Patent US4410013A successfully refreshed from Google Patents.
US4410013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite dual tubing
Assignee: Nippon Steel Corp
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Filing: 1981-09-08
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Granted: 1983-10-18
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Expires: 2001-09-08
Abstract
Abstract A steel tubing and more particularly a composite dual tubing which can be suitably used for an exhaust pipe capable of effectively reducing the radiated noise from the exhaust pipe of automobiles. A metallic dual tubing of the present invention comprises: lugs (20a); lugs (20a) and heat-resistant filler material (24); or, the spacer member (16) and the heat-resistant filler member (17).
Inventors
- 👤 Takesada Sasaki
- 👤 Hiroshi Endo
- 👤 Yoshimasa Zama
- 👤 Masahiko Shiraishi
- 👤 Yosinari Miura
- 👤 Masayuki Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:28
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
115 words
An exhaust pipe for high temperature waste gas from an automobile engine, said exhaust pipe comprising a metal dual tubing characterized in that said metal dual tubing comprises an inner tube and an outer tube which are in contact with each other along substantially the entire longitudinal length of the tubing and further at least one stripe of lug contacts the outer surface of said inner tube and the inner surface of said outer tube, said at least one stripe of lug extending substantially the entire longitudinal direction of the tubing, and said lug is located at the half section of the dual tubing opposite to the half section where the tubes are in contact.
Claim 2
Dependent Claim
115 words
An exhaust pipe for high temperature waste gas from an automobile engine, said exhaust pipe comprising a metal dual tubing characterized in that said metal dual tubing comprises an inner tube and an outer tube which are in contact with each other along substantially the entire longitudinal length of the tubing and further at least one stripe of lug contacts the outer surface of said inner tube and the inner surface of said outer tube, said at least one stripe of lug extending substantially the entire longitudinal direction of the tubing, and said lug is located at the half section of the dual tubing opposite to the half section where the tubes are in contact.
Claim 3
Dependent Claim
29 words
An exhaust pipe according to claim 1, wherein a heat-resistant filler material is disposed in at least part of the gap between said inner tube and said outer tube.
Claim 4
Dependent Claim
22 words
An exhaust pipe according to claim 1 or 2, wherein said lug has a height of from about 0.1 to 0.5 mm.
References Cited (Backward Citations)
US326242A
Cited
US400094A
Cited
US1761281A
Cited
US3133612A
Cited
US3595275A
Cited
US3880194A
Cited
US3946764A
Cited
US4233816A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-17 | 1987-04-18 | 1987-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-17 | 1991-04-18 | 1991-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-17 | 1995-04-18 | 1995-10-18 | $7700.00 | Window Closed / Lapsed |