US3268239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater wellhead assemblies
Assignee: Armco Inc
•
Filing: 1963-08-19
•
Granted: 1966-08-23
•
Expires: 1983-08-19
Abstract
No abstract record available.
Inventors
- 👤 Edward E Castor
- 👤 Michael A Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:28
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/043
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2104180A
Cited
US2138342A
Cited
US2337221A
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US3086590A
Cited
GB860914A
Cited
US3171674A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |