US3309465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereophonic broadcast receiver circuit arrangement for systems operating with pilotignals
Assignee: Loewe Opta GmbH
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Filing: 1965-03-12
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Granted: 1967-03-14
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Expires: 1985-03-12
Abstract
No abstract record available.
Inventors
- 👤 Frank Egon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:39
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/1646
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
FM MULTIPLEX STEREOPHONIC RECEIVER FOR SYSTEMS OPERATING WITH PILOT SIGNALS COMPRISING AN IF-AMPLIFIER, ELECTRONIC COUPLING ELEMENTS FOLLOWED BY FILTER CIRCUITS IN SAID IF-AMPLIFIER, A DECODER CONNECTED IN SERIES TO SAID IF-AMPLIFIER, MEANS FOR PRODUCING AUTOMATICALLY A CONTROL VOLTAGE DEPENDENT ON THE PRESENCE OF A PILOT SIGNAL WITHIN SAID DECODER AND FOR APPLYING SAID CONTROL VOLTAGE TO SAID ELECTRONIC COUPLING ELEMENTS, SAID CONTROL VOLTAGE BEING ADAPTED TO CHANGE OVER THE BAND WIDTH OF SAID FILTER CIRCUITS, THUS ENABLING THE TRANSMISSION OF A WIDENED FREQUENCY BAND IN CASE OF STEREO SIGNALS.
Claim 2
Dependent Claim
89 words
FM MULTIPLEX STEREOPHONIC RECEIVER FOR SYSTEMS OPERATING WITH PILOT SIGNALS COMPRISING AN IF-AMPLIFIER, ELECTRONIC COUPLING ELEMENTS FOLLOWED BY FILTER CIRCUITS IN SAID IF-AMPLIFIER, A DECODER CONNECTED IN SERIES TO SAID IF-AMPLIFIER, MEANS FOR PRODUCING AUTOMATICALLY A CONTROL VOLTAGE DEPENDENT ON THE PRESENCE OF A PILOT SIGNAL WITHIN SAID DECODER AND FOR APPLYING SAID CONTROL VOLTAGE TO SAID ELECTRONIC COUPLING ELEMENTS, SAID CONTROL VOLTAGE BEING ADAPTED TO CHANGE OVER THE BAND WIDTH OF SAID FILTER CIRCUITS, THUS ENABLING THE TRANSMISSION OF A WIDENED FREQUENCY BAND IN CASE OF STEREO SIGNALS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |