US3128604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Off shore drilling rig
Assignee: Individual
•
Filing: 1960-05-16
•
Granted: 1964-04-14
•
Expires: 1980-05-16
Abstract
No abstract record available.
Inventors
- 👤 William A Sandberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:28
CPC Classifications
E; E02; E02B; E02B17/00; E02B17/02; E02B17/027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2687017A
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US2772539A
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US2863292A
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US2995900A
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US2941369A
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US2973046A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-14 | 1967-10-14 | 1968-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-14 | 1971-10-14 | 1972-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-14 | 1975-10-14 | 1976-04-14 | $7700.00 | Window Closed / Lapsed |