Patent US2818808A successfully refreshed from Google Patents.
US2818808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Jet perforating gun
Assignee: Individual
•
Filing: 1954-04-07
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Granted: 1958-01-07
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Expires: 1974-04-07
Abstract
No abstract record available.
Inventors
- 👤 Dill Winnefred Sheldon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:08
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/117
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2733657A
Cited
US2450366A
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US2587244A
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US2669928A
Cited
US2655619A
Cited
US2586706A
Cited
US2680406A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |