US2591024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon black pelleting process
Assignee: Columbian Carbon Co
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Filing: 1950-09-16
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Granted: 1952-04-01
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Expires: 1970-09-16
Abstract
No abstract record available.
Inventors
- 👤 Carl W Sweitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:47
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C01; C01P; C01P2006/00; C01P2006/10; C01P2006/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A PROCESS FOR INCREASING THE STRENGTH OF FURNACE BLACK PELLETS WHICH COMPRISES HEATING THE PERFORMED PELLETS CONTAINING NOT LESS THAN 0.1% OF ACETONE-EXTRACTABLE MATERIAL IN A STATIC, UNRENEWED ATMOSPHERE TO A TEMPERATURE ABOVE THE SOFTENING POINT OF THE ACETONE-EXTRACTABLE MATERIAL BUT BELOW THAT WHERE SUBSTANTIAL COKING IS EFFECTED AND BELOW THAT WHERE THE RUBBER COMPOUNDING CHARACTERISTICS OF THE BLACK ARE SUB STANTIALLY ALTERED, DISCONTINUING THE HEATING AT A POINT WHERE A SUBSTANTIAL PROPORTION OF THE ACETONE-EXTRACTABLE MATERIAL INTIALLY PRESENT IN THE BLACK REMAINS THEREIN AND IMMEDIATELY THEREAFTER COOLING THE PELLETS IN A STATIC ATMPSPHERE TO A TEMPERATURE BELOW THAT WHERE OXIDATION OF THE BLACK RESULTS AND BELOW THAT WHERE SUBSTANTIAL LOSS IN ACTENONE-EXTRACTABLE MATERIAL WOULD RESULT, SO AS TO RETAIN IN THE BLACK A SUBSTANTIAL PROPORTION OF ACETONE-EXTRACTABLE MATERIAL INITIALLY PRESENT THEREIN.
Claim 2
Dependent Claim
132 words
A PROCESS FOR INCREASING THE STRENGTH OF FURNACE BLACK PELLETS WHICH COMPRISES HEATING THE PERFORMED PELLETS CONTAINING NOT LESS THAN 0.1% OF ACETONE-EXTRACTABLE MATERIAL IN A STATIC, UNRENEWED ATMOSPHERE TO A TEMPERATURE ABOVE THE SOFTENING POINT OF THE ACETONE-EXTRACTABLE MATERIAL BUT BELOW THAT WHERE SUBSTANTIAL COKING IS EFFECTED AND BELOW THAT WHERE THE RUBBER COMPOUNDING CHARACTERISTICS OF THE BLACK ARE SUB STANTIALLY ALTERED, DISCONTINUING THE HEATING AT A POINT WHERE A SUBSTANTIAL PROPORTION OF THE ACETONE-EXTRACTABLE MATERIAL INTIALLY PRESENT IN THE BLACK REMAINS THEREIN AND IMMEDIATELY THEREAFTER COOLING THE PELLETS IN A STATIC ATMPSPHERE TO A TEMPERATURE BELOW THAT WHERE OXIDATION OF THE BLACK RESULTS AND BELOW THAT WHERE SUBSTANTIAL LOSS IN ACTENONE-EXTRACTABLE MATERIAL WOULD RESULT, SO AS TO RETAIN IN THE BLACK A SUBSTANTIAL PROPORTION OF ACETONE-EXTRACTABLE MATERIAL INITIALLY PRESENT THEREIN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |