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

Claim 14:
15. 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; and
a lid configured to move vertically within the hollow vessel while substantially sealing liquid contained within the vessel from exposure to air outside the vessel, the lid having a top surface and a perimeter, and configured to evacuate air from the hollow vessel through a leakage pathway by compression of the lid against the liquid;
the leakage pathway continuously open between the perimeter of the lid and the inner wall of the vessel as the lid compresses the liquid to permit leakage of the liquid through the leakage pathway and thereby provide a visual indication of the leakage between the top surface of the lid and the inner wall of the hollow vessel.