Apparatus and method for strengthening articles of manufacture through cryogenic thermal cycling

  • US 6,332,325 B1
  • Filed: 08/17/2000
  • Issued: 12/25/2001
  • Est. Priority Date: 08/17/2000
  • Status: Expired due to Term
First Claim
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1. An apparatus for strengthening an article of manufacture by a cryogenic process, a source of cryogenic material connected to the apparatus, the apparatus comprising:

  • a) a bottom portion having a means for prohibiting thermal conduction disposed between an outer and inner shell and defining an inner cavity, the article of manufacture disposed within the inner cavity during the cryogenic process;

    b) a lid mating with the bottom portion for sealing the inner cavity from ambient air;

    c) means for connecting to an electrical power supply;

    d) means for preventing thermal conduction between the inner and outer shells during the cryogenic process disposed between the bottom portion and the lid when the lid seals the inner cavity;

    e) means for evacuating ambient air from within the inner cavity when the lid seals the inner cavity;

    f) means for introducing the source of cryogenic material into the inner cavity;

    g) means for introducing heat into the inner cavity;

    h) means for providing airflow convection within the inner cavity; and

    i) means for controlling a profile of the cryogenic process.

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