US2427421A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for making and analyzing geophysical records
Assignee: Individual
•
Filing: 1940-06-22
•
Granted: 1947-09-16
•
Expires: 1960-06-22
Abstract
No abstract record available.
Inventors
- 👤 Rieber Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:01
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/28; G01V1/30
Claims Analysis
Total Claims: 0
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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) | 1950-09-15 | 1951-03-17 | 1951-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-15 | 1955-03-17 | 1955-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-15 | 1959-03-17 | 1959-09-16 | $7700.00 | Window Closed / Lapsed |