Patents by Inventor Calvin F. Mathis

Calvin F. Mathis 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).

  • Obstruction sensing system for a gate
    Patent number: 6209262
    Abstract: A sensing system for a gate to protect persons and equipment from impact damage by actuating a gate operating system when the end of the gate comes in contact with an obstruction. The force required to actuate the device varies between 3 and 5 pounds. Once the force is applied to the edge of the gate, the gate opening or closing operation will either stop or reverse depending on the specific safety requirements of the gate installation. The force can be applied to any available direction and the system will be activated.
    Type: Grant
    Filed: January 27, 2000
    Date of Patent: April 3, 2001
    Inventor: Calvin F. Mathis