Negative pressure vessel
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United States of America Patent
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Nov 28, 2017
Issued Date -
N/A
app pub date -
Mar 27, 2014
filing date -
Mar 27, 2013
priority date (Note) -
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Abstract
A balloon is provided having an exostructure comprised of hollow struts or rods and an envelope positioned over the exostructure, and a pump for pumping air out of the balloon to create an air pressure differential between the pressure inside the envelope and the atmospheric pressure outside the envelope, a control system configured to allow air to flow into the envelope to control the altitude of the balloon, and to operate the pump to pump air out of the envelope to control the altitude of the balloon, wherein the material of the envelope is arranged so as to sag between the struts or rods and form at least one catenary surface when there is an air pressure differential between the pressure inside of the balloon envelope and the atmospheric pressure outside the envelope.
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