US2757239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carrier frequency control system
Assignee: LENKURT ELECTRIC CO Inc
•
Filing: 1951-07-20
•
Granted: 1956-07-31
•
Expires: 1971-07-20
Abstract
No abstract record available.
Inventors
- 👤 Philips B Patton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:35
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2149727A
Cited
US2171048A
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US2231538A
Cited
US2314707A
Cited
US2300415A
Cited
US2421727A
Cited
US2539426A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-31 | 1960-01-30 | 1960-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-31 | 1964-01-30 | 1964-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-31 | 1968-01-30 | 1968-07-31 | $7700.00 | Window Closed / Lapsed |