US3846276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for separating bitumen from tar sand recovered from deposits by mining
Assignee: Texaco Inc
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Filing: 1973-06-18
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Granted: 1974-11-05
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Expires: 1993-06-18
Abstract
Abstract 1. A PROCESS FOR SEPARATING BITUMEN AND SAND FROM TAR SAND MATERIAL RECOVERED FROM SUBTERRANEAN DEPOSITS BY MINING COMPRISING: CONTACTING THE TAR SAND MATERIAL WITH AN AQUEOUS SOLUTION COMPRISING AN INORGANIC POLYPHOSPHATE SUBSTANCE PLUS AN ALKALINITY AGENT, THE TEMPERATURE OF SAID SOLUTION BEING GREATER THAN 100* F.
Inventors
- 👤 C Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:41
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/04; C10G1/047; C10C; C10C3/00; C10C3/007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A PROCESS FOR SEPARATING BITUMEN AND SAND FROM TAR SAND MATERIAL RECOVERED FROM SUBTERRANEAN DEPOSITS BY MINING COMPRISING: CONTACTING THE TAR SAND MATERIAL WITH AN AQUEOUS SOLUTION COMPRISING AN INORGANIC POLYPHOSPHATE SUBSTANCE PLUS AN ALKALINITY AGENT, THE TEMPERATURE OF SAID SOLUTION BEING GREATER THAN 100* F.
Claim 2
Dependent Claim
46 words
A PROCESS FOR SEPARATING BITUMEN AND SAND FROM TAR SAND MATERIAL RECOVERED FROM SUBTERRANEAN DEPOSITS BY MINING COMPRISING: CONTACTING THE TAR SAND MATERIAL WITH AN AQUEOUS SOLUTION COMPRISING AN INORGANIC POLYPHOSPHATE SUBSTANCE PLUS AN ALKALINITY AGENT, THE TEMPERATURE OF SAID SOLUTION BEING GREATER THAN 100* F.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |