Patent DE3504292C1 successfully refreshed from Google Patents.
US2874977A
Expired / Lapsed
US
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Assignee: Zenith Electronics LLC
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Filing: 1957-02-14
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Granted: 1959-02-24
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Expires: 1977-02-14
Abstract
No abstract record available.
Inventors
- 👤 George V Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:15
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/161; Y; Y10; Y10S; Y10S283/00; Y10S283/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24835; Y10T428/24851; Y10T428/24868
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2083206A
Cited
US2550468A
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US2659825A
Cited
US2648924A
Cited
US2689306A
Cited
US2689307A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |