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1. (WO2019005836) COLLAPSIBLE LIQUID RESERVOIR
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Claims:

1 . A collapsible liquid reservoir, comprising a flexible side wall having a lower step, a middle step and an upper step, each of the steps comprising a riser segment and a tread segment pivotably connected to one another at an external hinge, the step when collapsed defining an acute step angle between the riser and tread segments of about 23°, and the step when expanded defining an obtuse step angle between the riser and tread segments of about 1 15°, the tread of the lower step being pivotably connected to the riser of the middle step at a first internal hinge, and the tread of the middle step being pivotably connected to the riser of the upper step at a second internal hinge .

2. The collapsible liquid reservoir of claim 1 wherein each of the hinges has a hinge thickness of about 0.4 mm.

3. The collapsible liquid reservoir of claim 2 wherein internal and external hinges each have an internal radius of about 0.500 mm and an external radius of about 1 .880 mm.

4. The collapsible liquid reservoir of claim 3 wherein the riser and tread segments have a width of about 2.286 mm.

5. The collapsible liquid reservoir of claim 4 wherein the internal and external hinges a first angled run portion whose length is about 2.713 mm.

6. The collapsible liquid reservoir of claim 5 wherein the hinge angle between the first angled run portion and its adjacent riser segment is about 150°.

7. The collapsible liquid reservoir of claim 6 wherein the riser segment of the lower step has a length of about 16.076 mm.

8. The collapsible liquid reservoir of claim 7 wherein the tread segment of the lower step has a length of about 12.882 mm.

9. The collapsible liquid reservoir of claim 1 further comprising a collar connector pviotably connected to the tread of the upper step at a third internal hinge.

10. The collapsible liquid reservoir of claim 9 wherein the collar connector has a vertical riser segment connected to a horizontally disposed flange.

1 1 . A collapsible liquid reservoir, comprising a flexible side wall having a plurality of steps, each of the steps comprising a riser segment and a tread segment pivotably connected to one another at an external hinge, the tread of at least one step being pivotably connected to the riser of an adjacent step at an internal hinge, and the step segments joined to the internal hinge being symmetrical about a bisector of said hinge.

12. The collapsible reservoir of claim 1 1 wherein one of said steps is a lower step having a lower riser and at least some of the step segments other than the lower riser have a cross section in the shape of a parallelogram with parallel elongated faces and angled runs at the ends.

13. A collapsible liquid reservoir, comprising a flexible side wall having a plurality of steps, each of the steps comprising a riser segment and a tread segment pivotably connected to one another at an external hinge, the tread of at least one step being pivotably connected to the riser of an adjacent step at an internal hinge, the flexible side wall having the shape of a truncated pyramid having a generally square base and four trapezoidal side panels joined to one another at corners.

14. The collapsible liquid reservoir of claim 13 wherein the step segments joined to the internal hinge are symmetrical about a bisector of said hinge.

15. The collapsible reservoir of claim 13 wherein one of said steps is a lower step having a lower riser and at least some of the step segments other than the lower riser have a cross section in the shape of a parallelogram with parallel elongated faces and angled runs at the ends.