Patent US3351865A successfully refreshed from Google Patents.
US3351865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operational amplifier
Assignee: Westinghouse Electric Corp
•
Filing: 1964-04-01
•
Granted: 1967-11-07
•
Expires: 1984-04-01
Abstract
No abstract record available.
Inventors
- 👤 Bruce R Dow
- 👤 Richard A Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:15
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H03F3/00; H03F3/34; H03F3/343
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
AN OPERATIONAL AMPLIFIER OPERATIVE WITH DIRECT AND ALTERNATING INPUT SIGNALS AND A COMMON REFERENCE SOURCE COMPRISING, A FIRST TRANSISTOR OF A FIRST CONDUCTIVITY TYPE OPERATIVE TO RECEIVE SAID INPUT SIGNALS INCLUDING BASE, COLLECTOR AND EMITTER ELECTRODES, AND A COMBINATION TRANSISTOR OPERATIVE AS A CURRENT SOURCE AND HAVING AN ENHANCED CHARACTERISTIC AND BEING OF A SECOND CONDUCTIVITY TYPE, SAID COMBINATION TRANSISTOR INCLUDING A SECOND TRANSISTOR OF THE FIRST CONDUCTIVITY TYPE, AND A THIRD TRANSISTOR OF THE SECOND CONDUCTIVITY TYPE, EACH OF SAID SECOND AND THIRD TRANSISTORS INCLUDING BASE, COLLECTOR AND EMITTER ELECTRODES, WITH THE COLLECTOR AND BASE ELECTRODES OF SAID SECOND TRANSISTOR OPERATIVELY CONNECTED TO SAID EMITTER AND COLLECTOR ELECTRODES
Claim 2
Dependent Claim
109 words
AN OPERATIONAL AMPLIFIER OPERATIVE WITH DIRECT AND ALTERNATING INPUT SIGNALS AND A COMMON REFERENCE SOURCE COMPRISING, A FIRST TRANSISTOR OF A FIRST CONDUCTIVITY TYPE OPERATIVE TO RECEIVE SAID INPUT SIGNALS INCLUDING BASE, COLLECTOR AND EMITTER ELECTRODES, AND A COMBINATION TRANSISTOR OPERATIVE AS A CURRENT SOURCE AND HAVING AN ENHANCED CHARACTERISTIC AND BEING OF A SECOND CONDUCTIVITY TYPE, SAID COMBINATION TRANSISTOR INCLUDING A SECOND TRANSISTOR OF THE FIRST CONDUCTIVITY TYPE, AND A THIRD TRANSISTOR OF THE SECOND CONDUCTIVITY TYPE, EACH OF SAID SECOND AND THIRD TRANSISTORS INCLUDING BASE, COLLECTOR AND EMITTER ELECTRODES, WITH THE COLLECTOR AND BASE ELECTRODES OF SAID SECOND TRANSISTOR OPERATIVELY CONNECTED TO SAID EMITTER AND COLLECTOR ELECTRODES
References Cited (Backward Citations)
US3024422A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-06 | 1971-05-08 | 1971-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-06 | 1975-05-08 | 1975-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-06 | 1979-05-08 | 1979-11-07 | $7700.00 | Window Closed / Lapsed |