Plastics pipes having walls with lengthwise extending channels
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United States of America Patent
Stats
-
Jul 28, 1981
Issued Date -
N/A
app pub date -
May 9, 1978
filing date -
Oct 3, 1975
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Family
International Classification(s)
Cited Art Landscape
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