US2768684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well perforating and logging methods and apparatus
Assignee: Perforating Guns Atlas Corp
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Filing: 1952-02-20
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Granted: 1956-10-30
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Expires: 1972-02-20
Abstract
No abstract record available.
Inventors
- 👤 Jacques H Castel
- 👤 Henry C Waters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:30
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/09; E21B47/092
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) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |