US3320532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Logarithmic micro-microammeter having field effect transistor in feedback path
Assignee: General Electric Co
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Filing: 1963-07-23
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Granted: 1967-05-16
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Expires: 1983-07-23
Abstract
No abstract record available.
Inventors
- 👤 Robert L Watters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:35
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/34; H03F3/343; H03F3/345; H03F3/3455; G; G01; G01R; G01R15/00; G01R15/005; G01R19/00; G01R19/0023; G06; G06G; G06G7/00; G06G7/12; G06G7/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
112 words
A LOGARITHMIC MICRO-MICROAMMETER COMPRISING: A SUBSTANTIALLY LINEAR AMPLIFIER HAVING INPUT MEANS AND OUTPUT MEANS; A NEGATIVE FEEDBACK CIRCUIT INCLUDING A FIELD EFFECT TRANSISTOR HAVING AT LEAST ONE SEMICONDUCTIVE JUNCTION CONNECTED IN SERIES CIRCUIT FROM SAID OUTPUT MEANS TO SAID INPUT MEANS, SAID FIELD EFFECT TRANSISTOR BEING CONNECTED TO FORWARD BIAS SAID JUNCTION; LOAD IMPEDANCE MEANS CONNECTED TO SAID FIELD EFFECT TRANSISTOR, SAID LOAD IMPEDANCE MEANS HAVING AN IMPEDANCE LESS THAN THE INPUT IMPEDANCE OF SAID LINEAR AMPLIFIER; MEANS ADAPTED TO CONNECT A SOURCE OF CURRENT TO BE MEASURED TO SAID INPUT MEANS; AND MEANS COUPLED TO SAID LOAD IMPEDANCE MEANS FOR INDICATING THE MAGNITUDE OF CURRENT FLOWING THROUGH SAID LOAD IMPEDANCE MEANS.
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) | 1970-05-15 | 1970-11-14 | 1971-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-15 | 1974-11-14 | 1975-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-15 | 1978-11-14 | 1979-05-16 | $7700.00 | Window Closed / Lapsed |