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1. (WO1991011124) SHOE SOLE STRUCTURES USING A THEORETICALLY IDEAL STABILITY PLANE
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WHAT IS CLAIMED IS:
1. A shoe sole construction for a shoe, such as a street shoe or athletic shoe comprising:
a sole having a substantially flat sole portion including a foot support surface, a naturally contoured side portion merging with at least a side of the forefoot portion of the said sole portion and conforming substantially to the shape of the associated sides of the human foot sole, and a substantially uniform frontal plane thickness;
said thickness being defined as about the shortest distance between any point on about an upper foot-contacting surface of said shoe sole and about a lower, ground-contacting surface;
said thickness varying in about the sagittal plane and being greater in the forefoot portion than in the heel portion;
said thickness of the naturally contoured side portion about equaling and therefore varying substantially directly with the thickness of the sole portion in about the frontal plane.

2. The shoe sole construction as set forth in claim 1 wherein said naturally contoured side portion extends to at least one of the natural contours underneath the load-bearing foot.

3. The shoe sole construction as set forth in claim 1 wherein at least a forefoot portion of said shoe sole will deform under load and flatten about just does the human foot under load and wherein the material of said shoe sole is of such composition as to allow natural deformation about following that of the foot.

4. The shoe sole construction as set forth in claim 1 wherein approximately freely articulating joints are formed in the shoe sole that parallel those in the foot be removing part or nearly all material of said sole portion between the heel and the forefoot, except under one of the essential structural support elements, the bases of the fifth metatarsal, and except for an upper connecting layer of fabric or thin flexible top sole.

5. The shoe sole construction as set forth in claim 1 wherein an optional shoe sole support for the main longitudinal arch is retained.

6. The shoe sole construction as set forth in claim 1 wherein the forefoot is subdivided into some or all of its component essential structural support and propulsion elements, the individual heads of the metatarsals and the heads of the distal phalanges.

7. The shoe sole construction as set forth in claim 1 wherein said shoe sole includes one or more frontal plane slits through most or nearly all of said shoe sole.

8. The shoe sole construction as set forth in claim 1 wherein said naturally contoured side portion is substantially abbreviated along its sides to a plurality of essential support and propulsion elements, which include the base and lateral tuberosity of the calcaneus, the heads of the metatarsals, the base of the fifth metatarsal, and the head of the first distal phalange.

9. A shoe sole construction for a shoe, such as a street or athletic shoe, comprising:
a shoe sole that conforms substantially to the natural shape of the wearer's foot sole, including portions of its sides, and that has a substantially constant thickness in about frontal plane cross sections, said thickness being defined as about the shortest distance between any point on about the upper foot contacting surface of said shoe sole and about a lower ground-contacting surface,
said thickness varying in about the sagittal plane and said shoe sole including a forefoot portion with said thickness that is greater' than a heel portion.

10. The shoe sole construction as set forth in claim 9 wherein at least a forefoot portion of said shoe sole will deform under load and flatten about just does the human foot under load and wherein the material of said shoe sole is of such composition as to allow natural deformation about following that of the foot.

11. The shoe sole construction as set forth in claim 9 wherein approximately freely articulating joints are formed in the shoe sole that parallel those in the foot be removing part or nearly all material of said sole portion between the heel and the forefoot, except under one of the essential structural support elements, the bases of the fifth metatarsal, and except for an upper connecting layer of fabric or thin flexible top sole.

12. The shoe sole construction as set forth in claim 9 wherein an optional shoe sole support for the main longitudinal arch is retained.

13. The shoe sole construction as set forth in Claim 9 wherein the forefoot is subdivided into some or all of its component essential structural support and propulsion elements, the individual heads of the metatarsals and the heads of the distal phalanges.

14. The shoe sole construction as set forth in claim 9 wherein said shoe sole includes one or more frontal plane slits through most or nearly all of said shoe sole.

15. The shoe sole construction as set forth in claim 9 wherein said naturally contoured side portion is substantially abbreviated along its sides to a plurality of essential support and propulsion elements, which include the base and lateral tuberosity of the calcaneus, the heads of the metatarsals, the base of the fifth metatarsal, and the head of the first distal phalange.

16. A shoe sole construction for a shoe, such as a street or athletic shoe, comprising:
a shoe sole with an upper foot-contacting surface that conforms substantially to the natural shape of the wearer's foot sole, including at least a portion of its sides, and a lower ground-contacting surface that substantially parallels said upper surface,
the sides of said shoe sole being substantially abbreviated for natural flexibility to some or all of those essential portions providing structural support about directly contacting the essential load-bearing structures of the wearer's foot, said essential structures including the base and lateral tuberosity of the calcaneus, the heads of the metatarsals, and the base of the fifth metatarsal and the head of the first distal phalange.

17. The sole construction as set forth in claim 16, wherein said sole will deform under load and flatten about just as does the human foot under load and wherein the material of said shoe sole is of such composition as to allow natural deformation about following that of the foot.

18. The sole construction as set forth in claim 16, wherein said sole is substantially abbreviated underneath the foot to all or part of those essential shoe sole portions providing structural support about directly contacting the load-bearing structures of the wearer's foot, including at least the heel and forefoot portions, however subdivided into elements, and the base of the fifth metatarsal, said essential shoe sole underneath portions being connected by a top layer of flexible materials, to provide natural flexibility substantially paralleling that of the wearer's foot.

19. The sole construction as set forth in claim 18, wherein an optional shoe sole support for the main longitudinal arch is retained.

20. The shoe sole construction as set forth in claim 16 wherein said shoe sole includes one or more frontal plane slits through most or nearly all of said shoe sole.