US3588374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Receiver for signalling signals of a frequency lying in the speech-frequency band
Assignee: US Philips Corp
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Filing: 1969-03-27
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Granted: 1971-06-28
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Expires: 1989-03-27
Abstract
Abstract A DEVICE WHICH RESPONDS TO A TONE CONTROL SIGNAL HAS A CIRCUIT WHICH REDUCES THE SENSITIVITY OF THE CIRCUIT TO THE TONE SIGNAL IF AN INTERFERING SIGNAL SUCH AS SPEECH OCCURS. IN ADDITION, THE SENSITIVITY IS ALSO REDUCED IF THE SPEECH SIGNAL CONTAINS A TONE BURST SIGNAL.
Inventors
- 👤 Gerrit Hendrik Van Hensbergen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:03
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/44; H04Q1/444; H04Q1/45; H04Q1/453
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |