System and method for altitude control

Details System and method for altitude control System and method for altitude control

2004-09-09

2008-12-30

Collins, Timothy D (Department: 3643)

Aeronautics and astronautics

Aircraft control

Airship control

C244S096000

Reexamination Certificate

active

07469857

ABSTRACT:
An differential expansion system and method for balloon buoyancy control which includes a zero-pressure envelope and a superpressure envelope. A gas transfer device is positioned between the envelopes to facilitate the transfer of lift gases that are lighter than air between the envelopes. The superpressure envelope and the gas transfer device can be located inside the zero-pressure envelope. Alternatively, the zero-pressure envelope, the superpressure envelope, and the gas transfer device can be located inside a zero-pressure envelope.

REFERENCES:
patent: 1012559 (1911-12-01), Kalaba
patent: 1056503 (1913-03-01), Cooper
patent: 1477338 (1923-12-01), Finley
patent: 1656780 (1928-01-01), Diago
patent: 6527223 (2003-03-01), Mondale
patent: 6648272 (2003-11-01), Kothmann
patent: 2002/0179771 (2002-12-01), Senepart
patent: 2003/0127560 (2003-07-01), Liss
patent: 2003/0234320 (2003-12-01), Colting

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