Patents by Inventor Wen-An Yeh

Wen-An Yeh 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).

  • Patent number: 5259144
    Abstract: A planetary-type lapping device is used to finish-grind the surface of the valve seat of a safety relief valve and includes a gear housing which confines a gear receiving space. The gear housing has a top end with a rotatable axial shaft which extends upwardly therefrom and a bottom end. A primary gear member is mounted rotatably to the gear housing in the gear receiving space. At least one secondary gear unit is provided in the receiving space and meshes with the primary gear member. Each secondary gear unit is provided with an axle that is mounted rotatably to the gear housing and that has a lower end which extends downwardly through the bottom end of the gear housing. A grinding disc is mounted on the lower end of the axle of each secondary gear unit. Each grinding disc has a lower side formed with a grinding compound.
    Type: Grant
    Filed: August 17, 1992
    Date of Patent: November 9, 1993
    Inventor: Wen-An Yeh