US3588328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for maintaining color balance despite variations of the supply voltage
Assignee: US Philips Corp
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Filing: 1969-09-22
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Granted: 1971-06-28
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Expires: 1989-09-22
Abstract
Abstract IN A THREE-GUN COLOR DISPLAY TUBE AT LEAST ONE OF THE CATHODES IS CONNECTED TO THE LUMINANCE AMPLIFIER THROUGH A NONLINEAR NEGATIVE FEEDBACK RESISTIVE CIRCUIT, WHICH IS AT LEAST PARTIALLY SHUNTED BY A UNILATERALLY CONDUCTING ELEMENT.
Inventors
- 👤 Leonardus Adrianus J Verhoeven
- 👤 Hendrikus Dollekamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:35
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/16; H04N9/18
Claims Analysis
Total Claims: 0
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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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |