Patent US3245820A successfully refreshed from Google Patents.
US3245820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of long-flow carbon black
Assignee: Columbian Carbon Co
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Filing: 1963-02-07
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Granted: 1966-04-12
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Expires: 1983-02-07
Abstract
No abstract record available.
Inventors
- 👤 Paul J Melore
- 👤 Frank J Eckert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:42
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/565; C01; C01P; C01P2006/00; C01P2006/12; C01P2006/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
METHOD FOR PRODUCING A LONG FLOW, HIGH COLOR CARBON BLACK FROM AN OIL FURNACE BLACK WHICH COMPRISES INTIMATELY CONTACTING AN OZONE-CONTAINING GAS STREAM WITH A LOW STRUCTURE OIL FURNACE BLACK AT A TEMPERATURE BELOW ABOUT 300*F. WHICH EMBODIES THE FOLLOWING CHARACTERISTICS WITHIN THE INDICATED RANGES:
Claim 2
Dependent Claim
45 words
METHOD FOR PRODUCING A LONG FLOW, HIGH COLOR CARBON BLACK FROM AN OIL FURNACE BLACK WHICH COMPRISES INTIMATELY CONTACTING AN OZONE-CONTAINING GAS STREAM WITH A LOW STRUCTURE OIL FURNACE BLACK AT A TEMPERATURE BELOW ABOUT 300*F. WHICH EMBODIES THE FOLLOWING CHARACTERISTICS WITHIN THE INDICATED RANGES:
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) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |