US2581979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for locating well fluid loss
Assignee: California Research LLC
•
Filing: 1949-07-18
•
Granted: 1952-01-08
•
Expires: 1969-07-18
Abstract
No abstract record available.
Inventors
- 👤 Marshall B Standing
- 👤 Harry S Yaplee
- 👤 Macaulay Malcolm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:21
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/10; E21B47/113; E21B27/00; E21B27/02; G; G01; G01V; G01V3/00; G01V3/18; G01V3/20; G01V9/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |