Patent ID: 7997423

Claim:
A container for storing a liquid comprising a tubular canister having a closed bottom, a tubular filter cup having a threaded lower end received within said canister, said lower end having an annular outer edge, a concentric annular inner edge and a downwardly facing planar surface extending between said inner edge and said outer edge, an annular ridge on said downwardly facing planar surface spaced between said inner edge and said outer edge, an annular filter retainer having an upwardly facing annular planar surface complementary to said planar surface of said filter cup and threads complementary to said threaded lower end of said filter cup, a generally planar filter between said downwardly facing planar surface of said filter cup and said upwardly facing planar surface of said retainer, said upwardly facing annular planar surface having an annular ridge thereon concentric with said annular ridge of said filter cup, and said annular ridge on said upwardly facing planar surface having a diameter different from a diameter of said annular ridge on said downwardly facing surface wherein said annular ridge of said filter cup and said annular ridge of said retainer form an undulating surface for retaining an outer end of said filter.