Patent US3521229A successfully refreshed from Google Patents.
US3521229A
Expired / Lapsed
US
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Safety device for use in aircraft during automatic landing
Assignee: SUD AVIAT SOC NATIONALE DE CON
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Filing: 1967-02-16
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Granted: 1970-07-21
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Expires: 1987-02-16
Abstract
No abstract record available.
Inventors
- 👤 Jacques Charles Henri J Lepers
- 👤 Jean Christian Delprat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:46
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G05; G05D; G05D1/00; G05D1/04; G05D1/06; G05D1/0607; G05D1/0653; G05D1/0676
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3439321A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |