US2707672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating furnace carbon black
Assignee: Columbian Carbon Co
•
Filing: 1949-03-09
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Granted: 1955-05-03
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Expires: 1969-03-09
Abstract
No abstract record available.
Inventors
- 👤 Carl W Sweitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:15
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/565; C01; C01P; C01P2006/00; C01P2006/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
PROCESS FOR THE TREATMENT OF FURNACE BLACKS WHICH COMPRISES UNIFORMLY HEATING A QUIESCENT, SHALLOW BED OF THE FURNACE BLACK, OF A THICKNESS NOT EXCEEDING ABOUT 1/4 INCH, TO A BLACK-HEAT TEMPERATURE NOT LOWER THAN 650* F. BUT BELOW THE IGNITION TEMPERATURE OF THE PARTICULAR BLACK AND NOT EXCEEDING 1,100* F., NO PORTION OF THE BED OF BLACK BEING PERMITTED TO EXCEED A BLACK-HEAT TEMPERATURE, WHILE PASSING AIR OVER, AND IN CONTACT WITH, THE SURFACE OF THE BED OF HEATED BLACK UNTIL THE SURFACE AREA OF THE PARTICLE OF THE BLACK HAS BEEN COMPLETELY OXIDIZED AS INDICATED BY THE MINIMUM ATTAINABLE PH CHARACTERISTIC, WITHIN THE RANGE OF 2.5 TO 3.5, AND THEN CONTINUING THE TREATMENT AT A BLACK-HEAT TEMPERATURE UNTIL AT LEAST 5% BUT NOT EXCEEDING 75% OF THE BLACK BY WEIGHT HAS BEEN CONSUMED WITHOUT IGINITION.
Claim 2
Dependent Claim
136 words
PROCESS FOR THE TREATMENT OF FURNACE BLACKS WHICH COMPRISES UNIFORMLY HEATING A QUIESCENT, SHALLOW BED OF THE FURNACE BLACK, OF A THICKNESS NOT EXCEEDING ABOUT 1/4 INCH, TO A BLACK-HEAT TEMPERATURE NOT LOWER THAN 650* F. BUT BELOW THE IGNITION TEMPERATURE OF THE PARTICULAR BLACK AND NOT EXCEEDING 1,100* F., NO PORTION OF THE BED OF BLACK BEING PERMITTED TO EXCEED A BLACK-HEAT TEMPERATURE, WHILE PASSING AIR OVER, AND IN CONTACT WITH, THE SURFACE OF THE BED OF HEATED BLACK UNTIL THE SURFACE AREA OF THE PARTICLE OF THE BLACK HAS BEEN COMPLETELY OXIDIZED AS INDICATED BY THE MINIMUM ATTAINABLE PH CHARACTERISTIC, WITHIN THE RANGE OF 2.5 TO 3.5, AND THEN CONTINUING THE TREATMENT AT A BLACK-HEAT TEMPERATURE UNTIL AT LEAST 5% BUT NOT EXCEEDING 75% OF THE BLACK BY WEIGHT HAS BEEN CONSUMED WITHOUT IGINITION.
References Cited (Backward Citations)
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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) | 1958-05-02 | 1958-11-01 | 1959-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-02 | 1962-11-01 | 1963-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-02 | 1966-11-01 | 1967-05-03 | $7700.00 | Window Closed / Lapsed |