Patent US2452068A successfully refreshed from Google Patents.
US2452068A
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US
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Sound pickup device
Assignee: Submarine Signal Co
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Filing: 1943-01-23
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Granted: 1948-10-26
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Expires: 1963-01-23
Abstract
No abstract record available.
Inventors
- 👤 Robert E Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:17
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/30; F; F41; F41G; F41G7/00; F41G7/20; F41G7/22; F41G7/2273; F41G7/228; F42; F42B; F42B19/00; F42B19/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE297996C
Cited
US1137222A
Cited
US1121563A
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US1471547A
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US1472558A
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GB279878A
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US2138036A
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US2181132A
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US2166162A
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US2216949A
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US2283285A
Cited
GB546202A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-26 | 1952-04-26 | 1952-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-26 | 1956-04-26 | 1956-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-26 | 1960-04-26 | 1960-10-26 | $7700.00 | Window Closed / Lapsed |