US3955115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color television with VRT and automatic degaussing
Assignee: Zenith Electronics LLC
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Filing: 1975-01-03
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Granted: 1976-05-04
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Expires: 1995-01-03
Abstract
Abstract A color television receiver includes a voltage regulating transformer having an additional secondary winding coupled to the primary side of the transformer through a thermistor. A degaussing coil is supplied through another thermistor from the main secondary winding. Upon turn-on of the receiver, the additional secondary winding enables substantially higher current flow through the degaussing coil to assist in demagnetization of the permeable material in the picture tube.
Inventors
- 👤 Hans E. Manske
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:00
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/29
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
96 words
A color television receiver comprising: signal processing and deflection circuitry; a picture tube including permeable material subject to being magnetized by extraneous magnetic fields; a voltage regulating transformer having a saturable core and a primary and secondary winding for supplying current at a regulated voltage to said circuitry; degaussing means including a degaussing coil positioned adjacent to said picture tube for periodically developing an alternating magnetic field of diminishing strength for demagnetization of said permeable material; and means temporarily altering the operation of said voltage regulating transformer for enabling greater current flow through said degaussing coil.
Claim 2
Dependent Claim
96 words
A color television receiver comprising: signal processing and deflection circuitry; a picture tube including permeable material subject to being magnetized by extraneous magnetic fields; a voltage regulating transformer having a saturable core and a primary and secondary winding for supplying current at a regulated voltage to said circuitry; degaussing means including a degaussing coil positioned adjacent to said picture tube for periodically developing an alternating magnetic field of diminishing strength for demagnetization of said permeable material; and means temporarily altering the operation of said voltage regulating transformer for enabling greater current flow through said degaussing coil.
Claim 3
Dependent Claim
29 words
A color television receiver as in claim 1, wherein said degaussing means are operable each time said receiver is energized from a "cold" start and include a temperatureresponsive impedance.
Claim 4
Dependent Claim
23 words
A color television receiver as in claim 2, wherein said last-mentioned means include an additional secondary winding electrically coupled to said primary winding.
Claim 5
Dependent Claim
34 words
A color television receiver as in claim 3, wherein a second temperature-responsive impedance is connected in series with said additional secondary winding for automatically disabling said additional secondary winding after a predetermined time interval.
Claim 6
Dependent Claim
24 words
A color television receiver as in claim 4, wherein said additional secondary winding is connected to said primary winding through said second temperature-responsive impedance.
Claim 7
Dependent Claim
24 words
A color television receiver as in claim 4, wherein said voltage regulating transformer includes an additional primary winding coupled to said additional secondary winding.
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) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |