EP 0052522 A3 19821124 - AN ENHANCED SURFACE TUBE
Title (en)
AN ENHANCED SURFACE TUBE
Publication
Application
Priority
NZ 19558980 A 19801119
Abstract (en)
[origin: EP0052522A2] An enhanced surface tube is made up of at least two conduits with the inner conduit (2) being stainless steel and with a spiral groove (4) extending in from the outer surface of the twin wall tube and forming a radially inwardly extending spiral protuberance (5) on the inner surface of the stainless steel conduit thus interconnecting the two conduits so that in use they will act as a single enhanced surface tube.
IPC 1-7
IPC 8 full level
F28F 21/08 (2006.01); F25B 39/00 (2006.01); F28D 7/02 (2006.01); F28F 1/00 (2006.01); F28F 1/42 (2006.01)
CPC (source: EP)
F28D 7/026 (2013.01); F28F 1/003 (2013.01); F28F 1/42 (2013.01); F28F 1/426 (2013.01); F28F 21/083 (2013.01)
Citation (search report)
- [X] GB 1145513 A 19690319 - KABEL UND METALLWERKE GOTE HOF
- [A] CH 287675 A 19521215 - CALUMET AND HECLA CONSOLIDATED [US]
- [A] FR 1562938 A 19690411
- [A] US 3777343 A 19731211 - D ONOFRIO M
- [A] US 3566615 A 19710302 - ROEDER JOHN JR
- [A] GB 960628 A 19640610 - CALUMET & HECLA
- [A] FR 2347642 A1 19771104 - FRANCE ETAT [FR]
- [A] US 4228848 A 19801021 - WADKINSON JR GEORGE W
- [A] US 4228852 A 19801021 - TOGASHI AKIRA
- [A] DE 1551488 A1 19700423 - NAGAHARA KICHISABURO
- [A] FR 525503 A 19210923 - NORSKE SALTVERKER AS DE [NO]
- [A] US 3826304 A 19740730 - WITHERS J, et al
- [AD] US 2913009 A 19591117 - KUTHE CHARLES H
Designated contracting state (EPC)
AT BE DE FR GB NL SE
DOCDB simple family (publication)
EP 0052522 A2 19820526; EP 0052522 A3 19821124; AU 7757581 A 19820527; JP S57155097 A 19820925; NZ 195589 A 19851011
DOCDB simple family (application)
EP 81305446 A 19811118; AU 7757581 A 19811117; JP 18452581 A 19811119; NZ 19558981 A 19811119