Patent ID: 11896933
Assignee: AQUA MEMBRANES, INC.
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 9:
10. A spiral wound permeable membrane system, comprising a membrane spirally wound about a center tube, wherein the membrane has spacing features disposed on a surface of the membrane, wherein the spacing features are configured such that they do not nest with spacing features on adjacent windings when spirally wound, wherein the spacing features comprise a plurality of substantially parallel line segments spaced apart from each other by nonuniform spacing distances, and wherein each spacing feature has a long axis oriented non-parallel to the direction of spiral winding,
wherein the nonuniform spacing distances comprise a plurality of spacing distances, and wherein the largest spacing distance of such spacing distances minus the smallest spacing distance of such spacing distances is less than 15% of the average of all such spacing distances.