US3601700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for testing a three wire differential synchro chain
Assignee: Boeing Co
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Filing: 1969-09-11
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Granted: 1971-08-24
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Expires: 1989-09-11
Abstract
Abstract An aircraft stall warning system wherein flap and air vane controlled synchros phase shift an alternating current reference signal in response to lift air foil attitude to form a control signal that controls, by the phase shift, the amount of the reference signal gated to a level-sensitive power switch for activating preferably a pilot''s column shaker warning upon the aircraft''s assuming a critical angle of attack. Two alternative modes of ''''fail safe'''' testing work in integral relationship with ''''built-in'''' bias inherent in the system.
Inventors
- 👤 John E Collett
- 👤 Rudolph P Host
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:34
CPC Classifications
B; B64; B64D; B64D43/00; B64D43/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
59 words
A method for testing a three wire differential type synchro chain comprising the steps of 1. switching a capacitor into one leg of the input power to said three wire differential synchro chain, and 2. connecting said synchro chain to a two phase induction motor for spinning a dial attached to its shaft to indicate proper synchro chain functioning.
Claim 2
Independent Claim
59 words
A method for testing a three wire differential type synchro chain comprising the steps of 1. switching a capacitor into one leg of the input power to said three wire differential synchro chain, and 2. connecting said synchro chain to a two phase induction motor for spinning a dial attached to its shaft to indicate proper synchro chain functioning.
Claim 3
Dependent Claim
24 words
connecting said synchro chain to a two phase induction motor for spinning a dial attached to its shaft to indicate proper synchro chain functioning.
Claim 4
Dependent Claim
24 words
connecting said synchro chain to a two phase induction motor for spinning a dial attached to its shaft to indicate proper synchro chain functioning.
References Cited (Backward Citations)
US2625599A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |