Patents by Inventor John T. Mayhew

John T. Mayhew 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).

  • Continuous metallic strip hot-dip metal coating apparatus
    Patent number: 3998182
    Abstract: Continuous metallic strip hot dip metal coating apparatus in which streams of gas under pressure are impinged against opposite faces of a continuous metallic strip emerging from a molten coating metal bath to thereby control the final coating weight on the strip, there being provided means for giving an indication corresponding to the final coating weight on the metal strip in combination with means responsive to such indication for controlling the impingement effect of the streams of gas under pressure to thereby obtain a desired final coating weight on the metal strip.
    Type: Grant
    Filed: October 17, 1975
    Date of Patent: December 21, 1976
    Assignee: National Steel Corporation
    Inventor: John T. Mayhew
  • Product and process
    Patent number: 3977842
    Abstract: Steel strip at around 1000.degree.F. or higher is run into a galvanizing pot maintained at a higher than conventional temperature to cause alloying of the iron with the spelter on the surfaces of the strip, the strip being passed through a zone of cooled molten spelter before being withdrawn from the galvanizing bath, the steel strip issuing from the bath having an inner iron-zinc alloy coating and an outer molten spelter coating, substantially all the molten spelter coating being removed from at least one surface of the strip by a stream of gas under pressure. Where molten galvanizing spelter coating is left on one side, the weight of the molten layer averages at least 1/10th of an ounce per square foot of coated surface.
    Type: Grant
    Filed: June 16, 1970
    Date of Patent: August 31, 1976
    Assignee: National Steel Corporation
    Inventor: John T. Mayhew
  • White rust prevention for zinc coated surfaces
    Patent number: 3942989
    Abstract: A hot galvanized strip, plate or other ferrous metal workpiece is moved continuously from a cooling tower, and while at a temperature within a range of about 130.degree. to 180.degree. F. its zinc coating surfaces are subjected to the application of a white rust inhibiting master aqueous chemical treating solution. The solution forms a substantially transparent protective film on the coating surfaces that is adherent thereto. The solution contains the compounds and reaction products of two solutions as mixed together, one of which is made up of sodium dichromate dissolved in and reacted with ethylene glycol and the other of which is made of potassium dichromate dissolved in and reacted with ethylene glycol.
    Type: Grant
    Filed: June 15, 1972
    Date of Patent: March 9, 1976
    Inventor: John T. Mayhew