US2472445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for treating oil and gas bearing strata
Assignee: THERMACTOR Co
•
Filing: 1945-02-02
•
Granted: 1949-06-07
•
Expires: 1965-02-02
Abstract
No abstract record available.
Inventors
- 👤 Osborn Katharine Sprong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:53
CPC Classifications
E; E21; E21B; E21B36/00; E21B36/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1309721A
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US1854322A
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US2244256A
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US2281334A
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US2302774A
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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) | 1952-06-06 | 1952-12-06 | 1953-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-06 | 1956-12-06 | 1957-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-06 | 1960-12-06 | 1961-06-07 | $7700.00 | Window Closed / Lapsed |