EP0047527B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Composite dual tubing
Assignee: Nippon Steel Corp
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Filing: 1981-09-08
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Granted: 1985-08-07
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Expires: 2001-09-08
Abstract
No abstract record available.
Inventors
- 👤 Takesada Sasaki
- 👤 Hiroshi Endo
- 👤 Yoshimasa Zama
- 👤 Masahiko Shiraishi
- 👤 Yosinari Miura
- 👤 Masayuki Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 14:28
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/02; F01; F01N; F01N13/00; F01N13/14; F01N13/141; B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/154; F16L9/00; F16L9/21; F01N13/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
122 words
A metallic dual tubing comprising an inner tube (10) and an outer tube (20), said inner tube and said outer tube being in contact or welded with each other at a part of the circumference thereof, characterized in that further at least one stripe of lug (20a) is formed on at least one of the outer surface of said inner tube (10) and the inner surface of said outer tube (20), and extends into contact with the other of said surfaces, which at least one lug (20a) has a height of from 0.1 to 0.5 mm and is formed within the half section of the dual tubing opposite to the half section where the tubes (10, 20) are in contact or welded.
Claim 2
Dependent Claim
122 words
A metallic dual tubing comprising an inner tube (10) and an outer tube (20), said inner tube and said outer tube being in contact or welded with each other at a part of the circumference thereof, characterized in that further at least one stripe of lug (20a) is formed on at least one of the outer surface of said inner tube (10) and the inner surface of said outer tube (20), and extends into contact with the other of said surfaces, which at least one lug (20a) has a height of from 0.1 to 0.5 mm and is formed within the half section of the dual tubing opposite to the half section where the tubes (10, 20) are in contact or welded.
Claim 3
Dependent Claim
33 words
A metallic dual tubing according to claim 1, wherein a heat-resistant filler material (24) is disposed in at least part of the gap between said inner tube (10) and said outer tube (20).
Claim 4
Dependent Claim
26 words
An exhaust pipe of an automobile, characterized in that it is made from the dual tubing in accordance with any one of claims 1 or 2.
References Cited (Backward Citations)
JPS5152515A
Cited
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