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Method of detecting imperfections in a heat-insulating lining

  • US 3,934,451 A
  • Filed: 05/29/1973
  • Issued: 01/27/1976
  • Est. Priority Date: 06/02/1972
  • Status: Expired due to Term
First Claim
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1. A method of detecting imperfections in a heat-insulating lining of foamed material of a wall enclosing a space suitable for cryogenic uses, comprising locally cooling the surface of the lining by scanning with a jet of cooled gas and observing the lining for imperfections in the cooled state.

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