Patents by Inventor Richard M. Chrenko

Richard M. Chrenko 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).

  • Annealing synthetic diamond type Ib
    Patent number: 4174380
    Abstract: Type Ib synthetic diamond crystal is annealed at an annealing temperature ranging from about 1500.degree. C. to about 2200.degree. C. under a pressure which prevents significant graphitization of the diamond during the annealing to convert at least about 20% of the total amount of type Ib nitrogen present in the crystal to type Ia nitrogen.
    Type: Grant
    Filed: December 14, 1977
    Date of Patent: November 13, 1979
    Assignee: General Electric Company
    Inventors: Herbert M. Strong, Richard M. Chrenko, Roy E. Tuft
  • Annealing type Ib or mixed type Ib-Ia natural diamond crystal
    Patent number: 4124690
    Abstract: Type Ib or mixed type Ib-Ia natural diamond crystal is annealed at an annealing temperature ranging from about 1500.degree. C to about 2200.degree. C under a pressure which prevents significant graphitization of the diamond during the annealing to convert at least 20% of the total amount of type Ib nitrogen present in the crystal to type Ia nitrogen.
    Type: Grant
    Filed: December 2, 1977
    Date of Patent: November 7, 1978
    Assignee: General Electric Company
    Inventors: Herbert M. Strong, Richard M. Chrenko, Roy E. Tuft
  • Process for reducing stress corrosion in a weld by applying an overlay weld
    Patent number: 4049186
    Abstract: The stress corrosion tendency of a welded pipe in service in a nuclear reactor water line is reduced by applying to the outside of the pipe a secondary weld bridging the primary weld of the joint beyond the axial extremities of the primary weld heat affected zone and particularly that part of the zone at the inner surface of the pipe.
    Type: Grant
    Filed: October 20, 1976
    Date of Patent: September 20, 1977
    Assignee: General Electric Company
    Inventors: Rodney E. Hanneman, Richard M. Chrenko, Donald B. Kittle