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US2457137A
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Ultra high frequency system
Assignee: International Standard Electric Corp
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Filing: 1943-03-24
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Granted: 1948-12-28
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Expires: 1963-03-24
Abstract
No abstract record available.
Inventors
- 👤 Earp Charles William
- 👤 Strong Charles Eric
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:24
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/68; H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1642663A
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US1761118A
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US1814813A
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US2186980A
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US2253975A
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US2211352A
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US2239560A
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US2260844A
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US2303493A
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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) | 1951-12-28 | 1952-06-28 | 1952-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-28 | 1956-06-28 | 1956-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-28 | 1960-06-28 | 1960-12-28 | $7700.00 | Window Closed / Lapsed |