Filter assembly comprising two filter elements separated by a hydrophobic foam
First Claim
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1. A canister lid and filter assembly comprising:
- a) a lid for covering an opening in a canister and having a wall defining a vacuum port;
b) an aerosol trap disposed within said vacuum port;
said aerosol trap comprising a first filter element, a second filter element and a spacer wherein said spacer is an annular, hydrophobic foam characterized in that it reduces wicking between the filter elements and wherein at least one of said filter elements is bonded to said spacer; and
c) said aerosol trap being retained within said vacuum port by a retainer.
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Abstract
A filter assembly is disclosed which has a first filter element held by or bonded to a spacer and a second filter element positioned adjacent the spacer on a side of the spacer opposite the first filter.
140 Citations
14 Claims
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1. A canister lid and filter assembly comprising:
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a) a lid for covering an opening in a canister and having a wall defining a vacuum port; b) an aerosol trap disposed within said vacuum port;
said aerosol trap comprising a first filter element, a second filter element and a spacer wherein said spacer is an annular, hydrophobic foam characterized in that it reduces wicking between the filter elements and wherein at least one of said filter elements is bonded to said spacer; andc) said aerosol trap being retained within said vacuum port by a retainer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A vacuum canister and filter assembly comprising:
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a) a container body having an inside and an outside and a lid for sealing the container body, the lid including a wall for defining a passageway between the container inside and the container outside; and b) a filter assembly in the passageway comprising a first filter element, a second filter element and a spacer wherein said spacer is an annular, hydrophobic foam characterized in that it reduces wicking between the filter elements and wherein at least one of said filter elements is bonded to said spacer;
said filter assembly being retained within said passageway by a retainer.
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Specification