Patent ID: 11945637
Assignee: nan
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 8:
9. A variable volume liquid container, comprising:
a hollow vessel having a closed bottom, an open top, and an inner wall extending between the closed bottom and the open top;
a lid having a center, a top surface, a perimeter, and a bottom surface; and
a leakage pathway formed between the perimeter and the inner wall;
the lid configured to move vertically within the hollow vessel while substantially sealing liquid contained within the vessel from exposure to air outside the vessel, and further configured to evacuate air from the hollow vessel through the leakage pathway by compression of the lid against the liquid; and
the lid further configured to continuously maintain the leakage pathway open between the perimeter of the lid and the inner wall of the vessel as the lid compresses the liquid to cause a desired indication of leakage of the liquid at the leakage pathway.