Patent US2399211A successfully refreshed from Google Patents.
US2399211A
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US
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Method of perforating well casings
Assignee: EIDP Inc
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Filing: 1942-03-19
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Granted: 1946-04-30
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Expires: 1962-03-19
Abstract
No abstract record available.
Inventors
- 👤 Clyde O Davis
- 👤 Lawton A Burrows
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:55
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/08; E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/117; F42B1/00; F42B1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-04-29 | 1949-10-29 | 1950-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-04-29 | 1953-10-29 | 1954-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-04-29 | 1957-10-29 | 1958-04-30 | $7700.00 | Window Closed / Lapsed |