Patents by Inventor William C. Isom

William C. Isom 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).

  • Exhaust hood energy saving device
    Patent number: 4105015
    Abstract: The specification discloses an exhaust ventilation system with a vented hood arrangement over a cooking area which is controlled automatically by the presence of a cook at a cooking station. The primary exhaust fan is automatically turned off a predetermined period of time after the cook has left the cooking station. A fresh air fan is similarly controlled by the presence of the cook at the cooking station. An auxiliary exhaust fan is automatically energized and deenergized in response to the operation of the primary exhaust fan, such that the auxiliary fan is on when the primary exhaust fan is off and vice versa.
    Type: Grant
    Filed: March 9, 1977
    Date of Patent: August 8, 1978
    Assignee: William C. Isom
    Inventor: William C. Isom
  • Electric light cart
    Patent number: D335735
    Type: Grant
    Filed: October 21, 1991
    Date of Patent: May 18, 1993
    Inventor: William C. Isom
  • Electric light cart with ladder holder
    Patent number: D335736
    Type: Grant
    Filed: October 21, 1991
    Date of Patent: May 18, 1993
    Inventor: William C. Isom