Advanced Drainage Systems, Inc.

Lester H Gabriel

James B Goddard

An improved pipe construction is disclosed having an inner and outer surface, intermediate walls extending between the inner and outer surfaces, and a plurality of primary and secondary internal cells. There are twice as many secondary internal cells as there are primary internal cells. Each of the primary internal cells is of a circular cross-section, while each of the secondary internal cells is of a three-sided cross-section. The primary and secondary cells are wound about the central longitudinal axis of the pipe. A method of forming the pipe of this structure is also disclosed.

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Sacramento, CA, United States of America

Lester H Gabriel