Patents by Inventor Donald L. Berg

Donald L. Berg 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: 4084457
    Abstract: A tool for removing embedded screws and the like, having a pair of pivotally connected handles with screw removing heads at the ends thereof. The screw removing heads each have matching opposed clinching edges, including a pair of laterally spaced parallel clinching edges and a clinching edge at the bottom of each head which is perpendicular to the parallel edges and disposed between them. The parallel edges dig into the periphery of the screw head to allow torque to be applied to the screw as the handles are turned by a user, while the perpendicular clinching edges engage the underside of the head of an embedded screw to oppose slipping movement of the tool off the screw head and apply upward force thereto.
    Type: Grant
    Filed: June 29, 1977
    Date of Patent: April 18, 1978
    Inventor: Donald L. Berg