expelling portion to communicate with an interior of the body.
    Type: Grant
    Filed: December 8, 1999
    Date of Patent: January 30, 2001
    Assignee: Pentel K.K.
    Inventors: Shigeo Oka, Kazunari Takahashi
  • Case for refillable leads for a mechanical pencil
    Patent number: D449073
    Type: Grant
    Filed: January 5, 1999
    Date of Patent: October 9, 2001
    Assignee: Pentel Kabushiki Kaisha
    Inventors: Shigeo Oka, Kazunari Takahashi
  • Clip for a writing instrument
    Patent number: D455179
    Type: Grant
    Filed: April 11, 2001
    Date of Patent: April 2, 2002
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Shigeo Oka
  • Correction pen
    Patent number: D456844
    Type: Grant
    Filed: February 18, 2000
    Date of Patent: May 7, 2002
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Shigeo Oka
  • Ball point pen
    Patent number: D458965
    Type: Grant
    Filed: August 31, 2000
    Date of Patent: June 18, 2002
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Shigeo Oka
  • Ballpoint pen cap
    Patent number: D458966
    Type: Grant
    Filed: November 21, 2001
    Date of Patent: June 18, 2002
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Shigeo Oka
  • Cap for a writing instrument
    Patent number: D459757
    Type: Grant
    Filed: November 21, 2001
    Date of Patent: July 2, 2002
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Shigeo Oka
  • Cap for a writing instrument
    Patent number: D460114
    Type: Grant
    Filed: November 21, 2001
    Date of Patent: July 9, 2002
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Shigeo Oka
  • Cap for a writing instrument
    Patent number: D460486
    Type: Grant
    Filed: November 21, 2001
    Date of Patent: July 16, 2002
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Shigeo Oka
  • Marking pen
    Patent number: D547801
    Type: Grant
    Filed: February 25, 2005
    Date of Patent: July 31, 2007
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Shigeo Oka
  • Mechanical pencil
    Patent number: D572756
    Type: Grant
    Filed: February 13, 2007
    Date of Patent: July 8, 2008
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Shigeo Oka
  • Ball point pen
    Patent number: D490105
    Type: Grant
    Filed: September 17, 2002
    Date of Patent: May 18, 2004
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Shigeo Oka
  • Marking pen
    Patent number: D492722
    Type: Grant
    Filed: October 9, 2003
    Date of Patent: July 6, 2004
    Assignee: Pentel Kabushi Kaisha
    Inventor: Shigeo Oka
  • Cap for a writing instrument
    Patent number: D584357
    Type: Grant
    Filed: September 27, 2007
    Date of Patent: January 6, 2009
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Shigeo Oka
  • Ball point pen
    Patent number: D499139
    Type: Grant
    Filed: March 28, 2003
    Date of Patent: November 30, 2004
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Shigeo Oka
  • Ballpoint pen
    Patent number: D593606
    Type: Grant
    Filed: January 10, 2008
    Date of Patent: June 2, 2009
    Assignee: Pentel Kabushiki Kausha
    Inventors: Shigeo Oka, Rika Tezuchi, Etsuyo Yamada
  • Ballpoint pen
    Patent number: D594060
    Type: Grant
    Filed: January 10, 2008
    Date of Patent: June 9, 2009
    Assignee: Pentel Kabushiki Kaiska
    Inventors: Hideo Uchida, Shigeo Oka
  • Ball point pen
    Patent number: D390873
    Type: Grant
    Filed: December 30, 1996
    Date of Patent: February 17, 1998
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Shigeo Oka
  • Ball point pen
    Patent number: D421625
    Type: Grant
    Filed: March 16, 1999
    Date of Patent: March 14, 2000
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Shigeo Oka
  • Correction pen
    Patent number: D428441
    Type: Grant
    Filed: October 28, 1999
    Date of Patent: July 18, 2000
    Assignee: Pentel Kabushiki Kaisha
    Inventors: Toshihiro Isobe, Shigeo Oka