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Patent US2676873A successfully refreshed from Google Patents.
US2676873A
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Method of lowering the ph of furnace blacks
Assignee: Phillips Petroleum Co
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Filing: 1949-07-15
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Granted: 1954-04-27
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Expires: 1969-07-15
Abstract
No abstract record available.
Inventors
- 👤 Martin R Cines
- 👤 James T Roach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:57
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
THE METHOD OF TREATING AN ALKALINE FURNACE BLACK WHICH COMPRISES SUBJECTING SAID BLACK TO SUCCESSIVE EXTRACTIONS WITH FRESH WATER AT 70 TO 212* F. TO REDUCE THE PH, AND RECOVERING A BLACK OF SUBSTANTIALLY LOWER PH.
Claim 2
Independent Claim
36 words
THE METHOD OF TREATING AN ALKALINE FURNACE BLACK WHICH COMPRISES SUBJECTING SAID BLACK TO SUCCESSIVE EXTRACTIONS WITH FRESH WATER AT 70 TO 212* F. TO REDUCE THE PH, AND RECOVERING A BLACK OF SUBSTANTIALLY LOWER PH.
References Cited (Backward Citations)
US1207694A
Cited
GB429088A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-26 | 1957-10-26 | 1958-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-26 | 1961-10-26 | 1962-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-26 | 1965-10-26 | 1966-04-27 | $7700.00 | Window Closed / Lapsed |