Patent ID: 11939792
Assignee: ATLAS SURVIVAL SHELTERS LLC
Field: Civil engineering (Other fields)
Classification: CPC E  F  Y | IPC E  F

Claim 15:
16. The underground shelter of claim 13 further comprising:
the at least one surface intake pipe having at least one lower disposal pipe segment, wherein the at least one lower disposal pipe segment protrudes downward away from the point on the corresponding surface intake pipe at which the corresponding sloped intake pipe is connected to the surface intake pipe;
the at least one lower disposal pipe segment having at least one check valve, wherein the at least one check valve is connected to the at least one lower disposal pipe at its distal end, wherein the at least one check value is arranged to allow for condensation received from the corresponding sloped intake pipe to egress out of the at least one lower disposal pipe segment but air is inhibited from entering into the corresponding surface intake pipe through the at least one check valve.