Patent ID: 11969929
Assignee: CELGARD, LLC
Field: Chemical engineering (Chemistry)
Classification: CPC B  H  D  Y | IPC B  D  H

Claim 9:
10. A multilayer microporous membrane or film comprising:
two outermost sub-membranes comprising at least three nano-layers (less than 1 micron thick) or micro-layers (1 to 10 microns thick) (or two outermost nano-layers or micro-layers and at least on inner nano-layer or micro-layer), wherein the two outermost nano-layers or micro-layers of the outermost sub-membranes are thinner than at least one inner nano-layer or micro-layer of the outermost sub-membranes; and
at least one inner sub-membrane comprising at least three nano-layers or micro-layers (or two outermost nano-layers or micro-layers and at least one inner nano-layer or micro-layer), wherein the two outermost nano-layers or micro-layers of the at least one inner sub-membrane are thinner than at least one inner nano-layer or micro-layer of the at least one inner sub-membrane.