US3408585A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Operational amplifier with improved drive means
Assignee: International Business Machines Corp
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Filing: 1966-12-09
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Granted: 1968-10-29
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Expires: 1986-12-09
Abstract
No abstract record available.
Inventors
- 👤 Jr James C Greeson
- 👤 James J Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:14
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/56; H03F1/08; H03F1/083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
IN COMBINATION WITH AN OPERATIONAL AMPLIFIER HAVING INPUT AND NEGATIVE FEEDBACK IMPEDANCES, CIRCUIT MEANS FOR COUPLING THE OUTPUT OF THE AMPLIFIER TO VARIOUS REACTIVE LOAD IMPEDANCES WITHOUT DISTURBING AMPLIFIER STABILITY, SAID CIRCUIT MEANS BEING CHARACTERIZED BY: A FIRST SIGNAL PATH INCLUDING A SERIES-CONNECTED CAPACITOR AND AN ACTIVE BUFFER DEVICE COUPLING HIGH FREQUENCY SIGNALS FROM THE AMPLIFIER OUTPUT TO THE LOAD AND BLOCKING LOW FREQUENCY SIGNALS; AND
Claim 2
Dependent Claim
66 words
IN COMBINATION WITH AN OPERATIONAL AMPLIFIER HAVING INPUT AND NEGATIVE FEEDBACK IMPEDANCES, CIRCUIT MEANS FOR COUPLING THE OUTPUT OF THE AMPLIFIER TO VARIOUS REACTIVE LOAD IMPEDANCES WITHOUT DISTURBING AMPLIFIER STABILITY, SAID CIRCUIT MEANS BEING CHARACTERIZED BY: A FIRST SIGNAL PATH INCLUDING A SERIES-CONNECTED CAPACITOR AND AN ACTIVE BUFFER DEVICE COUPLING HIGH FREQUENCY SIGNALS FROM THE AMPLIFIER OUTPUT TO THE LOAD AND BLOCKING LOW FREQUENCY SIGNALS; AND
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) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |