Patents by Inventor Herbert E. Knechtel

Herbert E. Knechtel 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).

  • Method of nitriding steel
    Patent number: 4216033
    Abstract: Method of nitriding steel surfaces by circulating thereover a ternary mixture of ammonia, hydrogen and water at an elevated temperature and atmospheric pressure. Most of the harmful effects of HCN formation are avoided by utilizing a furnace lining consisting of a coated nickel base alloy, and by adding from 1 to 3% water to the nitriding gas and flowing the nitriding gas at a rate as low as 5 to 20 cu. ft. per hour per 100 sq. ft. of steel surface area.
    Type: Grant
    Filed: December 26, 1978
    Date of Patent: August 5, 1980
    Assignee: United States Steel Corporation
    Inventors: Herbert E. Knechtel, Harry H. Podgurski