Patents by Inventor Weifeng Yan

Weifeng Yan 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).

  • Portable rechargeable batteries
    Patent number: D504393
    Type: Grant
    Filed: December 17, 2003
    Date of Patent: April 26, 2005
    Assignee: Ningbo Lanbao Electric Appliance Co., LTD
    Inventor: Weifeng Yan
  • LED light
    Patent number: D561372
    Type: Grant
    Filed: August 10, 2005
    Date of Patent: February 5, 2008
    Inventor: Weifeng Yan
  • LED light
    Patent number: D561373
    Type: Grant
    Filed: August 10, 2005
    Date of Patent: February 5, 2008
    Inventor: Weifeng Yan