Plastics pipes having walls with lengthwise extending channels

Details Plastics pipes having walls with lengthwise extending channels Plastics pipes having walls with lengthwise extending channels

1978-05-09

1981-07-28

Bryant, III, James E.

Pipes and tubular conduits

Combined

With end structure

138148, 138172, 138115, F16L 912, F16L 918

Patent

active

042805341

ABSTRACT:
Plastics pipes comprising an inner and outer wall being interconnected by lengthwise extending connecting partitions, forming channels, the ends of the channels being each separately sealed by sealingly pressing the end walls of a channel to each other after these walls have been heated to a temperature surpassing the plasticizing temperature.

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patent: 3464450 (1969-09-01), Steffenini
patent: 3665967 (1972-05-01), Kachnik
patent: 3747632 (1973-07-01), Kok et al.
patent: 3920268 (1975-11-01), Stewing
patent: 4014369 (1977-03-01), Kobres

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