Patent US2821136A successfully refreshed from Google Patents.
US2821136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Firing system for jet type perforating gun
Assignee: P G A C DEV CO
•
Filing: 1951-04-05
•
Granted: 1958-01-28
•
Expires: 1971-04-05
Abstract
No abstract record available.
Inventors
- 👤 Jacques H Castel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:59
CPC Classifications
F; F42; F42D; F42D1/00; F42D1/04; F42D1/045; F42D1/05; F42D1/055; E; E21; E21B; E21B43/00; E21B43/11; E21B43/116; E21B43/1185
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE283902C
Cited
US2307729A
Cited
US2264450A
Cited
US2429240A
Cited
US2338872A
Cited
US2363234A
Cited
US2494256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |