Patent US3677962A successfully refreshed from Google Patents.
US3677962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for breaking petroleum emulsions
Assignee: Evonik Operations GmbH
•
Filing: 1970-07-13
•
Granted: 1972-07-18
•
Expires: 1990-07-13
Abstract
Abstract PROCESS FOR BREAKING PETROLEUM EMULSIONS WITH POLYOXYALKYLENE-POLYSILOXANE-MIXED BLOCKCOPOLYMERS. THE POLYOXLALKYLENE BLOCKS OF THE POLYOXYALKYLENE-POLYSILOXANE-MIXED BLOCKPOLYMERS HAVE A MOLE WEIGHT OF BETWEEN 500 TO 4000 AND CONSIST OF POLYOXYETHYLENE AND POLYOXYPROPYLENE UNITS IN A WEIGHT RATIO OF BETWEEN ABOUT 40:60 TO 100:0. THE POLYSILOXANE BLOCKS CONTAIN 3 TO 50 SILICON ATOMS PER BLOCK.
Inventors
- 👤 Gotz Koerner
- 👤 Gerd Rossmy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:43
CPC Classifications
C; C10; 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) | 1975-07-18 | 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 |