Importance

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Abstract

Embodiments of a portable water filter are described and shown, each embodiment being adapted to fit and seal into a bottle neck without modification of, or attachment to, the bottle or its cap or other closure. The filter has a flange system that rests on the lip of the bottle neck and that has slanted or curved surfaces to seal with the neck and the bottle cap when the cap is screwed onto the bottle. The filter further includes a connector for attachment to a straw for an alternative use of the filter in a cup or mug. The filter water inlets are preferably in the lower region of the filter housing, to facilitate suctioning of the liquid from the bottom of the cup or mug even when the liquid level is low. Additional liquid inlet(s) may be added to the upper region of the filter housing, preferably sized and located to drain the last, small amount of liquid in the neck of a bottle when the bottle is inverted, without sucking in enough air in the mug-use application to interfere with adequate draining of the mug or cup.

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First Claim