Patents by Inventor Robert H. Mellen, Sr.

Robert H. Mellen, Sr. 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).

  • Thermal distortion free viewing of a heated cavity
    Patent number: 4931624
    Abstract: High temperature furnaces are described containing a movable viewing window that is heated so that the work charge can be scanned along the length of the furnace without creating a thermal disturbance. A system is also disclosed for controlling the operation of the furnace based on comparison of viewed images with stored sample images.
    Type: Grant
    Filed: April 17, 1989
    Date of Patent: June 5, 1990
    Inventor: Robert H. Mellen, Sr.
  • Thermal distortion free viewing of a heated cavity
    Patent number: 4833303
    Abstract: High temperature furnaces are described containing a movable viewing window that is heated so that the work charge can be scanned along the length of the furnace without creating a thermal disturbance. A system is also disclosed for controlling the operation of the furnace based on comparison of viewed images with stored sample images.
    Type: Grant
    Filed: July 10, 1987
    Date of Patent: May 23, 1989
    Inventor: Robert H. Mellen, Sr.
  • Method of providing a dynamic temperature gradient
    Patent number: 4518351
    Abstract: A furnace and method producing a precisely controlled temperature gradient within a central bore by a plurality of heating elements sandwiched between respective insulating layers with each heating element loosely thermally coupled to a thermally conductive ring extending concentrically outward from the furnace bore. Thermal sensors at each layer provide data to data processing equipment which controls and moves temperature gradients within the furnace by program.
    Type: Grant
    Filed: September 22, 1983
    Date of Patent: May 21, 1985
    Inventor: Robert H. Mellen, Sr.
  • Dynamic gradient furnace with controlled heat dissipation
    Patent number: 4423516
    Abstract: A furnace producing a precisely controlled temperature gradient within a central bore by a plurality of heating elements sandwiched between respective insulating layers with each heating element loosely thermally coupled to a thermally conductive ring extending concentrically outward from the furnace bore. Thermal sensors at each layer provide data to data processing equipment which controls and moves temperature gradients within the furnace by program.
    Type: Grant
    Filed: March 22, 1982
    Date of Patent: December 27, 1983
    Inventor: Robert H. Mellen, Sr.
  • Dynamic gradient furnace and method
    Patent number: 4086424
    Abstract: A dynamic gradient furnace in which a plurality of heating zones along an axis of the furnace are controlled sequentially to provide a moving temperature gradient profile through the heating chamber of the furnace.
    Type: Grant
    Filed: March 31, 1977
    Date of Patent: April 25, 1978
    Inventor: Robert H. Mellen, Sr.