US3150962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulverized coal firing method and system for blast furnace
Assignee: Babcock and Wilcox Co
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Filing: 1962-04-05
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Granted: 1964-09-29
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Expires: 1982-04-05
Abstract
No abstract record available.
Inventors
- 👤 Pearson Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:52
CPC Classifications
F; F23; F23C; F23C1/00; C; C21; C21B; C21B5/00; C21B5/001; C21B5/003; C21B7/00; C21B7/16; F23K; F23K3/00; F23K2203/00; F23K2203/002; F23K2203/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
THE PROCESS OF FIRING A BLAST FURNACE WITH PULVERIZED COAL WHICH COMPRISES THE STEPS OF PREPARING A MIXTURE OF PULVERIZED COAL AND CARRIER AIR IN A PULVERIZING ZONE AT A PRESSURE SUFFICIENTLY HIGH TO OVERCOME THE COMBINED STATIC PRESSURE WITHIN SAID FURNACE AND THE PRESSURE DROP THROUGH THE ENTIRE CONVEYING SYSTEM BETWEEN SAID PULVERIZING ZONE AND SAID FURNACE, MAINTAINING SAID PREPARED MIXTURE IN A PREDETERMINED AIR TO COAL RATIO, SEPARATING THE CARRIER AIR FROM THE PULVERIZED COAD OF SAID MIXTURE, AND INJECTING THE PULVERIZED COAL INTO SAID BLAST FURNACE IN A PLURALITY OF STREAMS OF HIGH PRESSURE AIR AT AN AIR TO COAL RATIO LESS THAN THE RATIO IN SAID PULVERIZING ZONE.
Claim 2
Dependent Claim
112 words
THE PROCESS OF FIRING A BLAST FURNACE WITH PULVERIZED COAL WHICH COMPRISES THE STEPS OF PREPARING A MIXTURE OF PULVERIZED COAL AND CARRIER AIR IN A PULVERIZING ZONE AT A PRESSURE SUFFICIENTLY HIGH TO OVERCOME THE COMBINED STATIC PRESSURE WITHIN SAID FURNACE AND THE PRESSURE DROP THROUGH THE ENTIRE CONVEYING SYSTEM BETWEEN SAID PULVERIZING ZONE AND SAID FURNACE, MAINTAINING SAID PREPARED MIXTURE IN A PREDETERMINED AIR TO COAL RATIO, SEPARATING THE CARRIER AIR FROM THE PULVERIZED COAD OF SAID MIXTURE, AND INJECTING THE PULVERIZED COAL INTO SAID BLAST FURNACE IN A PLURALITY OF STREAMS OF HIGH PRESSURE AIR AT AN AIR TO COAL RATIO LESS THAN THE RATIO IN SAID PULVERIZING ZONE.
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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) | 1967-09-29 | 1968-03-30 | 1968-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-29 | 1972-03-30 | 1972-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-29 | 1976-03-30 | 1976-09-29 | $7700.00 | Window Closed / Lapsed |