US2931628A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Weight control unit system for drilling rigs
Assignee: JOHN H LUCAS
•
Filing: 1956-12-31
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Granted: 1960-04-05
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Expires: 1976-12-31
Abstract
No abstract record available.
Inventors
- 👤 Wayne W Simmonds
- 👤 Arlie J Simmonds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:44
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/084
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) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |