US2452571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound signaling apparatus
Assignee: Submarine Signal Co
•
Filing: 1933-06-14
•
Granted: 1948-11-02
•
Expires: 1953-06-14
Abstract
No abstract record available.
Inventors
- 👤 Ivan C Clement
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:52
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0622; B06B1/0629
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1002567A
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US1380981A
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GB145691A
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US1624357A
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US1688694A
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US1619854A
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FR613799A
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US1866267A
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US1802782A
Cited
GB301034A
Cited
GB309276A
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US2045430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-02 | 1952-05-03 | 1952-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-02 | 1956-05-03 | 1956-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-02 | 1960-05-03 | 1960-11-02 | $7700.00 | Window Closed / Lapsed |