US3040808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for perforating oil wells
Assignee: Otis Engineering Corp
•
Filing: 1959-02-17
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Granted: 1962-06-26
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Expires: 1979-02-17
Abstract
No abstract record available.
Inventors
- 👤 Schramm Josephine
- 👤 Clarence P Liebert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:24
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B23/00; E21B23/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2304408A
Cited
US2859697A
Cited
US2879848A
Cited
US2805718A
Cited
US2785754A
Cited
US2810440A
Cited
US2810442A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-25 | 1965-12-25 | 1966-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-25 | 1969-12-25 | 1970-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-25 | 1973-12-25 | 1974-06-26 | $7700.00 | Window Closed / Lapsed |