Patent US3831918A successfully refreshed from Google Patents.
US3831918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat insulating durable tuyere
Assignee: Nippon Steel Corp
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Filing: 1973-06-13
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Granted: 1974-08-27
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Expires: 1993-06-13
Abstract
Abstract A low expansion ceramic lining is formed on the inner surface of the combustion gas inlet of a tuyere. The low expansion ceramic lining is made of a material which has a thermal expansion coefficient less than 0.5 percent. The low expansion ceramic lining is preferably formed on the inner surface of the tuyere by cementing a low expansion ceramic tube onto the tuyere with a cement consisting of a low expansion ceramic cement or a castable refractory material.
Inventors
- 👤 K Mori
- 👤 T Yamada
- 👤 K Nakamoto
- 👤 T Kato
- 👤 H Onaka
- 👤 T Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:15
CPC Classifications
C; C21; C21B; C21B7/00; C21B7/16
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
35 words
The tuyere of claim 1 wherein the low expansion ceramic lining is composed of 50 - 88% by weight of Li2O.Al2O3.nSiO2, wherein n is 2 - 10 and 50 - 12% by weight alumina cement.
Claim 2
Dependent Claim
47 words
The tuyere of claim 1 wherein the low expansion ceramic lining is composed of 70 - 95% by weight of a low expansion ceramic powder having a thermal expansion coefficient less than 0.5% of the thermal expansion coefficient at 1,000*C and 30 - 5% by weight clay.
Claim 3
Dependent Claim
32 words
The tuyere of claim 1, wherein the low expansion ceramic lining is bonded to said tuyere with a ceramic cement or a refractory castable material containing 15 - 70% by weight SiC.
References Cited (Backward Citations)
US1849718A
Cited
US3069760A
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US3043578A
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US3061300A
Cited
US3341188A
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US3558119A
Cited
US3589318A
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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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |