US3460934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blast furnace method
Assignee: Individual
•
Filing: 1966-12-19
•
Granted: 1969-08-12
•
Expires: 1986-12-19
Abstract
No abstract record available.
Inventors
- 👤 John J Kelmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:16
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/06; C21B5/001; C21B5/003; C21B2100/00; C21B2100/40; C21B2100/44; C21B2100/60; C21B2100/64; Y; Y02; Y02P; Y02P10/00; Y02P10/25; Y10; Y10S; Y10S75/00; Y10S75/961
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
THE METHOD OF MAKING IN A BLAST FUNACE, COMPRISING OF CHARGING THE FURNACE FROM THE TOP WITH IRON ORE AND COKE AND LIMESTONE, CONTINUOUSLY DELIVERING A BLAST OF HYDROCARBON FUEL AND SUBSTANTIALLY PURE OXYGEN TO THE HEARTH OF THE FURNACE, RECOVERING THE TOP GASES ISSUING FROM THE TOP OF THE FURNACE, RECIRCULATING AT LEAST A PORTION OF SAID TOP GASES TO THE HEARTH OF THE FURNACE AND UTILIZING SAID PORTION TO CONTINUOUSLY INJECT A MIXTURE OF FINE COMBUSTIBLE SOLIDS, PULVERIZED ORE AND LIMESTONE INTO THE HEARTH OF THE FURNACE.
Claim 2
Independent Claim
89 words
THE METHOD OF MAKING IN A BLAST FUNACE, COMPRISING OF CHARGING THE FURNACE FROM THE TOP WITH IRON ORE AND COKE AND LIMESTONE, CONTINUOUSLY DELIVERING A BLAST OF HYDROCARBON FUEL AND SUBSTANTIALLY PURE OXYGEN TO THE HEARTH OF THE FURNACE, RECOVERING THE TOP GASES ISSUING FROM THE TOP OF THE FURNACE, RECIRCULATING AT LEAST A PORTION OF SAID TOP GASES TO THE HEARTH OF THE FURNACE AND UTILIZING SAID PORTION TO CONTINUOUSLY INJECT A MIXTURE OF FINE COMBUSTIBLE SOLIDS, PULVERIZED ORE AND LIMESTONE INTO THE HEARTH OF THE FURNACE.
References Cited (Backward Citations)
US2790711A
Cited
GB275601A
Cited
US1713436A
Cited
US2195866A
Cited
US2799576A
Cited
US2938782A
Cited
GB872062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-11 | 1973-02-10 | 1973-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-11 | 1977-02-10 | 1977-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-11 | 1981-02-10 | 1981-08-12 | $7700.00 | Window Closed / Lapsed |