Patents by Inventor Houlun Li

Houlun Li 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).

  • Power-Off-Protection Type of Safety Control Double Valve Applied to Pressing Machines
    Publication number: 20120174804
    Abstract: This invention covers to a kind of control valve, materially, it is a kind of Power-Off-Protection Type of Safety Control Double Valve applied to Pressing Machine.
    Type: Application
    Filed: September 18, 2010
    Publication date: July 12, 2012
    Inventors: Fang Rong, Zhengfeng Zhang, Ming Lu, Houlun Li, Ming Zhuang