US2582994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater microphone
Assignee: Geophysical Research Corp
•
Filing: 1943-06-04
•
Granted: 1952-01-22
•
Expires: 1963-06-04
Abstract
No abstract record available.
Inventors
- 👤 James M Kendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:08
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/04; B06B1/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1470733A
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US1393471A
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US1562545A
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US1892147A
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US2069254A
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US2067636A
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US2271864A
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US2241428A
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US2249131A
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US2283200A
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US2311079A
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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) | 1955-01-21 | 1955-07-23 | 1956-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-21 | 1959-07-23 | 1960-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-21 | 1963-07-23 | 1964-01-22 | $7700.00 | Window Closed / Lapsed |