US4046669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solvent extraction of oil from tar sands utilizing a trichloroethylene solvent
Assignee: Individual
•
Filing: 1976-01-19
•
Granted: 1977-09-06
•
Expires: 1996-01-19
Abstract
Abstract Oil is efficiently solvent extracted from tar sands utilizing a trichloroethylene 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
- 👤 Neal Franklin Blaine, deceased
- 👤 executrix Geneva Blaine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:02
CPC Classifications
C; C10; C10G; C10G1/00; C10G1/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
100 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 from 0 to about 200 psig, the improvement wherein said solvent is trichloroethylene and wherein said solvent is contacted with said tar sand in a contact vessel; wherein the solvent and tar is removed from the upper portion of such vessel; wherein the sand is removed from the lower portion of such vessel and wherein the solvent is removed from the extracted tar for further use in the solvent extraction process.
Claim 2
Dependent Claim
100 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 from 0 to about 200 psig, the improvement wherein said solvent is trichloroethylene and wherein said solvent is contacted with said tar sand in a contact vessel; wherein the solvent and tar is removed from the upper portion of such vessel; wherein the sand is removed from the lower portion of such vessel and wherein the solvent is removed from the extracted tar for further use in the solvent extraction process.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein the process is conducted at mild conditions of from 70° F. to 500° F. and pressures of 0 to 80 psig.
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) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |