Patent US2597261A successfully refreshed from Google Patents.
US2597261A
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Well clearing apparatus
Assignee: LLOYD W FELLER
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Filing: 1949-12-09
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Granted: 1952-05-20
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Expires: 1969-12-09
Abstract
No abstract record available.
Inventors
- 👤 Leonard H Rhoads
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:34
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/24; E21B43/2401
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1019413A
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US1190167A
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US1433871A
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US1646599A
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US1733250A
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US1787801A
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US2083732A
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US2224403A
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US2244256A
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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) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |