US3830173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuyere formed by cementing a ceramic liner in a metal tube
Assignee: United States Steel Corp
•
Filing: 1971-12-28
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Granted: 1974-08-20
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Expires: 1991-12-28
Abstract
Abstract A method of bonding a high density, low-porosity, abrasionresistant, ceramic liner in a metal tube, such as a tuyere or an oxygen lance. The method comprises applying a sodium silicaterefractory aggregate cement to one of the surfaces to be joined, and inserting the liner in the tube. The cement need not be dried, as it does not run. Therefore, the tube can be used immediately, even in high-temperature applications.
Inventors
- 👤 D Hubble
- 👤 J Yount
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:24
CPC Classifications
C; C04; C04B; C04B14/00; C04B14/02; C04B14/04; C04B14/10; C04B14/30; C04B14/303; C04B18/00; C04B18/02; C04B18/023; C04B28/00; C04B28/24; C04B28/26; C04B35/00; C04B35/01; C04B35/10; C23; C23C; C23C24/00; F; F16; F16L; F16L9/00; F16L9/14; Y; Y10; Y10S; Y10S118/00; Y10S118/10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1317
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
13 words
A composite tube according to claim 1 wherein said metal tube is steel.
Claim 2
Dependent Claim
14 words
A composite tube according to claim 1 wherein said metal tube is stainless steel.
Claim 3
Dependent Claim
13 words
A composite tube according to claim 1 wherein said metal tube is copper.
Claim 4
Dependent Claim
13 words
A composite tube according to claim 1 wherein said ceramic tube is alumina.
Claim 5
Dependent Claim
13 words
A composite tube according to claim 1 wherein said ceramic tube is mullite.
Claim 6
Dependent Claim
13 words
A composite tube according to claim 1 wherein said alkali metal is sodium.
Claim 7
Dependent Claim
33 words
A composite tube according to claim 7 wherein said sodium silicate mixture has a sodium oxide content of from 22 to 32 percent and a silica content of from 50 to 60 percent.
Claim 8
Dependent Claim
33 words
A composite tube according to claim 7 wherein said cement consists essentially of about 3 to 6 percent of said sodium silicate mixture and about 94 to 97 percent of said refractory aggregate.
Claim 9
Dependent Claim
18 words
A composite tube according to claim 7 wherein the particle size of said refractory aggregate is -100 mesh.
Claim 10
Dependent Claim
37 words
A tuyere comprising: a composite tube according to claim 1, an outer tube surrounding said composite tube and forming an annular space therebetween, and spacing means between said tubes to maintain said tubes in substantially concentric relation.
Claim 11
Dependent Claim
12 words
A tuyere according to claim 11 wherein said outer tube is steel.
Claim 12
Dependent Claim
13 words
A tuyere according to claim 11 wherein said outer tube is stainless steel.
Claim 13
Dependent Claim
12 words
A tuyere according to claim 11, wherein said outer tube is copper.
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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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |