US3459442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subsea pipe coupling apparatus
Assignee: Shell USA Inc
•
Filing: 1967-11-29
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Granted: 1969-08-05
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Expires: 1987-11-29
Abstract
No abstract record available.
Inventors
- 👤 Harry W De Yarmett
- 👤 Murray F Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:50
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/01; E21B43/0107; E21B17/00; E21B17/02; E21B17/04; E21B17/046; F; F16; F16L; F16L1/00; F16L1/26; F16L37/00; F16L37/002
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) | 1972-08-04 | 1973-02-03 | 1973-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-04 | 1977-02-03 | 1977-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-04 | 1981-02-03 | 1981-08-05 | $7700.00 | Window Closed / Lapsed |