US3403398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double bounce second signal return filter corrected fmcw radio altimeter
Assignee: Collins Radio Co
•
Filing: 1967-06-01
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Granted: 1968-09-24
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Expires: 1987-06-01
Abstract
No abstract record available.
Inventors
- 👤 Kenneth J Engholm
- 👤 John B Majerus
- 👤 Alan D Snodgrass
- 👤 Charles A Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:19
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/06; G01S13/08; G01S13/32; G01S13/34; G01S13/345
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3341849A
Cited
US3344423A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |