Patents by Inventor Qingfeng Wan

Qingfeng Wan 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).

  • Tantalum wire used for anode lead of tantalum capacitor and manufacturing method thereof
    Patent number: 10121597
    Abstract: The present invention relates to a tantalum wire for anode lead of tantalum capacitors, characterized in that the cross section of the tantalum wire is approximate rectangular or regular rectangular. The present invention also relates to a process for manufacturing the tantalum wire, comprising the steps of: providing feedstock tantalum wire; subjecting the feedstock tantalum wire to heat treatment; subjecting the heat treated tantalum wire to surface pretreatment to form an oxide membrane on the surface-pretreated tantalum wire; rolling the surface-pretreated tantalum wire by lubricating with lubricant oil to make the cross section of the rolled tantalum wire being approximate rectangular or regular rectangular; subjecting the tantalum wire to final annealing.
    Type: Grant
    Filed: October 13, 2015
    Date of Patent: November 6, 2018
    Assignee: NINGXIA ORIENT TANTALUM INDUSTRY CO., LTD.
    Inventors: Bing Zhao, Linghui Du, Yongxu Xie, Qingfeng Wan, Huifeng Wang, Guohua Qiu
  • Tantalum Wire Used for Anode Lead of Tantalum Capacitor and Manufacturing Method Thereof
    Publication number: 20160035494
    Abstract: The present invention relates to a tantalum wire for anode lead of tantalum capacitors, characterized in that the cross section of the tantalum wire is approximate rectangular or regular rectangular. The present invention also relates to a process for manufacturing the tantalum wire, comprising the steps of: providing feedstock tantalum wire; subjecting the feedstock tantalum wire to heat treatment; subjecting the heat treated tantalum wire to surface pretreatment to form an oxide membrane on the surface-pretreated tantalum wire; rolling the surface-pretreated tantalum wire by lubricating with lubricant oil to make the cross section of the rolled tantalum wire being approximate rectangular or regular rectangular; subjecting the tantalum wire to final annealing.
    Type: Application
    Filed: October 13, 2015
    Publication date: February 4, 2016
    Inventors: Bing Zhao, Linghui Du, Yongxu Xie, Qingfeng Wan, Huifeng Wang, Guohua Qiu