US2761901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for setting of selectors by means of audio-frequencies
Assignee: Telefonaktiebolaget LM Ericsson AB
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Filing: 1951-07-11
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Granted: 1956-09-04
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Expires: 1971-07-11
Abstract
No abstract record available.
Inventors
- 👤 Lundkvist Karl Axel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:45
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0008; H04Q3/0012
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2299479A
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US2303356A
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US2326478A
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US2388347A
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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) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |