Glass bottle for containing liquid

1. A bottle for containing liquid, the bottle comprising:

a single-piece glass body comprising a base, a cap-engaging portion and a neck;

the cap-engaging portion defining an opening of the bottle and configured to engage with a bottle cap;

the neck comprising a top end and a bottom end, the top end of the neck being adjacent the cap-engaging portion;

the neck further comprising an inner surface that defines a channel between the top end and the bottom end;

the base extending from the bottom end of the neck and comprising a liquid-containing space therein; and

at least one inwardly-protruded spiral guide formed on the inner surface of the neck and configured to guide at least part of liquid to spirally flow through the channel when discharging liquid from the liquid-containing space, wherein the at least one inwardly-protruded spiral guide generally spirally extends about a central axis of the bottle that passes through the channel and the liquid-containing space,

wherein a cross-section of the base taken in a plane perpendicular to the central axis is generally circular and has an inner diameter, wherein the base has a level at which the inner diameter is largest, wherein the at least one inwardly-protruded spiral guide continuously extends from the top end of the neck to the base passing the level at which the inner diameter is largest.

2. The bottle of claim 1 , wherein the inner surface of the neck with the at least one inwardly-protruded spiral guide includes a general shape of a letter “C” or a reversed letter “C” in a cross-section taken in a plane parallel to the central axis.

3. The bottle of claim 1 , wherein the at least one inwardly-protruded spiral guide extends circumferentially about the central axis about 180° or more.

4. An article comprising:

the bottle of claim 3 ; and

liquid contained in the liquid-containing space of the base.

5. A method of discharging liquid contained in a bottle, the method comprising:

providing the article of claim 4 ;

tilting the bottle to discharge at least part of the liquid out of the bottle;

wherein the at least one inwardly-protruding spiral guide causes at least part of the liquid to at least in part spirally flow along the at least one inwardly-protruded spiral guide when passing through the channel.

6. The bottle of claim 1 , wherein the at least one inwardly-protruded spiral guide extends circumferentially about the central axis about 270° or more.

7. The bottle of claim 1 , wherein the at least one inwardly-protruded spiral guide extends circumferentially about the central axis about 360° or more.

8. The bottle of claim 1 , wherein in a cross-section taken in a plane parallel to the central axis, the at least one inwardly-protruded prial guide provides multiple peaks and multiple valleys, which comprise a leading valley, a trailing valley and a first peak interposed between the leading valley and trailing valley, the trailing valley being located closer to the base than the leading valley, there being no intervening peak or valley between the first peak and the leading valley, there being no intervening peak or valley between the first peak and the trailing valley,

wherein in the cross-section, the first peak is defined with a leading slope, a trailing slope and a tip connecting the leading and trailing slopes, the leading slope being defined between the tip of the first peak and the bottom of the leading valley, the trailing slope being defined between the tip of the first peak and the bottom of the trailing valley,

wherein in the cross-section the leading slope is longer than the trailing slope.

9. The bottle of claim 8 , wherein the at least one inwardly-protruded spiral guide extends circumferentially about the central axis about 270° or more.

10. The bottle of claim 8 , wherein the at least one inwardly-protruded spiral guide extends circumferentially about the central axis about 360° or more.

11. The bottle of claim 1 , wherein in a cross-section taken in a plane parallel to the central axis, the at least one inwardly-protruded spiral guide provides multiple peaks and multiple valleys,

wherein in the cross-section, the first peak is defined with a leading slope and a trailing sloop, the trailing slope being closer to the base than the leading slope, the leading slope comprising a portion generally defined with a first radius of curvature, the trailing slope comprising a portion generally defined with a second radius of curvature,

wherein in the cross-section the first radius of curvature is greater than the second radius of curvature.

12. The bottle of claim 11 , wherein the at least one inwardly-protruded spiral guide extends circumferentially about the central axis about 180° or more.

13. The bottle of claim 11 , wherein the at least one inwardly-protruded spiral guide extends circumferentially about the central axis about 270° or more.

14. A method of discharging liquid contained in a bottle, the method comprising:

providing the bottle of claim 11 , in which liquid is contained, wherein the bottle comprising an opening at the top end;

tilting the bottle to discharge at least part of the liquid out of the bottle through the opening;

wherein the at least one inwardly-protruded spiral guide causes at least part of the liquid to at least in part spirally flow along the at least one inwardly-protruded spiral guide when passing through the channel,

wherein the liquid being discharged does not block the opening such that ambient air flows into the bottle, which facilitates discharging of the liquid out of the bottle.

15. The method of claim 14 , wherein as the liquid is discharged out of the bottle, vapor pressure inside the bottle decreases, which in turn causes ambient air to flow into the bottle, which further facilitates discharging of the liquid out of the bottle.

16. The method of claim 14 , wherein the spirally flowing liquid forms an air path inside the neck of the bottle.

17. The bottle of claim 1 , wherein the single-piece glass body further comprises a rim at the top end of the neck, wherein the at least one inwardly-protruded spiral guide extends between the top end and the bottom end.

18. The bottle of claim 1 , wherein in a cross-section taken in a plane parallel to the central axis the at least one inwardly-protruded spiral guide provides multiple peaks and multiple valleys, wherein two immediately neighboring ones of the multiple peaks have a generally uniform distance.

19. The bottle of claim 1 , wherein the at least one inwardly-protruded spiral guide comprises two immediately neighboring peaks that generally spirally extend with a gap therebetween, wherein the gap is maintained generally uniformly over the extension thereof.

20. The bottle of claim 1 , wherein the at least one inwardly-protruded spiral guide is recognizable in a perspective view of the glass body from the outside.

21. The bottle of claim 1 , wherein the neck comprises an outer surface and at least one depression on the outer surface that spirally extends and corresponds to the at least one inwardly protruded spiral guide.

22. The bottle of claim 1 , wherein with the presence of the at least one inwardly-protruded spiral guide, the neck comprises an undulating cross-sectional portion when the cross-section is taken in a plane parallel to the central axis.

23. The bottle of claim 1 , wherein a cross-section of the base taken in a plane perpendicular to the central axis is generally in a circular shape and has an inner diameter, wherein the base has a level at which the inner diameter is the largest, wherein the at least one inwardly-protruded spiral guide does not extend to the level at which the inner diameter is the largest.

24. The bottle of claim 23 , wherein the base comprises a portion in which the inner diameter of a cross-section of the base gradually increases along the central axis away from the neck.