Patent US2859697A successfully refreshed from Google Patents.
US2859697A
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Well perforating device
Assignee: Johnston Testers Inc
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Filing: 1954-06-07
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Granted: 1958-11-11
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Expires: 1974-06-07
Abstract
No abstract record available.
Inventors
- 👤 Thomas L Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:30
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/118
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2037938A
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US2295634A
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US2307360A
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US2327340A
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US2543814A
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US2664157A
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US2705920A
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FR1029798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-10 | 1962-05-12 | 1962-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-10 | 1966-05-12 | 1966-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-10 | 1970-05-12 | 1970-11-11 | $7700.00 | Window Closed / Lapsed |