Patent US3140408A successfully refreshed from Google Patents.
US3140408A
Expired / Lapsed
US
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Switch with plural inputs to, and plural feedback paths from, an operational amplifier
Assignee: Computer Products Inc
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Filing: 1962-06-20
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Granted: 1964-07-07
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Expires: 1982-06-20
Abstract
No abstract record available.
Inventors
- 👤 Melvin M May
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:52
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/72; H03F3/68; H03G; H03G1/00; H03G1/0005; H03G1/0088; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/687; H03K17/6871; H03K5/00; H03K5/01; H03K5/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
IN AN OPERATION AMPLIFIER CIRCUIT, AN ELECTRONIC SWITCH COMPRISING AT LEAST TWO INPUT CIRCUITS LEADING IN PARALLEL TO THE INPUT TERMINAL OF A HIGH GAIN D.C. AMPLIFIER, A FEEDBACK CIRCUIT FOR EACH INPUT CIRCUIT AND CONNECTED TO THE LATTER AT A JUNCTION, A GROUNDING CIRCUIT FOR EACH INPUT CIRCUIT, A FIELD EFFECT TRANSISTOR IN EACH INPUT CIRCUIT BETWEEN SAID JUNCTION AND SAID INPUT TERMINAL OF THE AMPLIFIER, A GROUNDING TRANSISTOR IN EACH GROUNDING CIRCUIT, A CONTROL CIRCUIT FOR EACH FIELD EFFECT TRANSISTOR FOR APPLYING A SIGNAL EFFECTIVE TO SELECTIVELY BLOCK OR PASS CURRENT
Claim 2
Dependent Claim
93 words
IN AN OPERATION AMPLIFIER CIRCUIT, AN ELECTRONIC SWITCH COMPRISING AT LEAST TWO INPUT CIRCUITS LEADING IN PARALLEL TO THE INPUT TERMINAL OF A HIGH GAIN D.C. AMPLIFIER, A FEEDBACK CIRCUIT FOR EACH INPUT CIRCUIT AND CONNECTED TO THE LATTER AT A JUNCTION, A GROUNDING CIRCUIT FOR EACH INPUT CIRCUIT, A FIELD EFFECT TRANSISTOR IN EACH INPUT CIRCUIT BETWEEN SAID JUNCTION AND SAID INPUT TERMINAL OF THE AMPLIFIER, A GROUNDING TRANSISTOR IN EACH GROUNDING CIRCUIT, A CONTROL CIRCUIT FOR EACH FIELD EFFECT TRANSISTOR FOR APPLYING A SIGNAL EFFECTIVE TO SELECTIVELY BLOCK OR PASS CURRENT
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) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |