Patents by Inventor James N. Sajatovic

James N. Sajatovic 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 for producing hardened flutes in a kelly bar
    Patent number: 5593603
    Abstract: A method for processing a carbon steel body by electric arc gouging with a carbon electrode to create flutes with a hardened heat zone containing finely dispersed martensite beneath the bottom surface of each flute. This process can form a kelly bar having hardened flutes for improved wear. Preferably the carbon steel body composition is according to the AISI 4130 standard.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: January 14, 1997
    Assignee: Ingersoll-Rand Company
    Inventor: James N. Sajatovic
  • Kelly bar having hardened flutes
    Patent number: 5586610
    Abstract: A kelly bar for rotary drilling machines comprises a hollow, tubular, elongated body having a plurality of electric arc gouged flutes therein, each flute having a hardened, heat-affected zone beneath its bottom surface to provide improved wear.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: December 24, 1996
    Assignee: Ingersoll-Rand Company
    Inventor: James N. Sajatovic