Patent US2847500A successfully refreshed from Google Patents.
US2847500A
Expired / Lapsed
US
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Subscription television system
Assignee: Zenith Electronics LLC
•
Filing: 1951-08-09
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Granted: 1958-08-12
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Expires: 1971-08-09
Abstract
No abstract record available.
Inventors
- 👤 Walter S Druz
- 👤 Erwin M Roschke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:27
CPC Classifications
H; H04; H04N; H04N7/00; H04N7/16; H04N7/167
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1769918A
Cited
US2408692A
Cited
US2414101A
Cited
US2636936A
Cited
US2664460A
Cited
US2686831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-11 | 1962-02-10 | 1962-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-11 | 1966-02-10 | 1966-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-11 | 1970-02-10 | 1970-08-12 | $7700.00 | Window Closed / Lapsed |