US2423591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making geophysical surveys under water
Assignee: Individual
•
Filing: 1942-03-07
•
Granted: 1947-07-08
•
Expires: 1962-03-07
Abstract
No abstract record available.
Inventors
- 👤 John W Flude
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:17
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/38; G01V1/3843; Y; Y02; Y02A; Y02A90/00; Y02A90/30
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1315122A
Cited
US737866A
Cited
US964380A
Cited
US1287908A
Cited
US1594069A
Cited
US1470733A
Cited
US1980993A
Cited
US2241428A
Cited
US2331363A
Cited
US2300565A
Cited
US2283200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-07 | 1951-01-06 | 1951-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-07 | 1955-01-06 | 1955-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-07 | 1959-01-06 | 1959-07-08 | $7700.00 | Window Closed / Lapsed |