Water cooler filter with secure bayonet-type connection

1. A filter for a water cooler comprising a housing with a cavity and cavity ports, said filter comprising:

an end and an axis, said filter end comprising:

a cylindrical base having a base surface at least a portion of which extends in a plane perpendicular to said filter axis; and

a filter neck extending from said base surface, said neck having filter ports and a side surface,

said neck having a bottom section, a lower top section extending upward from the bottom section, an upper top section extending upward from the lower top section and dimensionally smaller than the lower top section, and a plurality of filter ports,

said bottom section having a side surface,

said upper top section having a first planar top surface,

said lower top section having a second planar top surface,

said upper top section comprising a planar step extending upward from the first planar surface and wherein the planar step forms first and second teeth extending outward from a center of the upper top section,

said first and second teeth comprising a first and second edge, wherein said first and second edges are parallel to each other and offset from the center of the upper top section,

said side surface of said neck comprising an elongated protrusion extending in a direction parallel to said axis,

said base surface comprising an inclined surface portion having one or more protrusions extending from said inclined surface portion,

said filter end being configured to be received in the housing in bayonet-type fashion to align said filter ports and the cavity ports.

2. The filter of claim 1 wherein said one or more protrusions on said inclined surface portion of said base surface comprises a set of protrusions selected from the following group: geometric shapes, geometric shapes, symbols, characters, letters, numbers, words, logos, designs, and combinations thereof.

3. The filter of claim 1 wherein said one or more protrusions on said inclined surface portion of said base surface comprise letters which spell a word.

4. The filter of claim 1 wherein said one or more protrusions on said inclined surface portion of said base surface comprise a symbol representing a designation of origin.

5. The filter of claim 1 wherein said one or more protrusions on said inclined surface portion of said base surface extend along said inclined surface portion of said base surface.

6. The filter of claim 1 wherein said at least a portion of said base surface is convex.

7. The filter of claim 1 wherein said base surface surrounds said neck.

8. The filter of claim 1 wherein said side surface of said neck extends in a direction parallel to said filter axis.

9. The filter of claim 1 wherein said side surface of said neck has a bottom edge at an intersection of the side surface with the bottom surface and a top edge opposite the bottom edge and wherein said elongated protrusion extends from said bottom edge of said side surface of said neck.

10. The filter of claim 1 wherein said side surface of said neck has a bottom edge at an intersection of the side surface with the bottom surface and a top edge opposite the bottom edge and wherein said elongated protrusion extends from a location proximate said bottom edge toward said top edge.

11. The filter of claim 1 configured to cooperate with a housing associated with the water cooler, said housing comprising:

a surface,

a cavity with cavity ports,

said housing cavity being configured to receive said filter end neck and comprising a cavity wall adapted to align with said side surface of said filter neck,

said housing surface comprising one or more recesses,

said cavity wall comprising a channel through which said elongated protrusion passes as said filter end is inserted into said housing such that said base surface abuts said housing surface and said filter end can be rotated relative to said housing,

said housing surface being configured to cooperate with said inclined surface portion of said base surface such that said one or more recesses can be aligned with and receive said one or more protrusions, wherein said filter end is fully seated into said housing with said filter ports aligned with said cavity ports.

12. The filter of claim 1 said lower top section comprising:

a second planar step extending upward from the second planar surface and wherein the second planar step forms third and fourth teeth extending outward from a center of the lower top section,

said third and fourth teeth comprising a third and fourth edge, wherein said third and fourth edges are parallel to each other and offset from the center of the lower top section, and wherein said first and third edges are colinear and said second and fourth edges are colinear.

13. The filter of claim 1 said cavity in the housing comprising an upper chamber and lower chamber, wherein the upper chamber is configured to receive the upper top section of the neck and the lower chamber is configured to receive the lower top section of the neck.

14. The filter of claim 1 wherein said upper top section further has a groove separating the first planar surface from the second planar top surface.

15. The filter of claim 14 wherein the groove separating the first planar surface from the second planar top surface extends circumferentially about the upper top section.

16. The filter of claim 1 wherein said lower top section further has a groove separating the second planar top surface from the bottom section.

17. The filter of claim 16 , wherein the groove separating the second planar top surface from the bottom section extends circumferentially about the lower top section.

18. The filter of claim 1 wherein at least one of the plurality of filter ports is disposed on the planar step extending upward from the first planar surface.

19. The filter of claim 1 , wherein at least one of the plurality of filter ports is disposed on the second planar step extending upward from the second planar surface.

20. The filter of claim 13 wherein the housing comprises an upper tooth stop extending inward toward a center of the upper chamber and a lower tooth stop extending inward toward a center of the lower chamber, wherein the upper tooth stop is configured to engage either of the first and second edges of the first and second teeth, and the lower tooth stop is configured to engage either of the third and fourth edges of the third and fourth teeth.

21. The filter of claim 20 wherein at least one of the lower and upper tooth stops have one of said cavity ports therein for receiving flow from at least one of the plurality of filter ports.