Patent US3677704A successfully refreshed from Google Patents.
US3677704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of carbon black
Assignee: Phillips Petroleum Co
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Filing: 1971-06-03
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Granted: 1972-07-18
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Expires: 1991-06-03
Abstract
Abstract GRIT IS REMOVED FROM THE GASEOUS MASS IN A CARBON BLACK FURNACE BY PASSING THE GASEOUS MASS OVER A RADIAL PORT OR DEPRESSION IN THE WALL OF THE LOWER PERIPHERY OF THE FURNACE THEREBY ENTRAPPING THE GRIT WHICH IS REMOVED BY MEANS OF A DRAW-OFF CONDUIT.
Inventors
- 👤 John W Byron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:11
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/50; B; B01; B01J; B01J19/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |