EP 0033570 A1 19810812 - Plastics corrugated pipe.
Title (en)
Plastics corrugated pipe.
Title (de)
Kunststoff-Wellrohr.
Title (fr)
Tuyau ondulé en matière plastique.
Publication
Application
Priority
NL 8000496 A 19800125
Abstract (en)
A plastics corrugated pipe (1) provided with wave crests (3) and wave valleys (2) comprising apertures (4). A water permeable surrounding covering (13) engaging the tops of the wave crests (3) is heat-shrunk onto the plastics pipe (1), said surrounding covering (13) consisting of a foil layer 5 supporting air filled cushions (6). An outer foil layer (7) engages the tops (14) of the cushions. Two layers of air filled cushions (6, 6a) may be connected with each other. The outer foil layer (7) and the inner foil layer (5) are provided with perforations (8, 9). Perforations (11, 17) may also be present in the top (14) and bottom of the cushions (6).
IPC 1-7
IPC 8 full level
E02B 11/00 (2006.01)
CPC (source: EP)
E02B 11/005 (2013.01)
Citation (search report)
- FR 2295175 A1 19760716 - POLVA NEDERLAND BV [NL]
- [A] FR 2129456 A5 19721027 - SMET HUGO
- [A] FR 2341349 A1 19770916 - RIPKEN FASERVERARBEITUNGSWERK [DE]
- [A] DE 916252 C 19540805 - PHOENIX GUMMIWERKE AG
- [A] DE 1022425 B 19580109 - CLEMENS FA LUDWIG
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 81200094 A 19810126; NL 8000496 A 19800125