US3372338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio communication receiver with standby control and warning circuit
Assignee: Hitachi Ltd
•
Filing: 1964-05-26
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Granted: 1968-03-05
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Expires: 1984-05-26
Abstract
No abstract record available.
Inventors
- 👤 Kubota Takashi
- 👤 Yamazaki Seishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:12
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/02; H03F1/0205; H03F1/0261
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
IN A RADIO COMMUNICATION APPARATUS, A RECEIVER CIRCUIT COMPRISING A FREQUENCY CONVERTER, AN INTERMEDIATEFREQUENCY AMPLIFIER TRANSISTOR CONNECTED TO SAID FREQUENCY CONVERTER, MEANS FOR APPLYING AUTOMATIC GAIN-CONTROLLING VOLTAGE TO SAID INTERMEDIATE-FREQUENCY AMPLIFIER TRANSISTOR, A LOW-FREQUENCY AMPLIFIER TRANSISTOR, A TRANSISTOR POWER AMPLIFIER CONNECTED TO SAID LOW FREQUENCY AMPLIFIER TRANSISTOR, A RESISTOR THROUGH WHICH FLOWS THE EMITTER CURRENT OF SAID INTERMEDIATE-FREQUENCY AMPLIFIER TRANSISTOR AND THE EMITTER CURRENT OF SAID LOW-FREQUENCY AMPLIFIER TRANSISTOR CONCURRENTLY, MEANS FOR SELECTIVELY FEEDING BACK THE OUTPUT SIGNAL OF SAID LOW-FREQUENCY AMPLIFIER TRANSISTOR TO THE INPUT ELECTRODE THEREOF DURING THE STANBY PERIOD OF SAID RECEIVER CIRCUIT AND MEANS FOR SELECTIVELY INTERRUPTING THE BASE BIAS CURRENT OF SAID TRANSISTOR POWER AMPLIFIER DURING SAID PERIOD, THE COLLECTOR CURRENT OF SAID LOW-FREQUENCY AMPLIFIER TRANSISTOR BEING INCREASED IN RESPONSE TO DECREASE IN THE COLLECTOR CURRENT OF SAID INTERMEDIATE-FREQUENCY AMPLIFIER TRANSISTOR UPON RECEIPT OF ANY INCOMING SIGNAL FOR EFFECTING OSCILLATION OF SAID LOW-FREQUENCY AMPLIFIER TRANSISTOR, THE OUTPUT OF SAID OSCILLATION SERVING TO EXCIT SAID TRANSISTOR POWER AMPLIFIER TO AMPLIFY SAID OSCILLATION OUTPUT FOR INDICATING THAT SIGNALS ARE BEING RECEIVED.
Claim 2
Dependent Claim
174 words
IN A RADIO COMMUNICATION APPARATUS, A RECEIVER CIRCUIT COMPRISING A FREQUENCY CONVERTER, AN INTERMEDIATEFREQUENCY AMPLIFIER TRANSISTOR CONNECTED TO SAID FREQUENCY CONVERTER, MEANS FOR APPLYING AUTOMATIC GAIN-CONTROLLING VOLTAGE TO SAID INTERMEDIATE-FREQUENCY AMPLIFIER TRANSISTOR, A LOW-FREQUENCY AMPLIFIER TRANSISTOR, A TRANSISTOR POWER AMPLIFIER CONNECTED TO SAID LOW FREQUENCY AMPLIFIER TRANSISTOR, A RESISTOR THROUGH WHICH FLOWS THE EMITTER CURRENT OF SAID INTERMEDIATE-FREQUENCY AMPLIFIER TRANSISTOR AND THE EMITTER CURRENT OF SAID LOW-FREQUENCY AMPLIFIER TRANSISTOR CONCURRENTLY, MEANS FOR SELECTIVELY FEEDING BACK THE OUTPUT SIGNAL OF SAID LOW-FREQUENCY AMPLIFIER TRANSISTOR TO THE INPUT ELECTRODE THEREOF DURING THE STANBY PERIOD OF SAID RECEIVER CIRCUIT AND MEANS FOR SELECTIVELY INTERRUPTING THE BASE BIAS CURRENT OF SAID TRANSISTOR POWER AMPLIFIER DURING SAID PERIOD, THE COLLECTOR CURRENT OF SAID LOW-FREQUENCY AMPLIFIER TRANSISTOR BEING INCREASED IN RESPONSE TO DECREASE IN THE COLLECTOR CURRENT OF SAID INTERMEDIATE-FREQUENCY AMPLIFIER TRANSISTOR UPON RECEIPT OF ANY INCOMING SIGNAL FOR EFFECTING OSCILLATION OF SAID LOW-FREQUENCY AMPLIFIER TRANSISTOR, THE OUTPUT OF SAID OSCILLATION SERVING TO EXCIT SAID TRANSISTOR POWER AMPLIFIER TO AMPLIFY SAID OSCILLATION OUTPUT FOR INDICATING THAT SIGNALS ARE BEING RECEIVED.
References Cited (Backward Citations)
US2899547A
Cited
US1804526A
Cited
US2447156A
Cited
US2367327A
Cited
US2367378A
Cited
US2437876A
Cited
US3090013A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |