Rigid ballon

  • US 7,223,151 B2
  • Filed: 08/19/2003
  • Issued: 05/29/2007
  • Est. Priority Date: 02/14/2003
  • Status: Active Grant
First Claim
Patent Images

1. An unpowered apparatus comprising:

  • a flexible material having low permeability to a lighter than air gas, the flexible material defining a chamber;

    at least one structural member coupled to the flexible material such that when the chamber is filled with the gas to a known level, the apparatus is substantially neutrally buoyant under ambient conditions;

    a valve to seal the chamber to maintain the known level during use; and

    a sleeve associated with the flexible material to retain the at least one structural member.

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