Patent US3408293A successfully refreshed from Google Patents.
US3408293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coal slurry clarification
Assignee: ChampionX LLC
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Filing: 1966-04-11
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Granted: 1968-10-29
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Expires: 1986-04-11
Abstract
No abstract record available.
Inventors
- 👤 Mahmoud T Dajani
- 👤 John D Ingraham
- 👤 Walter F Lorenc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:19
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/52; C02F1/54
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A PROCESS FOR REMOVING COAL FINES AND CLAY FROM AN AQUEOUS SUSPENSION THEREOF COMPRISING THE SEQUENTIAL ADDITION OF AN ANIONIC POLYMER FOLLOWED BY A CATIONIC POLYMER, WHEREIN THE AMOUNT OF ANIONIC POLYMER IS SUFFICIENT TO FORM A FLOC, BUT INSUFFICIENT TO AGGLOMERATE SAID FLOC INTO RAPIDLY-SETTLING PARTICLES, AND WHEREIN THE AMOUNT OF CATIONIC POLYMER IS SUFFICIENT TO BALANCE THE PRODUCT OF THE AMOUNT OF CLAY MULTIPLIED BY THE CRITICAL MOBILITY THEREOF, AND THEREAFTER ALLOWING SAID COAL FINES AND SAID CLAY TO SETTLE FROM SAID SUSPENSION TO PROVIDE A CLEAR AQUEOUS SUPERNATE.
Claim 2
Dependent Claim
91 words
A PROCESS FOR REMOVING COAL FINES AND CLAY FROM AN AQUEOUS SUSPENSION THEREOF COMPRISING THE SEQUENTIAL ADDITION OF AN ANIONIC POLYMER FOLLOWED BY A CATIONIC POLYMER, WHEREIN THE AMOUNT OF ANIONIC POLYMER IS SUFFICIENT TO FORM A FLOC, BUT INSUFFICIENT TO AGGLOMERATE SAID FLOC INTO RAPIDLY-SETTLING PARTICLES, AND WHEREIN THE AMOUNT OF CATIONIC POLYMER IS SUFFICIENT TO BALANCE THE PRODUCT OF THE AMOUNT OF CLAY MULTIPLIED BY THE CRITICAL MOBILITY THEREOF, AND THEREAFTER ALLOWING SAID COAL FINES AND SAID CLAY TO SETTLE FROM SAID SUSPENSION TO PROVIDE A CLEAR AQUEOUS SUPERNATE.
References Cited (Backward Citations)
CA637703A
Cited
US3259570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |