US2658725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal transmission system for use in logging drill hole formations
Assignee: Individual
•
Filing: 1947-10-31
•
Granted: 1953-11-10
•
Expires: 1967-10-31
Abstract
No abstract record available.
Inventors
- 👤 Arps Jan Jacob
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:00
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/34; E; E21; E21B; E21B47/00; E21B47/12; E21B47/138; G01V11/00; G01V11/002
Claims Analysis
Total Claims: 0
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US2468905A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |