Patent US3820517A successfully refreshed from Google Patents.
US2567539A
Expired / Lapsed
US
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Subscriber television system
Assignee: Zenith Electronics LLC
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Filing: 1948-06-25
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Granted: 1951-09-11
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Expires: 1968-06-25
Abstract
No abstract record available.
Inventors
- 👤 Nathan W Aram
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:55
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/167; H04N7/171; H04N7/1713
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1790486A
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US1932253A
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US1919804A
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US1769920A
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GB421937A
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US2114500A
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US2403059A
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US2310197A
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US2312145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-10 | 1955-03-12 | 1955-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-10 | 1959-03-12 | 1959-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-10 | 1963-03-12 | 1963-09-11 | $7700.00 | Window Closed / Lapsed |