US3023012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Submarine drilling head and blowout preventer
Assignee: Shaffer Tool Works
•
Filing: 1959-06-09
•
Granted: 1962-02-27
•
Expires: 1979-06-09
Abstract
No abstract record available.
Inventors
- 👤 Arthur E Wilde
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:45
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/064; E21B3/00; E21B3/02; E21B3/04; E21B3/045; E21B33/068; E21B33/076; E21B33/08; E21B33/085
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US369869A
Cited
US2506538A
Cited
US661664A
Cited
US1560763A
Cited
US2333847A
Cited
US2628852A
Cited
US2886350A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-26 | 1965-08-28 | 1966-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-26 | 1969-08-28 | 1970-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-26 | 1973-08-28 | 1974-02-27 | $7700.00 | Window Closed / Lapsed |