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US2802990A
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Switching system in multiple line multiplex transmission system
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1954-08-02
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Granted: 1957-08-13
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Expires: 1974-08-02
Abstract
No abstract record available.
Inventors
- 👤 Eriksen Erik Jens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:28
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H03F1/54; H03F1/542
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1792496A
Cited
US2229108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |