US3140348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor amplifier
Assignee: Individual
•
Filing: 1961-03-21
•
Granted: 1964-07-07
•
Expires: 1981-03-21
Abstract
No abstract record available.
Inventors
- 👤 Victor H Laughter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:18
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/02; H03G3/04; H03G3/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A TRANSISTOR AMPLIFIER COMPRISING A FIRST TRANSISTOR STAGE FOR AMPLIFYING AN AUDIO SIGNAL, MEANS FOR CONNECTING THE BASE OF SAID FIRST TRANSISTOR TO A MEANS FOR COUPLING AN AUDIO SIGNAL THERETO, MEANS FOR CONNECTING THE EMITTER OF SAID FIRST STAGE TO GROUND, AN EMITTER FOLLOWER TRANSISTOR STAGE DIRECT CURRENT COUPLED TO THE COLLECTOR OF SAID FIRST TRANSISTOR STAGE, A NEGATIVE FEEDBACK CIRCUIT CONNECTED BETWEEN SAID FIRST STAGE AND SAID EMITTER FOLLOWER STAGE FOR DIRECT CURRENTS ONLY, SAID FEEDBACK CIRCUIT INCLUDING VARIABLE IMPEDANCE MEANS FOR CHANGING THE ABSOLUTE MAG-
Claim 2
Dependent Claim
88 words
A TRANSISTOR AMPLIFIER COMPRISING A FIRST TRANSISTOR STAGE FOR AMPLIFYING AN AUDIO SIGNAL, MEANS FOR CONNECTING THE BASE OF SAID FIRST TRANSISTOR TO A MEANS FOR COUPLING AN AUDIO SIGNAL THERETO, MEANS FOR CONNECTING THE EMITTER OF SAID FIRST STAGE TO GROUND, AN EMITTER FOLLOWER TRANSISTOR STAGE DIRECT CURRENT COUPLED TO THE COLLECTOR OF SAID FIRST TRANSISTOR STAGE, A NEGATIVE FEEDBACK CIRCUIT CONNECTED BETWEEN SAID FIRST STAGE AND SAID EMITTER FOLLOWER STAGE FOR DIRECT CURRENTS ONLY, SAID FEEDBACK CIRCUIT INCLUDING VARIABLE IMPEDANCE MEANS FOR CHANGING THE ABSOLUTE MAG-
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) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |