US2426657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for directional signaling
Assignee: Submarine Signal Co
•
Filing: 1942-10-12
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Granted: 1947-09-02
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Expires: 1962-10-12
Abstract
No abstract record available.
Inventors
- 👤 Williams Robert Longfellow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:05
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/35; G10K11/352; G10K11/355
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1483489A
Cited
US1360664A
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US1695483A
Cited
US1379506A
Cited
US2018497A
Cited
DE644117C
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-09-01 | 1951-03-03 | 1951-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-01 | 1955-03-03 | 1955-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-01 | 1959-03-03 | 1959-09-02 | $7700.00 | Window Closed / Lapsed |