Patents by Inventor Jin Weiguo

Jin Weiguo 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).

  • Device for clamping drill pipe and the like in mouse hole pipe
    Patent number: 4756538
    Abstract: The invention relates to a clamping device used for making up or breaking apart joints of drill pipe, drill collars and the like in mouse hole pipe during oil drilling operation. A clamping means of the device firstly clamps the drill pipe therebetween during its moving down and centripetally simultaneously by the self-weight of drill pipe to be clamped, then tightly clamps the drill pipe with a force generated by rollers' moving inwardly to the center of the device along the concavity of the turning plate with the rotation of a kelly. It can be used instead of a back tong when making-up joint in mouse hole pipe with a tong.
    Type: Grant
    Filed: March 25, 1986
    Date of Patent: July 12, 1988
    Assignee: The Science and Technic Department of Dagang Petroleum Administration
    Inventors: Chen Yuehui, Jin Weiguo