US2626993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of carrier transmission systems by pilot frequencies
Assignee: International Standard Electric Corp
•
Filing: 1947-06-07
•
Granted: 1953-01-27
•
Expires: 1967-06-07
Abstract
No abstract record available.
Inventors
- 👤 Wright Frank Coram
- 👤 Hodgson Kenneth George
- 👤 Roche Alleman Holly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 01:58
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1811102A
Cited
US1784176A
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US2083666A
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US1972286A
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GB436635A
Cited
US2037107A
Cited
US2102138A
Cited
US2105809A
Cited
US2326871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-01-27 | 1956-07-28 | 1957-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-27 | 1960-07-28 | 1961-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-27 | 1964-07-28 | 1965-01-27 | $7700.00 | Window Closed / Lapsed |