Patents by Inventor James M. Leitnaker

James M. Leitnaker 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).

  • Process for removing technetium from iron and other metals
    Patent number: 5885326
    Abstract: A process for removing technetium from iron and other metals comprises the steps of converting the molten, alloyed technetium to a sulfide dissolved in manganese sulfide, and removing the sulfide from the molten metal as a slag.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: March 23, 1999
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: James M. Leitnaker, Lee D. Trowbridge
  • Delta ferrite-containing austenitic stainless steel resistant to the formation of undesirable phases upon aging
    Patent number: 4265983
    Abstract: Austenitic stainless steel alloys containing delta ferrite, such as are used as weld deposits, are protected against the transformation of delta ferrite to sigma phase during aging by the presence of carbon plus nitrogen in a weight percent 0.015-0.030 times the volume percent ferrite present in the alloy. The formation of chi phase upon aging is controlled by controlling the Mo content.
    Type: Grant
    Filed: June 26, 1979
    Date of Patent: May 5, 1981
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventor: James M. Leitnaker
  • Method for homogenizing alloys susceptible to the formation of carbide stringers and alloys prepared thereby
    Patent number: 4221610
    Abstract: A novel fabrication procedure prevents or eliminates the reprecipitation of segregated metal carbides such as stringers in Ti-modified Hastelloy N and stainless steels to provide a novel alloy having carbides uniformly dispersed throughout the matrix. The fabrication procedure is applicable to other alloys prone to the formation of carbide stringers. The process comprises first annealing the alloy at a temperature above the single phase temperature for sufficient time to completely dissolve carbides and then annealing the single phase alloy for an additional time to prevent the formation of carbide stringers upon subsequent aging or thermomechanical treatment.
    Type: Grant
    Filed: February 24, 1978
    Date of Patent: September 9, 1980
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: David N. Braski, James M. Leitnaker
  • Austenitic stainless steel alloys having improved resistance to fast neutron-induced swelling
    Patent number: 4158606
    Abstract: The present invention is based on the discovery that radiation-induced voids which occur during fast neutron irradiation can be controlled by small but effective additions of titanium and silicon. The void-suppressing effect of these metals in combination is demonstrated and particularly apparent in austenitic stainless steels.
    Type: Grant
    Filed: March 15, 1978
    Date of Patent: June 19, 1979
    Assignee: The United States Department of Energy
    Inventors: Everett E. Bloom, James O. Stiegler, Arthur F. Rowcliffe, James M. Leitnaker
  • Austenitic stainless steel alloys having improved resistance to fast neutron-induced swelling
    Patent number: 4011133
    Abstract: The present invention is based on the discovery that radiation-induced voids which occur during fast neutron irradiation can be controlled by small but effective additions of titanium and silicon. The void-suppressing effect of these metals in combination is demonstrated and particularly apparent in austenitic stainless steels.
    Type: Grant
    Filed: July 16, 1975
    Date of Patent: March 8, 1977
    Assignee: The United States of America as represented by the United States Energy Research and Development Administration
    Inventors: Everett E. Bloom, James O. Stiegler, Arthur F. Rowcliffe, James M. Leitnaker