US3209083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct-coupled transistor amplifier
Assignee: Beltone Electronics Corp
•
Filing: 1962-09-07
•
Granted: 1965-09-28
•
Expires: 1982-09-07
Abstract
No abstract record available.
Inventors
- 👤 Lawrence M Posen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:02
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/181; H03F3/183; H03F1/00; H03F1/34; H03F3/34; H03F3/343
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
THE IMPROVEMENT OF A DIRECT-COUPLED SILICON TRANSISTOR HEARING AID AMPLIFIER CIRCUIT COMPRISING THE COMBINATION OF NPN AND PNP SILICON TRANSISTORS CONNECTED TO FORM AT LEAST A THREE STAGE AMPLIFIER CIRCUIT, WITH AT LEAST THE FIRST TWO STAGES OF SAID TRANSISTORS BEING ALTERNATELY CONNECTED, EACH OFF SAID TRANSISTTORS COMPRISING EMITTER, COLLECTOR AND BASE ELECTRODES, CONDUCTOR MEANS COMPRISING A DIRECT CONNECTION FROM THE COLLECTOR ELECTRODES OF EACH TRANSISTOR TO THE BASE ELECTRODE OF THE FOLLOWING STAGE TRANSISTORS, A SOURCE OF DIRECT CURRENT POTENTIAL HAVING POSITIVE AND NEGATIVE TERMINALS CIRCUIT MEANS CONNECTING THE EMITTER ELECTRODES OF SAID NPN TRANSISTORS AND THE COLLECTOR ELECTRODES OF SAID PNP TRANSISTORS TO SAID NEGATIVE TERMINAL OF SAID SOURCE OF DIRECT CURRENT POTENTIAL, CIRCUIT MEANS CONNECTING THE COLLECTOR ELECTRODES OF SAID NPN TRANSISTORS AND THE EMITTER ELECTRODES OF SAID PNP TRAN-
Claim 2
Dependent Claim
133 words
THE IMPROVEMENT OF A DIRECT-COUPLED SILICON TRANSISTOR HEARING AID AMPLIFIER CIRCUIT COMPRISING THE COMBINATION OF NPN AND PNP SILICON TRANSISTORS CONNECTED TO FORM AT LEAST A THREE STAGE AMPLIFIER CIRCUIT, WITH AT LEAST THE FIRST TWO STAGES OF SAID TRANSISTORS BEING ALTERNATELY CONNECTED, EACH OFF SAID TRANSISTTORS COMPRISING EMITTER, COLLECTOR AND BASE ELECTRODES, CONDUCTOR MEANS COMPRISING A DIRECT CONNECTION FROM THE COLLECTOR ELECTRODES OF EACH TRANSISTOR TO THE BASE ELECTRODE OF THE FOLLOWING STAGE TRANSISTORS, A SOURCE OF DIRECT CURRENT POTENTIAL HAVING POSITIVE AND NEGATIVE TERMINALS CIRCUIT MEANS CONNECTING THE EMITTER ELECTRODES OF SAID NPN TRANSISTORS AND THE COLLECTOR ELECTRODES OF SAID PNP TRANSISTORS TO SAID NEGATIVE TERMINAL OF SAID SOURCE OF DIRECT CURRENT POTENTIAL, CIRCUIT MEANS CONNECTING THE COLLECTOR ELECTRODES OF SAID NPN TRANSISTORS AND THE EMITTER ELECTRODES OF SAID PNP TRAN-
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) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |