Patent US3757840A successfully refreshed from Google Patents.
Patent US4057485A successfully refreshed from Google Patents.
US4057485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction of oil from tar sands utilizing a chlorinated ethane solvent
Assignee: Individual
•
Filing: 1976-08-23
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Granted: 1977-11-08
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Expires: 1996-08-23
Abstract
Abstract Oil is efficiently solvent extracted from tar sands utilizing a trichloroethane solvent at mild conditions. The process preferably utilizes minor amounts of surfactant and polyelectrolytes. The process has resulted in unexpectedly high yields of oil with unexpectedly low solvent loss.
Inventors
- 👤 Neil Franklin Blaine, deceased
- 👤 executrix by Geneva Blaine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:18
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
46 words
In an oil solvent extraction process wherein a tar sand is contacted with a solvent at mild conditions of temperatures from 70° F. to about 800° F. and pressures of 0 to about 200 psig, the improvement wherein said solvent is monochloroethane, dichloroethane, trichloroethane or tetrachloroethane.
Claim 2
Dependent Claim
46 words
In an oil solvent extraction process wherein a tar sand is contacted with a solvent at mild conditions of temperatures from 70° F. to about 800° F. and pressures of 0 to about 200 psig, the improvement wherein said solvent is monochloroethane, dichloroethane, trichloroethane or tetrachloroethane.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein the solvent is trichloroethane or tetrachloroethane.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein the solvent is trichloroethane.
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) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |