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US2639770A
Expired / Lapsed
US
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Small gun for perforating casing in oil wells
Assignee: Standard Oil Development Co
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Filing: 1950-09-11
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Granted: 1953-05-26
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Expires: 1970-09-11
Abstract
No abstract record available.
Inventors
- 👤 Theodore A Huber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:42
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)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |