Patents by Inventor John N. Polakowski

John N. Polakowski 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).

  • Patent number: 4144379
    Abstract: A drawing quality hot-dip coated low carbon aluminum killed steel strip produced by conventional steel strip forming and continuous hot-dip coating procedures wherein the hot rolled coiling temperature is maintained within a temperature range of 1250.degree. F. - 1300.degree. F. and the cold rolled steel strip is continuously heat treated on a Sendzimir-type continuous hot-dip coating line at a temperature of between 1850.degree. F. and 1950.degree. F. before cooling the strip to about the temperature of the hot-dip coating bath and immersing the strip in a hot-dip galvanizing or aluminum coating bath followed by conventional annealing. The microstructure of the drawing quality hot-dip coated steel strip is characterized by spaced islands formed of fine pearlite and fine ferrite having a grain size of about ASTM 9-10 surrounded by areas of large ferrite grains having the grain size of about ASTM 7.5-8.
    Type: Grant
    Filed: September 2, 1977
    Date of Patent: March 13, 1979
    Assignee: Inland Steel Company
    Inventors: Ram S. Patil, John N. Polakowski