US3147446A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized drift compensated direct current amplifier
Assignee: Dynamics Corp of America
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Filing: 1960-04-21
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Granted: 1964-09-01
•
Expires: 1980-04-21
Abstract
No abstract record available.
Inventors
- 👤 Roland C Wittenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:57
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/303
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
IN A STABILIZED DIRECT CURRENT AMPLIFIER SYSTEM HAVING FIRST AND SECOND INPUTS AND AN OUTPUT CIRCUIT, A BALANCING CIRCUIT COMPRISING IN COMBINATION FIRST AND SECOND SERIESCONNECTED RESISTORS, ONE END OF SAID SERIES-CONNECTED RESISTORS BEING COUPLED TO ONE OF THE INPUTS OF SAID STABILIZED DIRECT CURRENT AMPLIFIER SYSTEM, AN ALTERNATING CURRENT AMPLIFIER HAVING AN INPUT COUPLED TO THE OTHER END OF SAID SERIES-CONNECTED RESISTORS, FILTER MEANS COUPLED TO THE OUTPUT OF SAID ALTERNATING CURRENT AMPLIFIER, RELAY CHOPPER MEANS HAVING FIRST AND SECOND STATIONARY CONTACTS CONNECTED RESPECTIVELY TO THE INPUT AND OUTPUT OF SAID ALTERNATING CURRENT AMPLIFIER, SAID RELAY CHOPPER MEANS FURTHER HAVING A MOVABLE CONTACT CONNECTED TO A COMMON REFERENCE POINT, FEEDBACK CAPACITOR MEANS COUPLED BETWEEN THE OUTPUT OF SAID FILTER MEANS AND THE JUNCTION BETWEEN SAID FIRST AND SECOND SERIES-CONNECTED RESISTORS, AND MEANS COUPLING THE OUTPUT OF SAID FILTER MEANS TO THE OTHER INPUT OF SAID STABILIZED DIRECT CURRENT AMPLIFIER SYSTEM.
Claim 2
Dependent Claim
151 words
IN A STABILIZED DIRECT CURRENT AMPLIFIER SYSTEM HAVING FIRST AND SECOND INPUTS AND AN OUTPUT CIRCUIT, A BALANCING CIRCUIT COMPRISING IN COMBINATION FIRST AND SECOND SERIESCONNECTED RESISTORS, ONE END OF SAID SERIES-CONNECTED RESISTORS BEING COUPLED TO ONE OF THE INPUTS OF SAID STABILIZED DIRECT CURRENT AMPLIFIER SYSTEM, AN ALTERNATING CURRENT AMPLIFIER HAVING AN INPUT COUPLED TO THE OTHER END OF SAID SERIES-CONNECTED RESISTORS, FILTER MEANS COUPLED TO THE OUTPUT OF SAID ALTERNATING CURRENT AMPLIFIER, RELAY CHOPPER MEANS HAVING FIRST AND SECOND STATIONARY CONTACTS CONNECTED RESPECTIVELY TO THE INPUT AND OUTPUT OF SAID ALTERNATING CURRENT AMPLIFIER, SAID RELAY CHOPPER MEANS FURTHER HAVING A MOVABLE CONTACT CONNECTED TO A COMMON REFERENCE POINT, FEEDBACK CAPACITOR MEANS COUPLED BETWEEN THE OUTPUT OF SAID FILTER MEANS AND THE JUNCTION BETWEEN SAID FIRST AND SECOND SERIES-CONNECTED RESISTORS, AND MEANS COUPLING THE OUTPUT OF SAID FILTER MEANS TO THE OTHER INPUT OF SAID STABILIZED DIRECT CURRENT AMPLIFIER SYSTEM.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |