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US2743438A
Expired / Lapsed
US
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Echo-ranging system
Assignee: Individual
•
Filing: 1945-12-11
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Granted: 1956-04-24
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Expires: 1965-12-11
Abstract
No abstract record available.
Inventors
- 👤 Irving H Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:52
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/58; G01S13/581
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2134716A
Cited
US2415095A
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US2406316A
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US2403625A
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US2414798A
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US2450945A
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US2408742A
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US2479568A
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US2455639A
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US2406358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-24 | 1959-10-24 | 1960-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-24 | 1963-10-24 | 1964-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-24 | 1967-10-24 | 1968-04-24 | $7700.00 | Window Closed / Lapsed |