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US2495705A
Expired / Lapsed
US
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Multiple frequency telegraph system
Assignee: International Standard Electric Corp
•
Filing: 1947-05-13
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Granted: 1950-01-31
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Expires: 1967-05-13
Abstract
No abstract record available.
Inventors
- 👤 Devaux Lucien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:10
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1508870A
Cited
US1805867A
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US2139079A
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US1960021A
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US1923724A
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US2356534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-30 | 1953-08-01 | 1954-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-30 | 1957-08-01 | 1958-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-30 | 1961-08-01 | 1962-01-31 | $7700.00 | Window Closed / Lapsed |