Patents by Inventor Harri Nevalainen

Harri Nevalainen 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).

  • High strength steel for diffusion chromizing
    Patent number: 4249961
    Abstract: A high strength steel especially suitable for diffusion chromizing and a method for making same is described. The high strength steel comprises a carbon content of 0.01 to 0.08%, 0.1 to 1.0% silicon, 0.5 to 2.2% manganese, 2.0 to 10% chromium, 0.01 to 0.4% molybdenum, 0.002 to 0.05% aluminum, up to 1% of a carbide former and iron with normal impurities. The low carbon steel is heated at an elevated temperature (e.g., 1100.degree. C.) in the presence of chromium to effect diffusion of the chromium into the steel surface whereby a diffusion layer with a high concentration of chromium is formed.
    Type: Grant
    Filed: July 5, 1978
    Date of Patent: February 10, 1981
    Inventor: Harri Nevalainen
  • Permeability responsive oscillator for detecting phase transformations at various cooling rates
    Patent number: 4105971
    Abstract: A device for detecting phase transformations in a magnet material is disclosed. A sample is placed in a coil coupled to a harmonic oscillator and subjected to heat radiation means for simulating predetermined heating and cooling rates which result in phase transformations within the material being tested. The phase transformations are a function of changes in magnetic permeability which vary with temperature changes.
    Type: Grant
    Filed: September 13, 1976
    Date of Patent: August 8, 1978
    Inventor: Harri Nevalainen