US3404307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switch-operated color television demagnetization system
Assignee: Packard Bell Electronics Corp
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Filing: 1965-03-03
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Granted: 1968-10-01
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Expires: 1985-03-03
Abstract
No abstract record available.
Inventors
- 👤 Fred M Hayden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:26
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/29
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
179 words
A DEMAGNETIZATION SYSTEM FOR A TELEVISION RECEIVING SET HAVING A PICTURE TUBE WITH A DISPLAY FACE AN A SHEILD MOUNTED AROUND THE PICTURE TUBE COMPRISING: A FIRST COIL MOUNTED ON THE SHIELD ABOVE THE DISPLAY FACE OF THE PICTURE TUBE; A SECOND COIL MOUNTED ON THE SHIELD BELOW THE DISPLAY FACE OF THE PICTURE TUBE; THE FIRST AND SECOND COILS BEING ARRANGED RELATIVE TO EACH OTHER IN SUCH A MANNER THAT THEIR MAGNETIC POLES ARE OPPOSED; A SOURCE OF AC POWER COUPLED TO A FIRST END OF THE FIRST COIL AND A FIRST END OF THE SECOND COIL; A RECTIFIER MEANS COUPLED TO A SECOND END OF THE FIRST COIL AND A SECOND END OF THE SECOND COIL; A STORAGE CAPACITOR HAVING A FIRST PLATE COUPLED TO A FIRST OUTPUT TERMINAL OF THE RECTIFIER MEANS; A RESISTOR HAVING A FIRST END COUPLED TO THE FIRST PLATE OF THE CAPACITOR; AND MEANS FOR SWITCHING A SECOND PLATE OF THE CAPACITOR BETWEEN CONNECTION WITH A SECOND OUTPUT TERMINAL OF THE RECTIFIER MEANS AND CONNECTION WITH A SECOND END OF THE RESISTOR.
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) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |