US2725985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flotation of carbon black
Assignee: Monsanto Chemicals Ltd
•
Filing: 1953-04-06
•
Granted: 1955-12-06
•
Expires: 1973-04-06
Abstract
No abstract record available.
Inventors
- 👤 Walter B Howard
- 👤 Herbert H Nelson
- 👤 Rosenberg Raymond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:00
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/58; C02; C02F; C02F1/00; C02F1/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A PROCESS FOR CLARIFYING WATER CONTAINING SMALL QUANTITIES OF DISPERSED CARBON WHICH COMPRISES INJECTING AN INERT GAS UNDER A PRESSURE OF 10 TO 100 POUNDS PER SQUARE INCH GAUGE INTO SAID WATER, TREATING SAID WATER, WHILE STILL UNDER PRESSURE, BY ADDING THERETO FOR EVERY GALLON OF SAID WATER, FROM ABOUT 0.5 G. TO 0.8 G. OF DIESEL OIL, FROM ABOUT 0.01 G. TO 0.1 G. OF METHYL CELLULOSE, A QUANTITY OF AN ALKALI METAL HYDROXIDE SUCH THAT THE PH OF THE WATER AFTER THE ADDITION OF THE FLOCCULATING AGENT LIES BETWEEN 7 AND 8, FROM ABOUT 0.06 G. TO 2.0 G. OF FERRIC SULFATE AS A FLOCCULATING AGENT, THEN DEPRESSURIZING THE RESULTING MIXTURE WHEREBY A SOOT-FOAM-FLOC LAYER IS FORMED ON THE SURFACE OF THE WATER, REMOVING SAID SOOT-FOAM-FLOC LAYER, AND RERECOVERING THE CLARIFIED WATER SUBSTANTIALLY FREE OF CARBON.
Claim 2
Dependent Claim
138 words
A PROCESS FOR CLARIFYING WATER CONTAINING SMALL QUANTITIES OF DISPERSED CARBON WHICH COMPRISES INJECTING AN INERT GAS UNDER A PRESSURE OF 10 TO 100 POUNDS PER SQUARE INCH GAUGE INTO SAID WATER, TREATING SAID WATER, WHILE STILL UNDER PRESSURE, BY ADDING THERETO FOR EVERY GALLON OF SAID WATER, FROM ABOUT 0.5 G. TO 0.8 G. OF DIESEL OIL, FROM ABOUT 0.01 G. TO 0.1 G. OF METHYL CELLULOSE, A QUANTITY OF AN ALKALI METAL HYDROXIDE SUCH THAT THE PH OF THE WATER AFTER THE ADDITION OF THE FLOCCULATING AGENT LIES BETWEEN 7 AND 8, FROM ABOUT 0.06 G. TO 2.0 G. OF FERRIC SULFATE AS A FLOCCULATING AGENT, THEN DEPRESSURIZING THE RESULTING MIXTURE WHEREBY A SOOT-FOAM-FLOC LAYER IS FORMED ON THE SURFACE OF THE WATER, REMOVING SAID SOOT-FOAM-FLOC LAYER, AND RERECOVERING THE CLARIFIED WATER SUBSTANTIALLY FREE OF CARBON.
References Cited (Backward Citations)
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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) | 1958-12-05 | 1959-06-06 | 1959-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-05 | 1963-06-06 | 1963-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-05 | 1967-06-06 | 1967-12-06 | $7700.00 | Window Closed / Lapsed |