Patent US2613918A successfully refreshed from Google Patents.
US2613918A
Expired / Lapsed
US
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Wire line core barrel
Assignee: Johnston Testers Inc
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Filing: 1950-02-20
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Granted: 1952-10-14
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Expires: 1970-02-20
Abstract
No abstract record available.
Inventors
- 👤 Long Thomas Leonard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:11
CPC Classifications
E; E21; E21B; E21B25/00; E21B25/02; E21B25/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1617659A
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US2214551A
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US2084988A
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US2108949A
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US2140097A
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US2292838A
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US2256552A
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US2389512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-14 | 1956-04-14 | 1956-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-14 | 1960-04-14 | 1960-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-14 | 1964-04-14 | 1964-10-14 | $7700.00 | Window Closed / Lapsed |