US3289087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image rejection circuit
Assignee: Motorola Solutions Inc
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Filing: 1963-02-07
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Granted: 1966-11-29
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Expires: 1983-02-07
Abstract
No abstract record available.
Inventors
- 👤 Birkenes Bernhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:29
CPC Classifications
H; H03; H03D; H03D7/00; H03D7/18
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
131 words
A WAVE SIGNAL RECEIVER OF A SUPERHETERODYNE TYPE HAVING AN ANTENNA INPUT NETWORK COUPLED IN A STAGE FOR TRANSLATING A RECEIVED SIGNAL, SAID STAGE INCLUDING AN AMPLIFIER TRANSISTOR, SAID NETWORK COMPRISING A FIRST INDUCTOR SERIES COUPLED WITH FIRST CAPACITOR MEANS, A SECOND INDUCTOR SERIES COUPLED WITH A SECOND CAPACITOR ACROSS AT LEAST A PORTION OF SAID FIRST CAPACITOR MEANS, SAID NETWORK HAVING A FURTHER CIRCUIT TUNABLE TO THE IMAGE OF THE RECEIVED SIGNAL INCLUDING A THIRD CAPACITOR AND A THIRD INDUCTOR SERIES COUPLED ACROSS A PORTION OF SAID FIRST CAPACITOR MEANS, SAID SECOND AND THIRD INDUCTORS BEING INDUCTIVELY COUPLED TO CANCEL IMAGE SIGNALS THEREBETWEEN, MEANS CONNECTING SAID TRANSISTOR TO SAID THIRD INDUCTOR TO APPLY SIGNALS TO SAID TRANSISTOR, AND MEANS FOR ADJUSTING THE TUNING OF SAID FIRST, SECOND AND THIRD INDUCTORS.
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) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |