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Patent US3018730A successfully refreshed from Google Patents.
US3018730A
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US
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Perforating guns
Assignee: Pgac Dev Co
•
Filing: 1953-07-29
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Granted: 1962-01-30
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Expires: 1973-07-29
Abstract
No abstract record available.
Inventors
- 👤 Jacques H Castel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:47
CPC Classifications
E; E21; E21B; E21B23/00; E21B23/14; E21B43/00; E21B43/11; E21B43/116; E21B43/118
Claims Analysis
Total Claims: 0
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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) | 1965-01-29 | 1965-07-31 | 1966-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-01-29 | 1969-07-31 | 1970-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-01-29 | 1973-07-31 | 1974-01-30 | $7700.00 | Window Closed / Lapsed |