US3687845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separating tramp oils from oil-in-water emulsions
Assignee: Dow Chemical Co
•
Filing: 1970-05-15
•
Granted: 1972-08-29
•
Expires: 1990-05-15
Abstract
Abstract ACCUMULATIONS OF TRAMP OILS ARE REMOVED FROM OIL-INWATER EMULSIONS UTILIZED AS CLEANERS, LUBRICANTS AND COOLANTS BY INTRODUCING INTO THE EMULSION A SMALL BUT EFFECTIVE AMOUNT OF A HIGH MOLECULAR WEIGHT, WATER-SOLUBLE ANIONIC POLYMER AND HEATING THE TREATED EMULSION AT AN ELEVATED TEMPERATURE WHEREBY THE TRAMP OILS ARE COALESCED AND FLOATED TO THE SURFACE OF THE EMUSLION. THE ESSENTIALLY CONTINUOUS BUT DISTINCT TRAMP OIL AND EMULSION PHASES ARE THEN READILY SEPARATED.
Inventors
- 👤 Lyle G Treat
- 👤 Porter Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:33
CPC Classifications
C; C10; C10M; C10M175/00; C10M175/04; B; B01; B01D; B01D17/00; B01D17/02; B01D17/04; B01D17/047; C10G; C10G33/00; C10G33/04
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |