Patents Assigned to Pentel Kabushiki Kaisha
  • Ink for ballpoint pens and ballpoint pen using same
    Patent number: 8771410
    Abstract: An ink composition for ballpoint pens comprises a coloring agent, a liquid medium, a polyoxyethylene castor oil and/or a polyoxyethylene hardened castor oil, or a derivative thereof, and one compound or a mixture of two or more compounds selected from the group consisting of a monoalkyl ether phosphoric acid, a polyoxyethylene monoalkyl ether phosphoric acid, a dialkyl ether phosphoric acid, a polyoxyethylene dialkyl ether phosphoric acid, a trialkyl ether phosphoric acid, and a polyoxyethylene trialkyl ether phosphoric acid.
    Type: Grant
    Filed: January 22, 2010
    Date of Patent: July 8, 2014
    Assignee: Pentel Kabushiki Kaisha
    Inventors: Aya Otsubo, Ikuo Takagishi, Kiyonori Yasuike, Hiroki Kimura, Takashi Sekine
  • INK FOR BALLPOINT PENS AND BALLPOINT PEN USING SAME
    Publication number: 20110271870
    Abstract: A ballpoint pen ink ensuring a very soft and smooth writing feel even when a strong writing pressure is applied, is obtained. A ballpoint pen ink containing a colorant, a liquid medium, a polyoxyethylene castor oil and/or a polyoxyethylene hardened castor oil, or a derivative thereof, and one kind or a mixture of two or more kinds selected from a monoalkyl ether phosphoric acid, a polyoxyethylene monoalkyl ether phosphoric acid, a dialkyl ether phosphoric acid, a polyoxyethylene dialkyl ether phosphoric acid, a trialkyl ether phosphoric acid, a polyoxyethylene trialkyl ether phosphoric acid and their neutralization products or solutions.
    Type: Application
    Filed: January 22, 2010
    Publication date: November 10, 2011
    Applicant: Pentel Kabushiki Kaisha
    Inventors: Aya Otsubo, Ikuo Takagishi, Kiyonori Yasuike, Hiroki Kimura, Takashi Sekine
  • Ballpoint pen
    Patent number: D597600
    Type: Grant
    Filed: January 10, 2008
    Date of Patent: August 4, 2009
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Kazuhisa Shimizu
  • Ballpoint pen
    Patent number: D608392
    Type: Grant
    Filed: January 7, 2009
    Date of Patent: January 19, 2010
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Tomoaki Shibata
  • Mechanical pencil
    Patent number: D611535
    Type: Grant
    Filed: November 6, 2008
    Date of Patent: March 9, 2010
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Kazuhisa Shimizu
  • Ballpoint pen
    Patent number: D620524
    Type: Grant
    Filed: February 26, 2009
    Date of Patent: July 27, 2010
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Tomoaki Shibata
  • Ballpoint pen
    Patent number: D629461
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: December 21, 2010
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Tomoaki Shibata
  • Mechanical pencil
    Patent number: D630247
    Type: Grant
    Filed: February 16, 2010
    Date of Patent: January 4, 2011
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Kazuhisa Shimizu
  • Lead case
    Patent number: D641971
    Type: Grant
    Filed: March 16, 2010
    Date of Patent: July 26, 2011
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Tomoaki Shibata
  • Ballpoint pen
    Patent number: D648789
    Type: Grant
    Filed: December 17, 2010
    Date of Patent: November 15, 2011
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Tomoaki Shibata
  • Ballpoint pen
    Patent number: D648790
    Type: Grant
    Filed: April 14, 2010
    Date of Patent: November 15, 2011
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Hidekazu Nakazawa
  • Correction pen
    Patent number: D648798
    Type: Grant
    Filed: January 4, 2011
    Date of Patent: November 15, 2011
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Kazuhisa Shimizu
  • Correction tape transcriber
    Patent number: D648799
    Type: Grant
    Filed: November 24, 2009
    Date of Patent: November 15, 2011
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Kazuhisa Shimizu
  • Mechanical pencil
    Patent number: D652080
    Type: Grant
    Filed: May 16, 2011
    Date of Patent: January 10, 2012
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Tomoaki Shibata
  • Mechanical pencil
    Patent number: D665024
    Type: Grant
    Filed: April 13, 2011
    Date of Patent: August 7, 2012
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Kazuhisa Shimizu
  • Marking pen
    Patent number: D686280
    Type: Grant
    Filed: November 16, 2011
    Date of Patent: July 16, 2013
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Tomoaki Shibata
  • Marking pen
    Patent number: D687098
    Type: Grant
    Filed: November 16, 2011
    Date of Patent: July 30, 2013
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Tomoaki Shibata
  • Mechanical pencil
    Patent number: D698390
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: January 28, 2014
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Kazuhisa Shimizu
  • Ballpoint pen
    Patent number: D710447
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: August 5, 2014
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Tomoaki Shibata
  • Ballpoint pen
    Patent number: D713879
    Type: Grant
    Filed: April 30, 2013
    Date of Patent: September 23, 2014
    Assignee: Pentel Kabushiki Kaisha
    Inventor: Tomoaki Shibata