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 10:57
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR480110A
Cited
GB191514780A
Cited
US1746562A
Cited
US1963090A
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US2425868A
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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 |