Patent US3801084A successfully refreshed from Google Patents.
US3801084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the protection of a tuyere of a refining converter
Assignee: Creusot Loire SA
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Filing: 1972-09-07
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Granted: 1974-04-02
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Expires: 1992-09-07
Abstract
Abstract A process of protecting a tuyere of a refining converter having a double or multiple feed of which one, which may be the central feed, is pure oxygen, the process comprising feeding preferably a peripheral conduit with a viscous, a pasty, or powdery and compressed material containing carbon to protect the nose of the tuyere against wear by hot corrosion.
Inventors
- 👤 P Leroy
- 👤 E Sprunck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:08
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/48
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
22 words
Process for protection of a tuyere according to claim 1, the carbon containing material being a paste of paraffin in fuel oil.
Claim 2
Dependent Claim
15 words
Process for protection of a tuyere according to claim the material carbon containing being vaseline.
Claim 3
Dependent Claim
44 words
Process for protection of a tuyere according to claim 1, the carbon containing material being residues from the treatment of crude mineral oils selected from the group consisting of semi-fluid pitches, soft pitches, hard pitches, heavy fuel oil, extra heavy fuel oil and greases.
Claim 4
Dependent Claim
17 words
Process for protection of a tuyere according to claim 1, the carbon containing material compressed powdered coke.
Claim 5
Dependent Claim
19 words
Process for protection of a tuyere according to claim 1, the carbon containing material being pulverized carbon in suspension.
Claim 6
Dependent Claim
20 words
Process for protection of a tuyere according to claim 1, the carbon containing material being petroleum coke in fuel oil.
Claim 7
Dependent Claim
16 words
Process for protection of a tuyere according to claim 1, the carbon containing material being tar.
Claim 8
Dependent Claim
29 words
Process for protection of a tuyere according to claim 1, the carbon containing material being a pasty filling of tar and of a refractory lining material in small fragments.
References Cited (Backward Citations)
US3706549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |