Pipe construction

Details Pipe construction Pipe construction

1995-10-23

1998-06-16

Scherbel, David

Pipes and tubular conduits

Plural duct

Longitudinally extending common wall

138116, 138129, F16L 918

Patent

active

057655987

ABSTRACT:
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.

REFERENCES:
patent: 1093766 (1914-04-01), Campfield
patent: 3464450 (1969-09-01), Steffenini
patent: 3495628 (1970-02-01), Boender
patent: 3750058 (1973-07-01), Bankert, Sr. et al.
patent: 4215727 (1980-08-01), ter Wijlen
patent: 4461323 (1984-07-01), Morikawa
patent: 4529009 (1985-07-01), Horner et al.
patent: 5497809 (1996-03-01), Wolf

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