US2897895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blowout closure device pressure head
Assignee: Jersey Production Research Co
•
Filing: 1956-03-30
•
Granted: 1959-08-04
•
Expires: 1976-03-30
Abstract
No abstract record available.
Inventors
- 👤 John E Ortloff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:13
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/043; E21B33/0422; E21B33/06; Y; Y10; Y10S; Y10S285/00; Y10S285/92
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1455731A
Cited
US1802565A
Cited
US2462348A
Cited
US2522171A
Cited
US2552901A
Cited
US2692066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |