US2637028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiated-signal direction finder
Assignee: Hazeltine Research Inc
•
Filing: 1948-01-30
•
Granted: 1953-04-28
•
Expires: 1968-01-30
Abstract
No abstract record available.
Inventors
- 👤 Mcilwain Knox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 02:58
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/42
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2508384A
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US2431990A
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US2467361A
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US2450946A
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US2418143A
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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) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |