Patent US2490595A successfully refreshed from Google Patents.
US2490595A
Expired / Lapsed
US
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Hydrophone
Assignee: Shell Development Co
•
Filing: 1947-06-16
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Granted: 1949-12-06
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Expires: 1967-06-16
Abstract
No abstract record available.
Inventors
- 👤 Merten Eugen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:44
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1557048A
Cited
DE556194C
Cited
US2069242A
Cited
US2311079A
Cited
US2372056A
Cited
US2405179A
Cited
US2411865A
Cited
US2423970A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-05 | 1953-06-06 | 1953-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-05 | 1957-06-06 | 1957-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-05 | 1961-06-06 | 1961-12-06 | $7700.00 | Window Closed / Lapsed |