Patents by Inventor Dennis M. Grainger

Dennis M. Grainger 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).

  • Self-closing gate
    Patent number: 5138796
    Abstract: A self-closing gate includes a gate assembly (10) with at least one gate section (18) and a rotational mechanism (14). The rotational mechanism (14) includes structure (44) for rotatably mounting the gate section, structure (38) for storing rotational energy as the gate rotates through a predetermined rotational angle, and structure (38) for releasing the energy to cause continued rotation of the gate.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: August 18, 1992
    Inventor: Dennis M. Grainger