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US3501668A
Expired / Lapsed
US
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Low focus voltage electron gun for cathode-ray tubes
Assignee: Zenith Electronics LLC
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Filing: 1968-05-10
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Granted: 1970-03-17
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Expires: 1988-05-10
Abstract
No abstract record available.
Inventors
- 👤 Nicholas P Pappadis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:48
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/46; H01J29/58; H01J29/62; H01J29/622; H01J29/624; H01J29/48; H01J29/50; H01J29/506
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2971118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |