Patent US4255249A successfully refreshed from Google Patents.
US4255249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of oil from oil sand
Assignee: Kyoshin Co Ltd
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Filing: 1979-06-22
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Granted: 1981-03-10
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Expires: 1999-06-22
Abstract
Abstract A process for the production of oil from oil sand includes adding cyclodextrin or a starch decomposition product containing cyclodextrin to oil sand to convert petroleum in the oil sand to an inclusion compound and separating and collecting petroleum alone from the inclusion compound.
Inventors
- 👤 Ichiro Shibanai
- 👤 Kouki Horikoshi
- 👤 Nobuyuki Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:21
CPC Classifications
C; C10; C10G; C10G1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A process for the production of oil from oil sand, characterized by adding cyclodextrin or a starch decomposition product containing cyclodextrin to oil sand to convert petroleum in the oil sand to an inclusion compound and separating and collecting petroleum from said inclusion compound.
Claim 2
Dependent Claim
44 words
A process for the production of oil from oil sand, characterized by adding cyclodextrin or a starch decomposition product containing cyclodextrin to oil sand to convert petroleum in the oil sand to an inclusion compound and separating and collecting petroleum from said inclusion compound.
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) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |