US2749394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for amplification of both voice and signalling voltages
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1952-04-11
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Granted: 1956-06-05
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Expires: 1972-04-11
Abstract
No abstract record available.
Inventors
- 👤 Person Lars Bernhard
- 👤 Sivers Carl Henric Von
- 👤 Wado Kurt Reid
- 👤 Wickman Klas Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:12
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/442; H04Q1/4426
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2215777A
Cited
US2222933A
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US2296626A
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US2273432A
Cited
US2428363A
Cited
US2548901A
Cited
US2529459A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |