US3295952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making ore briquettes
Assignee: United States Steel Corp
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Filing: 1964-09-22
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Granted: 1967-01-03
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Expires: 1984-09-22
Abstract
No abstract record available.
Inventors
- 👤 Roger T Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:24
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/24; C21; C21B; C21B13/00; C21B13/0086; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A METHOD OF BRIQUETTING SPECULAR HEMATITE FINES COMPRISING HEATING THE FINES UNDER REDUCING CONDITIONS TO RAISE THEIR TEMPERATURE TO THE RANGE OF ABOUT 850 TO 1050F. AND EFFECT ABOUT 15 TO 30 PERCENT PARTIAL REDUCTION OF THE HEMATITE, MIXING LOW-TEMPERATURE BITUMINOUS COAL FINES WITH THE HEATED AND PARTIALLY REDUCED HEMATITE FINES TO PRODUCE A UNIFORMLY DISPERSED MIXTURE CONTAINING ABOUT 5 TO 15 PERCENT COAL AND HAVING AN APPARENT TEMPERATURE IN THE RANGE OF ABOUT 600 TO 800F., COMPACTING THE MIXTURE INTO BRIQUETTES DIRECTLY FOLLOWING THE MIXING STEP AND WHILE IT REMAINS AT A TEMPERATURE IN THE LATTER RANGE, THE COAL ITSELF SERVING AS A BINDER, AND COOLING THE BRIQUETTES BUT PREVENTING REOXIDATION OF THE HEMATITE.
Claim 2
Independent Claim
115 words
A METHOD OF BRIQUETTING SPECULAR HEMATITE FINES COMPRISING HEATING THE FINES UNDER REDUCING CONDITIONS TO RAISE THEIR TEMPERATURE TO THE RANGE OF ABOUT 850 TO 1050F. AND EFFECT ABOUT 15 TO 30 PERCENT PARTIAL REDUCTION OF THE HEMATITE, MIXING LOW-TEMPERATURE BITUMINOUS COAL FINES WITH THE HEATED AND PARTIALLY REDUCED HEMATITE FINES TO PRODUCE A UNIFORMLY DISPERSED MIXTURE CONTAINING ABOUT 5 TO 15 PERCENT COAL AND HAVING AN APPARENT TEMPERATURE IN THE RANGE OF ABOUT 600 TO 800F., COMPACTING THE MIXTURE INTO BRIQUETTES DIRECTLY FOLLOWING THE MIXING STEP AND WHILE IT REMAINS AT A TEMPERATURE IN THE LATTER RANGE, THE COAL ITSELF SERVING AS A BINDER, AND COOLING THE BRIQUETTES BUT PREVENTING REOXIDATION OF THE HEMATITE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |