Patent US2930137A successfully refreshed from Google Patents.
US2930137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Earth borehole crookedness detection and indication
Assignee: Individual
•
Filing: 1954-08-04
•
Granted: 1960-03-29
•
Expires: 1974-08-04
Abstract
No abstract record available.
Inventors
- 👤 Jan J Arps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:23
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
FR480110A
Cited
GB191514780A
Cited
US1746562A
Cited
US1963090A
Cited
US2425868A
Cited
US2303360A
Cited
US2190950A
Cited
US2329732A
Cited
US2388141A
Cited
US2524031A
Cited
US2729784A
Cited
US2792637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |