Patent US2709254A successfully refreshed from Google Patents.
US2709254A
Expired / Lapsed
US
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Subscription radio broadcasting system and equipment therefor
Assignee: MULTIPLEX DEV CORP
•
Filing: 1950-08-14
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Granted: 1955-05-24
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Expires: 1970-08-14
Abstract
No abstract record available.
Inventors
- 👤 William S Halstead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:37
CPC Classifications
H; H04; H04K; H04K1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1733609A
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US2146301A
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US2233183A
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US2245347A
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US2282971A
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US2340798A
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US2410276A
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US2321651A
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US2392672A
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US2476337A
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US2421727A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-23 | 1958-11-22 | 1959-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-23 | 1962-11-22 | 1963-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-23 | 1966-11-22 | 1967-05-24 | $7700.00 | Window Closed / Lapsed |