Patent US3308383A successfully refreshed from Google Patents.
US3308383A
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US
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Amplifying means for use with transmission systems with feedback means providing error signal for amplifier
Assignee: Hitachi Ltd
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Filing: 1964-09-16
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Granted: 1967-03-07
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Expires: 1984-09-16
Abstract
No abstract record available.
Inventors
- 👤 Kinoshita Toshio
- 👤 Takahashi Toshio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:21
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/303; H03F3/00; H03F3/38; H03F3/387
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
AMPLIFYING MEANS FOR USE WITH A TRANSMISSION SYSTEM COMPRISING A DETECTING BRIDGE ARRANGED FOR EXCITATION BY A SQUARE WAVE TO GENERATE AN UNBALANCE SQUARE WAVE VOLTAGE OUTPUT, MEANS INCLUDING AT LEAST AN A.C. AMPLIFIER AND A SYNCHRONOUS RECTIFIER FOR CONVERTING SAID UNBALANCE SQUARE WAVE VOLTAGE INTO A D.C. OUTPUT THEREFROM, MEANS FOR OBTAINING A VOLTAGE PROPORTIONAL TO SAID D.C. OUTPUT, A CHOPPER FOR CONVERTING SAID VOLTAGE INTO A SQUARE WAVE VOLTAGE, AND MEANS FOR EFFECTING NEGATIVE FEEDBACK OF SAID SQUARE WAVE VOLTAGE TO THE INPUT SIDE OF SAID A.C. AMPLIFIER, THE BALANCE BETWEEN SAID NEGAGIVE FEEDBACK SQUARE WAVE VOLTAGE AND SAID UNBALANCE SQUARE WAVE VOLTAGE OF SAID DETECTING BRIDGE BEING AN ERROR SIGNAL FOR SAID A.C. AMPLIFIER.
Claim 2
Dependent Claim
117 words
AMPLIFYING MEANS FOR USE WITH A TRANSMISSION SYSTEM COMPRISING A DETECTING BRIDGE ARRANGED FOR EXCITATION BY A SQUARE WAVE TO GENERATE AN UNBALANCE SQUARE WAVE VOLTAGE OUTPUT, MEANS INCLUDING AT LEAST AN A.C. AMPLIFIER AND A SYNCHRONOUS RECTIFIER FOR CONVERTING SAID UNBALANCE SQUARE WAVE VOLTAGE INTO A D.C. OUTPUT THEREFROM, MEANS FOR OBTAINING A VOLTAGE PROPORTIONAL TO SAID D.C. OUTPUT, A CHOPPER FOR CONVERTING SAID VOLTAGE INTO A SQUARE WAVE VOLTAGE, AND MEANS FOR EFFECTING NEGATIVE FEEDBACK OF SAID SQUARE WAVE VOLTAGE TO THE INPUT SIDE OF SAID A.C. AMPLIFIER, THE BALANCE BETWEEN SAID NEGAGIVE FEEDBACK SQUARE WAVE VOLTAGE AND SAID UNBALANCE SQUARE WAVE VOLTAGE OF SAID DETECTING BRIDGE BEING AN ERROR SIGNAL FOR SAID A.C. AMPLIFIER.
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) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |