Patent ID: 11964748
Assignee: LTAG SYSTEMS INC
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 20:
21. An aerostat comprising:
an inflatable structure defining a volume having a neck;
a drain valve within the volume of the inflatable structure; and
at least one tether coupled to the drain valve within the volume and securable to a payload outside of the volume, the drain valve movable from a first position to a second position in the volume in response to tension on the at least one tether from weight of the payload secured to the at least one tether, the first position of the drain valve spaced from the neck to receive a lifting gas into the volume of the inflatable structure, and the drain valve in the second position in sealed engagement with the inflatable structure along the neck to control accumulation of condensate from the lifting gas within the volume.