US2550005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well logging method and apparatus utilizing periodically variable spontaneous potentials
Assignee: Schlumberger Well Surveying Corp
•
Filing: 1948-04-22
•
Granted: 1951-04-24
•
Expires: 1968-04-22
Abstract
No abstract record available.
Inventors
- 👤 Doll Henri-Georges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:41
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/265
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2167066A
Cited
US2190686A
Cited
US2317039A
Cited
US2304051A
Cited
US2347615A
Cited
US2433746A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |