US2614170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional coupler for polyphase networks
Assignee: FR SADIR CARPENTIER SOC
•
Filing: 1948-10-04
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Granted: 1952-10-14
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Expires: 1968-10-04
Abstract
No abstract record available.
Inventors
- 👤 Marie Pierre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:53
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2287174A
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US2400796A
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US2424156A
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US2416790A
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US2301635A
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US2369268A
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US2445895A
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US2444426A
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US2468237A
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US2495589A
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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) | 1955-10-14 | 1956-04-14 | 1956-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-14 | 1960-04-14 | 1960-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-14 | 1964-04-14 | 1964-10-14 | $7700.00 | Window Closed / Lapsed |