US2796833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Perforating devices
Assignee: Individual
•
Filing: 1952-05-10
•
Granted: 1957-06-25
•
Expires: 1972-05-10
Abstract
No abstract record available.
Inventors
- 👤 William G Sweetman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:33
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; F; F42; F42B; F42B1/00; F42B1/02; F42B1/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2252996A
Cited
US2358951A
Cited
US2592434A
Cited
GB574132A
Cited
GB573078A
Cited
US2440568A
Cited
FR1002092A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-06-24 | 1960-12-24 | 1961-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-06-24 | 1964-12-24 | 1965-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-06-24 | 1968-12-24 | 1969-06-25 | $7700.00 | Window Closed / Lapsed |