Patents by Inventor Harold C. Sanborn

Harold C. Sanborn 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).

  • Refractory metal coated metal-working dies
    Patent number: 4571983
    Abstract: Metal-working dies which are typically made of steel are provided with substantially enhanced life by receiving a plasma-sprayed refractory metal coating which is subsequently compacted under conditions of minimum shear stress. The number of working cycles which can be obtained from a die before it is necessary to rework the die can be improved by as much as 3500%.
    Type: Grant
    Filed: April 30, 1985
    Date of Patent: February 25, 1986
    Assignee: United Technologies Corporation
    Inventors: Harold C. Sanborn, Frank Carago, John R. Kreeger
  • Method for the manufacture of metal vanes for turbomachinery
    Patent number: 4531270
    Abstract: To make vane airfoils for an axial flow compressor metal strip is first contour rolled to a cross section comprised of two opposing airfoils separated by a center rib, where one of the faces of the strip is kept planar. The rib is used to guide the strip into dies where it is notched and slotted to define individual airfoils. Next, die stamping makes concave the planar surface of each airfoil.
    Type: Grant
    Filed: June 13, 1984
    Date of Patent: July 30, 1985
    Assignee: United Technologies Corporation
    Inventors: James B. Griffith, Harold C. Sanborn
  • Contour forming conical shapes
    Patent number: 4476194
    Abstract: A truncated conical segment is made by the steps of longitudinally welding two pieces of metal, then contour rolling the weldment to preferentially reduce one of the pieces of the weldment more than the other. This provides a skewed trapezoid shape which is then 3-roll formed into a ring having a conical shape. The angle of the cone is a function of the preferential reduction in the second contour rolling step.
    Type: Grant
    Filed: November 10, 1982
    Date of Patent: October 9, 1984
    Assignee: United Technologies Corporation
    Inventors: Harold C. Sanborn, James B. Griffith