Patent US3325706A successfully refreshed from Google Patents.
US2785755A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Storm choke for oil wells
Assignee: Gulf Research and Development Co
•
Filing: 1954-10-19
•
Granted: 1957-03-19
•
Expires: 1974-10-19
Abstract
No abstract record available.
Inventors
- 👤 Dean Howard J En
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:13
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/10; E21B35/00; E21B43/00; E21B43/14; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723; Y10T137/7726; Y10T137/7727
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-18 | 1960-09-17 | 1961-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-18 | 1964-09-17 | 1965-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-18 | 1968-09-17 | 1969-03-19 | $7700.00 | Window Closed / Lapsed |