US3523579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subsea wellhead valve system and collet connector mechanism therefor
Assignee: ACF Industries Inc
•
Filing: 1968-11-15
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Granted: 1970-08-11
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Expires: 1988-11-15
Abstract
No abstract record available.
Inventors
- 👤 Norman A Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:36
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/02; E21B34/04; E21B33/00; E21B33/02; E21B33/03; E21B33/035; E21B33/038; E21B33/04; E21B33/047; E21B43/00; E21B43/14; F; F16; F16L; F16L39/00
Claims Analysis
Total Claims: 0
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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) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |