US3138002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety device, especially for aircraft servo-controls
Assignee: Safran Aircraft Engines SAS
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Filing: 1962-04-04
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Granted: 1964-06-23
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Expires: 1982-04-04
Abstract
No abstract record available.
Inventors
- 👤 Ernst Adolphe Otton Gontier
- 👤 Jardinier Jean Paul Joseph
- 👤 Rona Janos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:25
CPC Classifications
F; F15; F15B; F15B18/00; G; G05; G05D; G05D1/00; G05D1/0055; G05D1/0077
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A SERVO-CONTROL APPARATUS WHICH IS STILL CAPABLE OF OPERATION AFTER TWO POSSIBLE FAILURES, COMPRISING IN COMBINATION THREE COMPLETE SERVO-CONTROL UNITS HAVING TERMINAL OR POWER STAGES WHICH ARE CONNECTED BY A MECHANICAL COUPLING DEVICE TO A MEMBER TO BE CONTROLLED, MEANS FOR COMPARING THE RESPECTIVE OPERATION OF THE SAID SERVO-CONTROL UNITS, AND SWITCHING MEANS NORMALLY ENSURING THE SIMULTANEOUS SUPPLY OF SAID THREE UNITS AND PERMITTING THE ISOLATION, BY A SINGLE OPERATION, OF THE POWER STAGE OF A FAILING UNIT AND PUTTING IN A STAND-BY STATE ONE OF THE TWO UNITS WHICH HAVE REMAINED OPERATIVE, A SINGLE FURTHER OPERATION ENABLING THE FUNCTIONS OF SAID LAST TWO UNITS TO BE REVERSED IN THE EVENT OF A SECOND FAILURE.
Claim 2
Dependent Claim
115 words
A SERVO-CONTROL APPARATUS WHICH IS STILL CAPABLE OF OPERATION AFTER TWO POSSIBLE FAILURES, COMPRISING IN COMBINATION THREE COMPLETE SERVO-CONTROL UNITS HAVING TERMINAL OR POWER STAGES WHICH ARE CONNECTED BY A MECHANICAL COUPLING DEVICE TO A MEMBER TO BE CONTROLLED, MEANS FOR COMPARING THE RESPECTIVE OPERATION OF THE SAID SERVO-CONTROL UNITS, AND SWITCHING MEANS NORMALLY ENSURING THE SIMULTANEOUS SUPPLY OF SAID THREE UNITS AND PERMITTING THE ISOLATION, BY A SINGLE OPERATION, OF THE POWER STAGE OF A FAILING UNIT AND PUTTING IN A STAND-BY STATE ONE OF THE TWO UNITS WHICH HAVE REMAINED OPERATIVE, A SINGLE FURTHER OPERATION ENABLING THE FUNCTIONS OF SAID LAST TWO UNITS TO BE REVERSED IN THE EVENT OF A SECOND FAILURE.
References Cited (Backward Citations)
US2686285A
Cited
US3095783A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |