Patent US3489889A successfully refreshed from Google Patents.
US3489889A
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Redundant signalling apparatus having improved failure exclusion
Assignee: Boeing North American Inc
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Filing: 1966-09-28
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Granted: 1970-01-13
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Expires: 1986-09-28
Abstract
No abstract record available.
Inventors
- 👤 Alfonso S Escobosa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:27
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/52; H03F1/526; G; G06; G06G; G06G5/00; G06G7/00; G06G7/12; G06G7/25
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3065911A
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US3014185A
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US3095784A
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US3070071A
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US3095783A
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US3283229A
Cited
US3221609A
Cited
US3338138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |