US2808508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Receiver for a. m. speech channel having means to eliminate effects of superimposed frequency shift keying
Assignee: Hupp Corp
•
Filing: 1953-12-31
•
Granted: 1957-10-01
•
Expires: 1973-12-31
Abstract
No abstract record available.
Inventors
- 👤 Dwight V Sinninger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:25
CPC Classifications
H; H04; H04J; H04J9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2611825A
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US2575047A
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US2516009A
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US2623169A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |