Patent US3429133A successfully refreshed from Google Patents.
US3429133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Offshore tower
Assignee: Brown and Root Inc
•
Filing: 1967-04-19
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Granted: 1969-02-25
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Expires: 1987-04-19
Abstract
No abstract record available.
Inventors
- 👤 Ferdinand R Hauber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:28
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/043; E21B15/00; E21B15/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR697767A
Cited
US2496532A
Cited
FR63338E
Cited
US3014347A
Cited
US2940266A
Cited
US3138932A
Cited
US3093167A
Cited
US3209544A
Cited
US3315473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |