Patents by Inventor John J. Dwyer, Jr.

John J. Dwyer, Jr. 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 forming heat treating atmospheres
    Patent number: 5779826
    Abstract: The present invention is directed to a method for forming a heat treating atmosphere in which a nitrogen rich gas containing small amounts of oxygen is preheated. An oxygen-reactive gas, such as a hydrocarbon gas, is combined with the nitrogen rich gas and the mixture is reacted outside of the furnace at temperatures above which substantial sooting does not occur. The resulting heat treating atmosphere is then forwarded to the furnace for conducting the heat treating process.
    Type: Grant
    Filed: September 29, 1997
    Date of Patent: July 14, 1998
    Assignee: The BOC Group, Inc.
    Inventors: Harbhajan S. Nayar, John J. Dwyer, Jr., Edward Chang
  • Argon employing heat treating process
    Patent number: 5614039
    Abstract: Method for heat treating a metal in which argon gas is selectively injected into the cooling zone of a heat treating apparatus when the temperature therein is above the level at which significant nitriding will occur.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: March 25, 1997
    Assignee: The BOC Group, Inc.
    Inventors: Harbhajan S. Nayar, John J. Dwyer, Jr., Neeraj Saxena