US2981185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well perforating apparatus
Assignee: Jet Research Center Inc
•
Filing: 1957-04-03
•
Granted: 1961-04-25
•
Expires: 1977-04-03
Abstract
No abstract record available.
Inventors
- 👤 Blake M Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:37
CPC Classifications
F; F42; F42B; F42B3/00; F42B3/02; E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/117
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1598293A
Cited
US2026061A
Cited
US2151837A
Cited
US2616370A
Cited
US2633329A
Cited
GB701074A
Cited
US2853944A
Cited
US2799224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |