Patent US2578523A successfully refreshed from Google Patents.
US2883524A
Expired / Lapsed
US
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Frequency shift transmission system
Assignee: Individual
•
Filing: 1953-06-15
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Granted: 1959-04-21
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Expires: 1973-06-15
Abstract
No abstract record available.
Inventors
- 👤 Louis F Deise
- 👤 Ray E Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:57
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1642173A
Cited
US1684261A
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US1882698A
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US2211010A
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US2379897A
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US2480820A
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US2376667A
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US2712061A
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US2653223A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |