US2669928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perforating device for wells
Assignee: Individual
•
Filing: 1948-06-15
•
Granted: 1954-02-23
•
Expires: 1968-06-15
Abstract
No abstract record available.
Inventors
- 👤 William G Sweetman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:42
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/117; F; F42; F42B; F42B3/00; F42B3/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB134948A
Cited
GB500919A
Cited
US2156228A
Cited
US2140813A
Cited
US2233930A
Cited
US2362738A
Cited
US2399211A
Cited
US2380204A
Cited
US2494256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |