Patent US3660679A successfully refreshed from Google Patents.
US3660679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor circuit
Assignee: Sony Corp
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Filing: 1970-04-24
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Granted: 1972-05-02
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Expires: 1990-04-24
Abstract
Abstract A transistor circuit having a pair of transistors connected in the manner of a differential amplifier connection and a pair of diodes respectively connected with the transistors, which diodes constituting a series connection between the pair of transistors. A control element is connected between the pair of diodes in order to give switching operation to the diodes.
Inventors
- 👤 Yoshio Ishigaki
- 👤 Hajime Shinoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:26
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03D; H03D1/00; H03D1/22; H03F; H03F3/00; H03F3/34; H03F3/343; H03F3/347; H03F3/45; H03F3/45071; H03F3/45076; H03F3/4508; H03F3/45098; H03F3/72
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
A transistor circuit comprising: a pair of transistors each having first, second and third electrodes, at least one of said first electrodes being supplied with an input signal, means for deriving an output signal from at least one of said second electrodes, a constant current source, means for coupling said constant current source to said third electrodes, a semiconductor device control switching means, a pair of current paths in parallel with the constant current source with each of said current paths including a coupling from respective ones of said third electrodes to said semiconductor device control switching means, and at least one diode in each of said pair of current paths.
Claim 2
Dependent Claim
111 words
A transistor circuit comprising: a pair of transistors each having first, second and third electrodes, at least one of said first electrodes being supplied with an input signal, means for deriving an output signal from at least one of said second electrodes, a constant current source, means for coupling said constant current source to said third electrodes, a semiconductor device control switching means, a pair of current paths in parallel with the constant current source with each of said current paths including a coupling from respective ones of said third electrodes to said semiconductor device control switching means, and at least one diode in each of said pair of current paths.
Claim 3
Dependent Claim
24 words
A transistor circuit as claimed in claim 1 wherein said first, second and third electrodes are respectively a base, a collector and an emitter.
Claim 4
Dependent Claim
27 words
A transistor circuit as claimed in claim 1 wherein said output signal deriving means is an impedance element connected between said second electrode and a voltage source.
Claim 5
Dependent Claim
23 words
A transistor circuit as claimed in claim 1 wherein said pair of diodes are connected in series to each other with opposite polarities.
Claim 6
Dependent Claim
20 words
A transistor circuit as claimed in claim 1 wherein said control means includes a transistor supplied with the control signal.
Claim 7
Dependent Claim
29 words
A transistor circuit as claimed in claim 1 wherein a second pair of transistors forming a differential amplifier are connected between output terminals of the first-mentioned pair of transistors.
Claim 8
Dependent Claim
23 words
A transistor circuit as claimed in claim 1 wherein said control means comprises a pair of transistors connected between said pair of diodes.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |