Lifting gas replenishment in a tethered airship system
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United States of America Patent
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Mar 25, 2014
Grant Date -
Dec 13, 2012
app pub date -
Sep 8, 2011
filing date -
Jun 13, 2011
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Abstract
A system for lifting gas replenishment in a tethered airship system includes an upper airship with a first end of a tether attached to the upper airship. A balloon is configured to travel up the tether toward the upper airship carrying a payload of lifting gas. A method for gas replenishment of an airship is also provided.
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