US3189840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct coupled amplifier for amplifying low level information signals and rejecting interference signals
Assignee: RACAL-DANA INSTRUMENTS Inc
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Filing: 1963-02-08
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Granted: 1965-06-15
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Expires: 1983-02-08
Abstract
No abstract record available.
Inventors
- 👤 Noel B Braymer
- 👤 Charles E Engle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:25
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45479
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
IN A DIRECT COUPLED AMPLIFIER HAVING A DIFFERENTIAL FIRST STAGE INCLUDING A PAIR OF TRANSISTORS EACH HAVING AN EMITTER, A BASE AND A COLLECTOR, AN INTERFERENCE SIGNAL REJECTOR CIRCUIT INCLUDING AMPLIFIER MEANS HAVING FIRST AND SECOND INPUT TERMINALS AND FIRST AND SECOND OUTPUT TERMINALS; A SOURCE OF POTENTIAL; MEANS CONNECTING SAID SOURCE OF POTENTIAL TO SAID FIRST INPUT TERMINAL OF SAID AMPLIFIER; MEANS FOR DETECTING CHANGE IN THE SUM OF THE CURRENTS FLOWING THROUGH SAID TRANSISTORS CONNECTED TO SAID SECOND INPUT TERMINAL OF SAID AMPLIFIER THEREBY TO APPLYING A POTENTIAL INDICATIVE OF SAID SUM OF CURRENTS TO SAID SECOND INPUT TERMINAL; AND FEEDBACK MEANS CONNECTED BETWEEN SAID FIRST OUTPUT TERMINAL OF SAID AMPLIFIER MEANS AND SAID FIRST STAGE;
Claim 2
Dependent Claim
118 words
IN A DIRECT COUPLED AMPLIFIER HAVING A DIFFERENTIAL FIRST STAGE INCLUDING A PAIR OF TRANSISTORS EACH HAVING AN EMITTER, A BASE AND A COLLECTOR, AN INTERFERENCE SIGNAL REJECTOR CIRCUIT INCLUDING AMPLIFIER MEANS HAVING FIRST AND SECOND INPUT TERMINALS AND FIRST AND SECOND OUTPUT TERMINALS; A SOURCE OF POTENTIAL; MEANS CONNECTING SAID SOURCE OF POTENTIAL TO SAID FIRST INPUT TERMINAL OF SAID AMPLIFIER; MEANS FOR DETECTING CHANGE IN THE SUM OF THE CURRENTS FLOWING THROUGH SAID TRANSISTORS CONNECTED TO SAID SECOND INPUT TERMINAL OF SAID AMPLIFIER THEREBY TO APPLYING A POTENTIAL INDICATIVE OF SAID SUM OF CURRENTS TO SAID SECOND INPUT TERMINAL; AND FEEDBACK MEANS CONNECTED BETWEEN SAID FIRST OUTPUT TERMINAL OF SAID AMPLIFIER MEANS AND SAID FIRST STAGE;
References Cited (Backward Citations)
US3046487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |