Capillary flow control system for fluid indicator
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United States of America Patent
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Jun 25, 2019
Grant Date -
Nov 6, 2014
app pub date -
Dec 5, 2012
filing date -
Dec 6, 2011
priority date (Note) -
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Abstract
A capillary system for a fluid indicator includes a fluid restrictor, and a capillary tube. The fluid restrictor has a small aperture formed therethrough. The capillary tube is adapted to receive a fluid. The fluid restrictor is sealingly affixed into at least one end of the capillary tube so that the small aperture communicates between the inside of the capillary tube and the outside of the capillary tube. The capillary tube is optionally treated so that an inner surface is oilophobic and hydrophobic. The system better controls the interface or meniscus 14 between the fluids contained in the capillary tube, preventing mixing.
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