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US3712998A
Expired / Lapsed
US
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Cathode ray tube for producing variable sized displays
Assignee: Tektronix Inc
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Filing: 1970-10-21
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Granted: 1973-01-23
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Expires: 1990-10-21
Abstract
Abstract A CATHODE RAY TUBE IS PROVIDED WITH FIRST AND SECOND APERTURED ELECTRODES BETWEEN THE TUBE''S DEFLECTION APPARATUS AND THE PHOSPHOR SCREEN. THE ELECTRODE CLOSEST TO THE TUBE''S DEFLECTION SYSTEM IS SWITCHED BETWEEN THE VOLTAGE OF THE SECOND ELECTRODE AND A LOWER VOLTAGE FOR "GEAR SHIFTING" BETWEEN DIFFERENT SIZED DISPLAYS.
Inventors
- 👤 M Mauck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:40
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/80; H01J29/803; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/121
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |