US3130370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit system for preventing interfering radiation from transistor superheterodyne receivers
Assignee: Japan Broadcasting Corp
•
Filing: 1960-11-22
•
Granted: 1964-04-21
•
Expires: 1980-11-22
Abstract
No abstract record available.
Inventors
- 👤 Kondo Yasuaki
- 👤 Takahashi Makoto
- 👤 Ichikawa Akira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:07
CPC Classifications
H; H04; H04B; H04B15/00; H04B15/02; H04B15/04; H04B15/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
A CIRCUIT FOR REDUCING INTERFERING LOCAL OSCILLATION RADIATION IN SUPERHETERODYNE TRANSISTOR RECEIVERS, COMPRISING A TRANSISTOR AMPLIFYING STAGE, A FREQUENCY MIXER STAGE INCLUDING A TRANSISTOR HAVING AN INPUT ELECTRODE AND A PAIR OF FURTHER ELECTRODES, MEANS FOR COUPLING OUTPUT SIGNALS DEVELOPED BY SAID AMPLIFYING STAGE TO SAID FREQUENCY MIXER STAGE, A LOCAL OSCILLATOR CONNECTED TO SUPPLY LOCAL OSCILLATIONS TO ONE OF SAID PAIR OF ELECTRODES OF SAID FREQUENCY MIXER STAGE TRANSISTOR, A BIAS NETWORK CONNECTING SAID INPUT ELECTRODE OF SAID CONVERTER STAGE TRANSISTOR TO A REFERENCE POTENTIAL THROUGH AT LEAST A PART OF SAID MEANS FOR COUPLING WHEREBY LOCAL OSCILLATOR SIGNALS ARE INDUCED IN SAID BIAS NETWORK THROUGH AT LEAST THE INTERELECTRODE CAPACITY OF SAID MIXER STAGE TRANSISTOR, AND A CAPACITOR FOR COUPLING LOCAL OSCILLATOR SIGNALS DEVELOPED IN SAID BIAS NETWORK TO AN INPUT CIRCUIT OF SAID AMPLIFIER STAGE.
Claim 2
Dependent Claim
138 words
A CIRCUIT FOR REDUCING INTERFERING LOCAL OSCILLATION RADIATION IN SUPERHETERODYNE TRANSISTOR RECEIVERS, COMPRISING A TRANSISTOR AMPLIFYING STAGE, A FREQUENCY MIXER STAGE INCLUDING A TRANSISTOR HAVING AN INPUT ELECTRODE AND A PAIR OF FURTHER ELECTRODES, MEANS FOR COUPLING OUTPUT SIGNALS DEVELOPED BY SAID AMPLIFYING STAGE TO SAID FREQUENCY MIXER STAGE, A LOCAL OSCILLATOR CONNECTED TO SUPPLY LOCAL OSCILLATIONS TO ONE OF SAID PAIR OF ELECTRODES OF SAID FREQUENCY MIXER STAGE TRANSISTOR, A BIAS NETWORK CONNECTING SAID INPUT ELECTRODE OF SAID CONVERTER STAGE TRANSISTOR TO A REFERENCE POTENTIAL THROUGH AT LEAST A PART OF SAID MEANS FOR COUPLING WHEREBY LOCAL OSCILLATOR SIGNALS ARE INDUCED IN SAID BIAS NETWORK THROUGH AT LEAST THE INTERELECTRODE CAPACITY OF SAID MIXER STAGE TRANSISTOR, AND A CAPACITOR FOR COUPLING LOCAL OSCILLATOR SIGNALS DEVELOPED IN SAID BIAS NETWORK TO AN INPUT CIRCUIT OF SAID AMPLIFIER STAGE.
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) | 1967-04-21 | 1967-10-21 | 1968-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-21 | 1971-10-21 | 1972-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-21 | 1975-10-21 | 1976-04-21 | $7700.00 | Window Closed / Lapsed |