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Spacer in concentric tube systems

  • US 4,259,990 A
  • Filed: 06/20/1979
  • Issued: 04/07/1981
  • Est. Priority Date: 06/20/1979
  • Status: Expired due to Term
First Claim
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1. A thermally insulating spacer construction for a concentric tube system, the system being comprised of, or including, an inner tube and an outer tube, the spacer construction being a helical device on the inner tube, the device comprising a plurality of braided strand elements, forming a single, nontubular, coreless braid which is helically wound on the inner tube, as a whole.

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