Patent US2911206A successfully refreshed from Google Patents.
US2911206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
In situ retorting of oil shale
Assignee: Phillips Petroleum Co
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Filing: 1957-03-08
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Granted: 1959-11-03
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Expires: 1977-03-08
Abstract
No abstract record available.
Inventors
- 👤 Purre Heino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:34
CPC Classifications
E; E21; E21C; E21C41/00; E21C41/16; E21C41/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
A PROCESS OF RECOVERY OF HYDROCARBONS FROM AN IMPERMEABLE UNDERGROWN STRATUM CONTAINING SAME LYING ADJACENT A PERMEABLE STRATUM WHICH COMPRISES FORMING A TUNNEL IN THESE STRATA PARALLEL THERWITH AND AT THE SAME LEVEL EXTENDING ALONG A SUBSTANTIAL SECTION OF THE STRATA: FORMING AT LEAST ONE BOREHOLE THRU SAID STRATA SPACED FROM SAID TUNNEL; HEATING AND PRODUCING HYDROCARBONS FROM SAID IMPERMEABLE STRATUM BY INTRODUCING HOT GAS TO SAID TUNNEL AND FORCING SAME THRU THE PORES IN
Claim 2
Dependent Claim
75 words
A PROCESS OF RECOVERY OF HYDROCARBONS FROM AN IMPERMEABLE UNDERGROWN STRATUM CONTAINING SAME LYING ADJACENT A PERMEABLE STRATUM WHICH COMPRISES FORMING A TUNNEL IN THESE STRATA PARALLEL THERWITH AND AT THE SAME LEVEL EXTENDING ALONG A SUBSTANTIAL SECTION OF THE STRATA: FORMING AT LEAST ONE BOREHOLE THRU SAID STRATA SPACED FROM SAID TUNNEL; HEATING AND PRODUCING HYDROCARBONS FROM SAID IMPERMEABLE STRATUM BY INTRODUCING HOT GAS TO SAID TUNNEL AND FORCING SAME THRU THE PORES IN
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-02 | 1963-05-04 | 1963-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-02 | 1967-05-04 | 1967-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-02 | 1971-05-04 | 1971-11-03 | $7700.00 | Window Closed / Lapsed |