US2581070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formation tester
Assignee: Standard Oil Development Co
•
Filing: 1948-02-06
•
Granted: 1952-01-01
•
Expires: 1968-02-06
Abstract
No abstract record available.
Inventors
- 👤 Robert H Blood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:44
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/084; E21B33/00; E21B33/10; E21B33/12; E21B33/127; E21B49/081; E21B49/082
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |