US2900737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of case hardening carbon black pellets
Assignee: Columbian Carbon Co
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Filing: 1956-12-24
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Granted: 1959-08-25
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Expires: 1976-12-24
Abstract
No abstract record available.
Inventors
- 👤 George L Heller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:34
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/58; C01; C01P; C01P2006/00; C01P2006/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
METHOD OF PRODUCING SUBSTANTIALLY DRY BEADS OF CARBON BLACK HAVING EXCEPTIONALLY HIGH RESISTANCE TO CRUSING AND PACKING WHICH COMPRISES UNIFORMLY WETTING THE OUTER PORTIONS ONLY OF PERFORMED DRY-PROCESS BEADS HAVING A BULK DENSITY OF AT LEAST 20.5 POUNDS PER CUBIC FOOT, WITH WATER IN PROPORTIONS WITHIN THE RANGE OF 40 POUNDS TO 90 POUNDS PER 100 POUNDS OF THE DRY-PROCESS BEADS AND THEREAFTER DRYING THE BEADS TO A MOISTURE CONTENT NOT EXCEEDING ABOUT 1% BY WEIGHT.
Claim 2
Dependent Claim
76 words
METHOD OF PRODUCING SUBSTANTIALLY DRY BEADS OF CARBON BLACK HAVING EXCEPTIONALLY HIGH RESISTANCE TO CRUSING AND PACKING WHICH COMPRISES UNIFORMLY WETTING THE OUTER PORTIONS ONLY OF PERFORMED DRY-PROCESS BEADS HAVING A BULK DENSITY OF AT LEAST 20.5 POUNDS PER CUBIC FOOT, WITH WATER IN PROPORTIONS WITHIN THE RANGE OF 40 POUNDS TO 90 POUNDS PER 100 POUNDS OF THE DRY-PROCESS BEADS AND THEREAFTER DRYING THE BEADS TO A MOISTURE CONTENT NOT EXCEEDING ABOUT 1% BY WEIGHT.
References Cited (Backward Citations)
US2538482A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |