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US 4,375,765 AGranted
Level indicating device
OwnerJoseph Frominventor
Life of this patent
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Abstract
A level indicating device comprises a compressible container, which is charged with a measuring liquid, and a flexible transparent tube having a first end immersed in the liquid within the container. The second end of the tube may be affixed to a support which has a reference level marking means mounted thereon. When the device is in use, the surfaces of the fluid in the container and in the second end of the tube are exposed to the ambient atmosphere whereby, when in equilibrium, both surfaces will be at the same level.
Claims18
A measuring device comprising:
- a flexible vessel;
- a measuring liquid contained in said vessel;
- a transparent flexible tube having first and second ends, a first end of said tube being inserted in said vessel to a point below the level of the said liquid therein, the second end of said tube being opened to the ambient atmosphere when the device is in use, the volume of said tube being not greater than the volume of said vessel;
- means for selectively hermetically sealing said vessel whereby liquid may be forced from the sealed vessel into said tube by compression of said vessel and the hermetic seal subsequently removed to expose the surface of the liquid in said vessel to the ambient atmosphere;
- and
- means for providing an indication of the level of liquid in said tube adjacent the second end thereof.
3 more elements
Dependencies are inferred from the claim text.