Water filter
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United States of America Patent
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-
Sep 4, 2012
Grant Date -
May 3, 2012
app pub date -
Nov 30, 2011
filing date -
Jun 16, 2009
priority date (Note) -
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Abstract
A water filter comprising a closed shell, a filter media and a valve. The closed shell having an inlet and an outlet. The filter media is within the shell and arranged such that water flowing from the inlet to the outlet passes through the filter media. The filter media is arranged to filter hydrocarbons from the water to reduce the proportion of hydrocarbons in water exiting the water filter to below a predetermined threshold. The valve is arranged such that water passing through the water filter passes through the valve. The valve comprises a chamber housing a plug of material arranged to absorb a predetermined proportion of hydrocarbons present in water passing through the valve. the plug of material changes its material properties in response to absorbing hydrocarbons to restrict or block the flow of water through the water filter before exhaustion of the filter media causes the proportion of hydrocarbons in water exiting the water filter to rise above the predetermined threshold.
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