Patent US5416882A successfully refreshed from Google Patents.
Patent US3203888A successfully refreshed from Google Patents.
US3203888A
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Treating athabaska sands utilizing a flotation gas
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1961-04-24
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Granted: 1965-08-31
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Expires: 1981-04-24
Abstract
No abstract record available.
Inventors
- 👤 Roger M Butler
- 👤 John L Tiedje
- 👤 John A Bichard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:04
CPC Classifications
C; C10; C10G; C10G1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
IN A PROCESS FOR THE REMOVAL OF BITUMEN FROM TAR SANDS WHEREIN A LIQUID IS MIXED WITH NATURAL TAR SANDS AND THE BITUMEN LATER RECOVERED BY A FLOTATION TECHNIQUE, THE IMPROVEMENT WHICH COMPRISES ADDING TO THE MIXTURE OF LIQUID AND TAR SANDS A HYDROCARBON GAS WHEREIN SAID GAS IS ADDED IN AN INITIAL STAGE AT AN ELEVATED PRESSURE, THE MIXTURE AGITATED AT SAID ELEVATED PRESSURE AND THEN INTRODUCED INTO A SECOND SETTLING STAGE MAINTAINED AT A LOWER PRESSURE.
Claim 2
Dependent Claim
78 words
IN A PROCESS FOR THE REMOVAL OF BITUMEN FROM TAR SANDS WHEREIN A LIQUID IS MIXED WITH NATURAL TAR SANDS AND THE BITUMEN LATER RECOVERED BY A FLOTATION TECHNIQUE, THE IMPROVEMENT WHICH COMPRISES ADDING TO THE MIXTURE OF LIQUID AND TAR SANDS A HYDROCARBON GAS WHEREIN SAID GAS IS ADDED IN AN INITIAL STAGE AT AN ELEVATED PRESSURE, THE MIXTURE AGITATED AT SAID ELEVATED PRESSURE AND THEN INTRODUCED INTO A SECOND SETTLING STAGE MAINTAINED AT A LOWER PRESSURE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-30 | 1969-03-01 | 1969-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-30 | 1973-03-01 | 1973-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-30 | 1977-03-01 | 1977-08-31 | $7700.00 | Window Closed / Lapsed |