Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Corrugating
Patent
1984-12-03
1987-04-07
Epstein, Henry F.
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Corrugating
83 54, 138121, 264154, 428 36, F16L 1111
Patent
active
046559868
ABSTRACT:
A method of making blow-molded perforated tubing and the tubing made by said method is provided. In the method of the invention, hollow-walled protuberances are blow molded into the side of the tubing as the tubing is formed and perforations are formed by cutting the hollow-walled protuberances.
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Cothran Liggett A.
Ensley R. Neal
Holden Homer N.
Morgan Edward L.
Stevens Robert E.
Dayco Products Inc.
Epstein Henry F.
Tassone Joseph V.
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