US3168708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential amplifier circuit for magnetic memory sensing
Assignee: Ampex Corp
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Filing: 1961-04-28
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Granted: 1965-02-02
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Expires: 1981-04-28
Abstract
No abstract record available.
Inventors
- 👤 Stuart-Williams Raymond
- 👤 Ben T Goda
- 👤 Gordon B Barrus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:35
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F3/00; H03F3/26; H03K; H03K5/00; H03K5/01; H03K5/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
106 words
IN A DIFFERENTIAL AMPLIFIER OF THE TYPE HAVING A PLURALITY OF AMPLIFICATION STAGES, AN INPUT AND AN OUTPUT, THE IMPROVEMENT COMPRISING AT LEAST ONE LOW-PASS FEEDBACK PATH BETWEEN SAID INPUT AND OUTPUT, SAID FEEDBACK PATH INCLUDING AN EMITTER-FOLLOWER STAGE COMPRISING A TRANSISTOR HAVING EMITTER, BASE, AND COLLECTOR ELECTRODES A SOURCE OF OPERATING POTENTIAL HAVING TWO OPPOSITE POTENTIAL OUTPUT TERMINALS AND A GROUND POTENTIAL TERMINAL, MEANS RESPECTIVELY CONNECTING SAID TRANSISTOR COLLECTOR AND EMITTER TO SAID OPPOSITE POTENTIAL OUTPUT TERMINALS OF SAID SOURCE OF OPERATING POTENTIAL, A FIRST AND SECOND DIODE HAVING THEIR ANODES CONNECTED TOGETHER TO FORM A JUNCTION, MEANS CONNECTING THE CATHODE OF SAID FIRST DIODE
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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) | 1968-02-02 | 1968-08-03 | 1969-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-02 | 1972-08-03 | 1973-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-02 | 1976-08-03 | 1977-02-02 | $7700.00 | Window Closed / Lapsed |