Patent CA468558A successfully refreshed from Google Patents.
Patent US2854514A successfully refreshed from Google Patents.
US2854514A
Expired / Lapsed
US
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Device for transmission of audio-frequency signals and ringing signals of materially higher power
Assignee: US Philips Corp
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Filing: 1956-04-06
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Granted: 1958-09-30
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Expires: 1976-04-06
Abstract
No abstract record available.
Inventors
- 👤 Ensink Johannes
- 👤 Klaassen Anne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:06
CPC Classifications
H; H04; H04M; H04M3/00; H04M3/40; C; C08; C08F; C08F255/00; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/44; H01B3/441; H01B3/442; H04B; H04B3/00; H04B3/02; H04B3/36; H04B3/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |