US3556982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination additive for tar sand processing
Assignee: Petro Canada Exploration Inc
•
Filing: 1968-06-26
•
Granted: 1971-01-19
•
Expires: 1988-06-26
Abstract
Abstract A TAR SAND ADDITIVE IS DISCLOSED WHICH COMPRISES A MIXTURE OF SODIUM HYDROXIDE AND SODIUM TRIPOLYPHOSPHATE. THE ADDITIVE IS ESPECIALLY USEFUL IN A PROCESS FOR RECOVERING BITUMEN FROM BITUMINOIS SANDS BY AQUEOUS EXTRACTION, WHEN THE SODIUM TRIPOLYPHOSPHATE AND THE SODIUM HYDROXIDE ARE EACH PRESENT IN AMOUNTS FROM ABOUT 0.005 TO 0.1% BY WEIGHT AND IN WHICH THE WEIGHT RATIO OF PARTS SODIUM HYDROXIDE PER PART SODIUM TRIPOLYPHOSPHATE IS FROM ABOUT 5:1 TO 1:5.
Inventors
- 👤 Victor P Kaminsky
- 👤 Clement W Bowman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:27
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/007; C10G; C10G1/00; C10G1/04; C10G1/047
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |