US3153203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistorized symmetrical differential alternating current amplifier
Assignee: Individual
•
Filing: 1961-06-22
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Granted: 1964-10-13
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Expires: 1981-06-22
Abstract
No abstract record available.
Inventors
- 👤 Wilhelm Carl
- 👤 Kaiser Niels Edmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:21
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/45; H03F3/45071; H03F3/45076; H03F3/45179; H03F3/45197; H03F3/26; H03F2203/00; H03F2203/45; H03F2203/45022; H03F2203/45458; H03F2203/45464
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
118 words
A DIFFERENTIAL AMPLIFIER FOR ALTERNATING CURRENT SIGNALS COMPRISING: A PAIR OF TRANSISTORS EACH HAVING EMITTER, BASE AND COLLECTOR ELECTRODES; A SOURCE OF DIRECT CURRENT; EQUAL COLLECTOR RESISTORS CONNECTED BETWEEN THE COLLECTOR ELECTRODES OF SAID TRANSISTORS AND ONE TERMINAL OF SAID SOURCE; EQUAL UNBYPASSED EMITTER RESISTORS CONNECTED BETWEEN THE EMITTER ELECTRODES OF SAID TRANSISTORS AND THE OTHER TERMINAL OF SAID SOURCE; A PAIR OF INPUT TERMINALS BETWEEN WHICH THE SIGNAL TO BE AMPLIFIED IS APPLIED; MEANS FOR SPLITTING THE INPUT SIGNAL BETWEEN SAID INPUT TERMINALS INTO TWO EQUAL MAGNITUDE OPPOSITELY PHASED COMPONENTS AND FOR APPLYING ONE COMPONENT BETWEEN THE BASE OF ONE TRANSISTOR AND SAID OTHER SOURCE TERMINAL AND THE OTHER COMPONENT BETWEEN THE BASE OF THE OTHER TRANSISTOR
Claim 2
Dependent Claim
118 words
A DIFFERENTIAL AMPLIFIER FOR ALTERNATING CURRENT SIGNALS COMPRISING: A PAIR OF TRANSISTORS EACH HAVING EMITTER, BASE AND COLLECTOR ELECTRODES; A SOURCE OF DIRECT CURRENT; EQUAL COLLECTOR RESISTORS CONNECTED BETWEEN THE COLLECTOR ELECTRODES OF SAID TRANSISTORS AND ONE TERMINAL OF SAID SOURCE; EQUAL UNBYPASSED EMITTER RESISTORS CONNECTED BETWEEN THE EMITTER ELECTRODES OF SAID TRANSISTORS AND THE OTHER TERMINAL OF SAID SOURCE; A PAIR OF INPUT TERMINALS BETWEEN WHICH THE SIGNAL TO BE AMPLIFIED IS APPLIED; MEANS FOR SPLITTING THE INPUT SIGNAL BETWEEN SAID INPUT TERMINALS INTO TWO EQUAL MAGNITUDE OPPOSITELY PHASED COMPONENTS AND FOR APPLYING ONE COMPONENT BETWEEN THE BASE OF ONE TRANSISTOR AND SAID OTHER SOURCE TERMINAL AND THE OTHER COMPONENT BETWEEN THE BASE OF THE OTHER TRANSISTOR
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) | 1967-10-13 | 1968-04-13 | 1968-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-10-13 | 1972-04-13 | 1972-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-10-13 | 1976-04-13 | 1976-10-13 | $7700.00 | Window Closed / Lapsed |