Patents by Inventor Zhao Zhang Dai

Zhao Zhang Dai 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).

  • Free ink writing instrument with nano technology
    Patent number: 6648539
    Abstract: A writing instrument has a housing containing an ink reservoir. The writing instrument further has a writing nib in communication with one (or both) end of the ink reservoir by an ink induction device. In connection with the ink reservoir, there is also at least one set of pressure balance system. The pressure balance system includes a nano hydrophobic venting material that allows air to flow in and out of the reservoir to compensate pressure differential between ambient atmosphere and the interior of the ink reservoir, while prevents ink to flow from the ink reservoir to the atmosphere.
    Type: Grant
    Filed: May 21, 2002
    Date of Patent: November 18, 2003
    Assignee: Toyo Pen International Ltd.
    Inventor: Zhao Zhang Dai
  • Free ink writing instrument with nano technology
    Publication number: 20020172544
    Abstract: A writing instrument has a housing containing an ink reservoir. The writing instrument further has a writing nib in communication with one (or both) end of the ink reservoir by an ink induction device. In connection with the ink reservoir, there is also at least one set of pressure balance system. The pressure balance system includes a nano hydrophobic venting material that allows air to flow in and out of the reservoir to compensate pressure differential between ambient atmosphere and the interior of the ink reservoir, while prevents ink to flow from the ink reservoir to the atmosphere.
    Type: Application
    Filed: May 21, 2002
    Publication date: November 21, 2002
    Inventor: Zhao Zhang Dai