US3732356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color amplifier
Assignee: Thomas International Corp
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Filing: 1971-06-02
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Granted: 1973-05-08
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Expires: 1991-06-02
Abstract
Abstract A transistorized color amplifier for the color circuit of a color television receiver with a current biased diode limiter circuit for preventing saturation of the amplifier.
Inventors
- 👤 L Matzek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:31
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/64; H04N9/648; H03; H03F; H03F1/00; H03F1/32; H04N9/68
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
In a color display system with a color signal input and a transistor color amplifier subject to current saturation with signal peaks, excess current carriers in the transistor causing a color smear following saturation, the improvement comprising: a source of color signal; an input circuit for said color amplifier, connected with said source of color signal; and a signal limiter in said input circuit to eliminate transistor saturation and the smear caused thereby.
Claim 2
Dependent Claim
73 words
In a color display system with a color signal input and a transistor color amplifier subject to current saturation with signal peaks, excess current carriers in the transistor causing a color smear following saturation, the improvement comprising: a source of color signal; an input circuit for said color amplifier, connected with said source of color signal; and a signal limiter in said input circuit to eliminate transistor saturation and the smear caused thereby.
Claim 3
Dependent Claim
15 words
The color amplifier of claim 1 in which said signal limiter is a biased diode.
Claim 4
Dependent Claim
30 words
The color amplifier of claim 1 in which said signal limiter is a current biased diode connected in series between said color signal source and said color amplifier input circuit.
Claim 5
Dependent Claim
57 words
The color amplifier of claim 1 in which said transistor color amplifier has a base input element and said signal limiter is a diode connected in series between said signal source and said base element, and including a source of bias potential for said diode and a resistor connecting the diode with the source of bias potential.
Claim 6
Dependent Claim
34 words
The color amplifier of claim 2 in which said source of chroma signal includes a low output impedance driver transistor and said diode has a bias derived from the circuit of said driver transistor.
Claim 7
Dependent Claim
33 words
The color amplifier of claim 5 in which said chroma signal is derived from one element of said driver transistor and a current bias for said diode is derived from another element thereof.
Claim 8
Dependent Claim
45 words
The color amplifier of claim 6 in which said driver transistor includes collector and emitter electrodes each connected with a source of operating potential through a resistor, and the chroma signal is derived from one of said elements and the bias signal from the other.
Claim 9
Dependent Claim
15 words
The color amplifier of claim 2, including a capacitor connected in parallel with said diode.
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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |