US2658724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Warning system for controlled rotary drilling
Assignee: Individual
•
Filing: 1949-05-23
•
Granted: 1953-11-10
•
Expires: 1969-05-23
Abstract
No abstract record available.
Inventors
- 👤 Arps Jan Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:30
CPC Classifications
E; E21; E21B; E21B12/00; E21B12/02; E21B47/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1790995A
Cited
US1663677A
Cited
US2338174A
Cited
US2468905A
Cited
US2555314A
Cited
US2462241A
Cited
US2554476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |