US3242989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the extraction of underground bituminous deposits
Assignee: Wintershall Dea International AG
•
Filing: 1962-08-06
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Granted: 1966-03-29
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Expires: 1982-08-06
Abstract
No abstract record available.
Inventors
- 👤 Schlicht Erika Marie
- 👤 Lange Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:25
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/30; E21B34/00; E21B34/06; E21B34/12; E21B36/00; E21B43/16; E21B43/24; E21B43/2403
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
IN AN ARRANGEMENT FOR THE EXTRACTION OF UNDERGROUND HIGHLY VICOUS BITUMINOUS DEPOSTIS, THE COMBINATION OF A CENTER CASING AND A PAIR OF INNER AND OUTER CONCENTRIC TUBULAR CASINGS EXTENDING INTO AN UNDERGROUND BITUMINOUS DEPOSIT, A SOURCE OF HEAT ENERGY CONNECTED TO THE CENTER CASING ADJACENT THE LOWER END THEREOF, MEANS DEFINING A PLURALITY OF PASSAGES VERTICALLY SPACED IN SAID OUTER CASING AND STAGGEREDLY POSITIONED THEREON, ROTARY VALVE MEANS FOR SELECTIVELY OPENING AND CLOSING SAID PASSAGES, A PERMEABLE LAYER OF SOLID MATERIAL ON
Claim 2
Dependent Claim
82 words
IN AN ARRANGEMENT FOR THE EXTRACTION OF UNDERGROUND HIGHLY VICOUS BITUMINOUS DEPOSTIS, THE COMBINATION OF A CENTER CASING AND A PAIR OF INNER AND OUTER CONCENTRIC TUBULAR CASINGS EXTENDING INTO AN UNDERGROUND BITUMINOUS DEPOSIT, A SOURCE OF HEAT ENERGY CONNECTED TO THE CENTER CASING ADJACENT THE LOWER END THEREOF, MEANS DEFINING A PLURALITY OF PASSAGES VERTICALLY SPACED IN SAID OUTER CASING AND STAGGEREDLY POSITIONED THEREON, ROTARY VALVE MEANS FOR SELECTIVELY OPENING AND CLOSING SAID PASSAGES, A PERMEABLE LAYER OF SOLID MATERIAL ON
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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) | 1969-03-28 | 1969-09-27 | 1970-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-03-28 | 1973-09-27 | 1974-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-03-28 | 1977-09-27 | 1978-03-29 | $7700.00 | Window Closed / Lapsed |