Patent US2974305A successfully refreshed from Google Patents.
US2974305A
Expired / Lapsed
US
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Subscription television computer
Assignee: Zenith Electronics LLC
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Filing: 1955-11-14
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Granted: 1961-03-07
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Expires: 1975-11-14
Abstract
No abstract record available.
Inventors
- 👤 George V Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:03
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/167
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2689082A
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US2052708A
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US2348680A
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US2377205A
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US2577141A
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US2573349A
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US2812509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |