Patents by Inventor Kin Keung So

Kin Keung So 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).

  • Process cartridge
    Patent number: 8929773
    Abstract: A process cartridge used in an image forming apparatus, the process cartridge having a photosensitive drum, a developer roller, a conductive electrode and a rectifier. The photosensitive drum and the developer roller are contacted with each other. The conductive electrode is contacted with a power supply electrode in the image forming apparatus to receive a developing bias. The rectifier converts an alternating current bias voltage into a direct current bias voltage. The rectifier is electrically connected between the conductive electrode and the developer roller. A rectifier converting an alternating current bias voltage into a direct current bias voltage is added into a contact process cartridge in the present invention. Therefore, the contact process cartridge can be applied to a printer using a jumping development method.
    Type: Grant
    Filed: March 19, 2010
    Date of Patent: January 6, 2015
    Assignee: Print-Rite • Unicorn Image Products Co., Ltd. of Zhuhai
    Inventor: Kin Keung So
  • Process Cartridge
    Publication number: 20110305482
    Abstract: A process cartridge used in an image forming apparatus, the process cartridge having a photosensitive drum, a developer roller, a conductive electrode and a rectifier. The photosensitive drum and the developer roller are contacted with each other. The conductive electrode is contacted with a power supply electrode in the image forming apparatus to receive a developing bias. The rectifier converts an alternating current bias voltage into a direct current bias voltage. The rectifier is electrically connected between the conductive electrode and the developer roller. A rectifier converting an alternating current bias voltage into a direct current bias voltage is added into a contact process cartridge in the present invention. Therefore, the contact process cartridge can be applied to a printer using a jumping development method.
    Type: Application
    Filed: March 19, 2010
    Publication date: December 15, 2011
    Applicant: PRINT-RITE UNICORN IMAGE PRODUCTS CO., LTD. OF ZHUHAI
    Inventor: Kin Keung So
  • Filament cartridge for 3D printing
    Patent number: D788195
    Type: Grant
    Filed: January 15, 2015
    Date of Patent: May 30, 2017
    Assignee: PRINT-RITE • UNICORN IMAGE PRODUCTS CO., LTD. OF ZHUHAI
    Inventors: Li'an Liu, Daoquan Song, Kin Keung So