US4367868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory lining for a metal pipe
Assignee: SVENSKA HOGANAS AB
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Filing: 1980-02-28
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Granted: 1983-01-11
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Expires: 2000-02-28
Abstract
Abstract A metal pipe, which is to be protected from high temperature and from the attack of molten metals and slags, is protected by an exterior lining consisting of a refractory ceramic composition which has been moulded between two coaxially placed tubes. The inner tube and preferably also the outer tube is a thin-walled metal tube permitting the lining to slide on the metal pipe on thermal movements.
Inventors
- 👤 Ingvar G. A. Blom
- 👤 Reima J. Vuokivi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:56
CPC Classifications
B; B22; B22D; B22D1/00; B22D1/002; B22D1/005; B32; B32B; B32B1/00; B32B1/08; B32B3/00; B32B3/26; B32B3/28; B32B9/00; B32B9/005; B32B9/04; B32B9/041; C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/4606; C21C5/4613; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/3065; B32B2597/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
A lance for supplying materials to metallurgical processes, comprising a steel tube, means at an inlet end of said tube for connecting the tube to a supply hose for said materials, at least one outlet opening for said materials at an outlet end of said tube, and a protecting sheath encompassing said tube, said sheath comprising an inner metal wall sized to form a clearance with said tube, an outer wall, and a refractory ceramic composition between said walls, and means for fastening a front end of said sheath to said steel tube adjacent said outlet end, a second end of said sheath being freely movable relative to said inlet end of said tube.
Claim 2
Dependent Claim
114 words
A lance for supplying materials to metallurgical processes, comprising a steel tube, means at an inlet end of said tube for connecting the tube to a supply hose for said materials, at least one outlet opening for said materials at an outlet end of said tube, and a protecting sheath encompassing said tube, said sheath comprising an inner metal wall sized to form a clearance with said tube, an outer wall, and a refractory ceramic composition between said walls, and means for fastening a front end of said sheath to said steel tube adjacent said outlet end, a second end of said sheath being freely movable relative to said inlet end of said tube.
Claim 3
Dependent Claim
15 words
Apparatus according to claim 1 wherein the outer cylindrical wall comprises a sheet metal tube.
Claim 4
Dependent Claim
24 words
Apparatus according to claim 2 wherein at least one of said inner and outer sheet metal tubes comprises a helically wound sheet metal strip.
Claim 5
Dependent Claim
29 words
Apparatus according to claim 2, wherein at least one of said inner and outer sheet metal tubes is provided with circumferential corrugations on a side facing the ceramic composition.
Claim 6
Dependent Claim
25 words
Apparatus according to claim 2 wherein at least one of the sheet metal tubes is perforated for facilitating drying out of the refractory ceramic composition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-10 | 1986-07-12 | 1987-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-10 | 1990-07-12 | 1991-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-10 | 1994-07-12 | 1995-01-11 | $7700.00 | Window Closed / Lapsed |