US3721931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic focusing and deflection assembly for cathode ray tubes
Assignee: RCA Licensing Corp
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Filing: 1971-07-06
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Granted: 1973-03-20
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Expires: 1991-07-06
Abstract
Abstract A DEFLECTION COIL ASSEMBLY FOR AN IMAGE CONVERSION TUBE SUCH AS A VIDICON HAS THE ACTIVE FIELD PRODUCING CONDUCTORS FLARED AWAY FROM THE CENTRAL LONGITUDINAL AXIS OF THE VIDICON AT THE END ADAPTED TO BE CLOSEST TO THE TARGET ELECTRODE. A FOCUSING COIL ASSEMBLY WHICH MAY BE DISPOSED COAXIALLY INSIDE OF THE DEFLECTION COIL ASSEMBLY PROVIDES A NONUNIFORM MAGNETIC FIELD WHICH IN CONJUNCTION WITH THE DEFLECTION FIELD ENABLES OPERATION OF THE TUBE WITH MINIMUM ABERRATIONS SUCH AS ASTIGMATISM AND MINIMUM BEAM LANDING ERROR.
Inventors
- 👤 J Wharton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:23
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/465
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |