Patent US2495925A successfully refreshed from Google Patents.
US2495925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing carbon black products
Assignee: Columbian Carbon Co
•
Filing: 1944-09-28
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Granted: 1950-01-31
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Expires: 1964-09-28
Abstract
No abstract record available.
Inventors
- 👤 Henry C Foster
- 👤 Johnson Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:48
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
THE PROCESS WHICH COMPRISES FEEDING FINELYDIVIDED CARBON BLACK AT SUCH A RATE AND IN SUCH MANNER TO A HEATING ZONE FOR FREE AND CLEAR FALL THERETHROUGH THAT IT PASSES THROUGH SAID ZONE IN NON-COMPACTED, LOOSE AND FLUFFY CONDITION BY GRAVITY FLOW, AND HEATING SAID BLACK IN SAID ZONE SUBSTANTIALLY INSTANTANEOUSLY TO A TEMPERATURE OF AT LEAST 1800*F.
Claim 2
Dependent Claim
57 words
THE PROCESS WHICH COMPRISES FEEDING FINELYDIVIDED CARBON BLACK AT SUCH A RATE AND IN SUCH MANNER TO A HEATING ZONE FOR FREE AND CLEAR FALL THERETHROUGH THAT IT PASSES THROUGH SAID ZONE IN NON-COMPACTED, LOOSE AND FLUFFY CONDITION BY GRAVITY FLOW, AND HEATING SAID BLACK IN SAID ZONE SUBSTANTIALLY INSTANTANEOUSLY TO A TEMPERATURE OF AT LEAST 1800*F.
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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) | 1953-01-30 | 1953-08-01 | 1954-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-30 | 1957-08-01 | 1958-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-30 | 1961-08-01 | 1962-01-31 | $7700.00 | Window Closed / Lapsed |