US2156259A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Seismic-electric prospecting by means of continued waves
Assignee: Standard Oil Development Co
•
Filing: 1934-12-22
•
Granted: 1939-05-02
•
Expires: 1954-12-22
Abstract
No abstract record available.
Inventors
- 👤 Ludwig W Blau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:50
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/265; G01V11/00; G01V11/007; Y; Y02; Y02A; Y02A90/00; Y02A90/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1942-05-01 | 1942-10-31 | 1943-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-05-01 | 1946-10-31 | 1947-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-05-01 | 1950-10-31 | 1951-05-02 | $7700.00 | Window Closed / Lapsed |