Patent US2833516A successfully refreshed from Google Patents.
US2833516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of driving holes in bituminous strata
Assignee: Svenska Skifferolje AB
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Filing: 1952-07-10
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Granted: 1958-05-06
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Expires: 1972-07-10
Abstract
No abstract record available.
Inventors
- 👤 Salomonsson Gosta Joha Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:20
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
THE METHOD OF DRIVING HOLES IN UNCONSOLIDATED TAR SANDS WHICH COMPRISES BURNING ORGANIC SUBSTANCES IN THE TAR IN SITU TO FORM VOLATILE PRODUCTS AND TO RELEASE SAND GRAINS FROM THE TAR SAND, AND REMOVING THE SAND GRAINS BY A STREAM OF GAS ASCENDING IN THE HOLE PRODUCED.
Claim 2
Independent Claim
47 words
THE METHOD OF DRIVING HOLES IN UNCONSOLIDATED TAR SANDS WHICH COMPRISES BURNING ORGANIC SUBSTANCES IN THE TAR IN SITU TO FORM VOLATILE PRODUCTS AND TO RELEASE SAND GRAINS FROM THE TAR SAND, AND REMOVING THE SAND GRAINS BY A STREAM OF GAS ASCENDING IN THE HOLE PRODUCED.
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) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |