US2820138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Relay station for transmitting frequency modulated signals
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1954-10-06
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Granted: 1958-01-14
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Expires: 1974-10-06
Abstract
No abstract record available.
Inventors
- 👤 Haard Hans Bertil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:18
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/02; H03C3/08; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/155; H04B7/165
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2148532A
Cited
US2407212A
Cited
GB653288A
Cited
US2659813A
Cited
US2614211A
Cited
US2777054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |