US2492138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical modulator for radio beacons utilizing two tones
Assignee: International Standard Electric Corp
•
Filing: 1944-12-12
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Granted: 1949-12-27
•
Expires: 1964-12-12
Abstract
No abstract record available.
Inventors
- 👤 Earp Charles William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:15
CPC Classifications
H; H03; H03C; H03C7/00; H03C7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2075125A
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US2117895A
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FR802756A
Cited
US2122097A
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US2198025A
Cited
US2232591A
Cited
US2232592A
Cited
US2244756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |