Patents by Inventor David E. Ober

David E. Ober 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).

  • Damper control for preventing spread of fire and smoke through an induction mixing box
    Patent number: 4189092
    Abstract: Upon sensing an excessive temperature in a plenum supplying secondary air to a mixing box, a thermostatic element opens a valve to exhaust air from a pneumatic actuator for opening a normally closed secondary air damper. This action permits the damper to close and so prevent flow of secondary air from the plenum into the mixing box. The control may be tested by applying auxiliary heat to the thermostatic element. The control may be made to prevent spread of smoke by making the application of heat to the thermostatic element responsive to a smoke detector.
    Type: Grant
    Filed: January 8, 1979
    Date of Patent: February 19, 1980
    Assignee: Barber-Colman Company
    Inventors: Dale E. Maxson, David E. Ober