Patent US3564444A successfully refreshed from Google Patents.
US3564444A
Expired / Lapsed
US
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High gain variable current source
Assignee: Unisys Corp
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Filing: 1966-02-21
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Granted: 1971-02-16
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Expires: 1986-02-21
Abstract
Abstract THIS INVENTION RELATES GENERALLY TO CIRCUITS FOR SUPPLYING A CONTROLLABLE CURRENT TO A LOAD, AND, MORE PARTICULARLY, TO HIGH GAIN DIFFERENTIAL AMPLIFIER CIRCUITS WHICH SUPPLY A CONTROLLABLE CURRENT TO A LOAD, THE MAGNITUDE OF THE CURRENT BEING INDEPENDENT OF THE VALVE OF LOAD IMPEDANCE.
Inventors
- 👤 William J Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:47
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/34; H03F3/343; G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/561; H03F1/00; H03F1/34
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |