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US3392391A
Expired / Lapsed
US
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Direction-finding system
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1966-12-19
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Granted: 1968-07-09
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Expires: 1986-12-19
Abstract
No abstract record available.
Inventors
- 👤 Douglas E Royal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:08
CPC Classifications
G; G01; G01S; G01S3/00; G01S3/02; G01S3/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2951152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-09 | 1972-01-08 | 1972-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-09 | 1976-01-08 | 1976-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-09 | 1980-01-08 | 1980-07-09 | $7700.00 | Window Closed / Lapsed |