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Composite helicopter swashplate
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Patent number 4,804,315
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Issue date Feb 14, 1989
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United Technologies Corporation
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Donald L. Ferris
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B64 - AIRCRAFT AVIATION COSMONAUTICS
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Composite helicopter rotor hub
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Patent number 4,797,064
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Issue date Jan 10, 1989
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United Technologies Corporation
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Donald L. Ferris
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B64 - AIRCRAFT AVIATION COSMONAUTICS
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Helicopter gimbal rotor
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Patent number 4,569,629
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Issue date Feb 11, 1986
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United Technologies Corporation
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Donald L. Ferris
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B64 - AIRCRAFT AVIATION COSMONAUTICS
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Droop stop for fully articulated rotor
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Patent number 4,368,006
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Issue date Jan 11, 1983
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The United States of America as represented by the Secretary of the Navy
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Donald L. Ferris
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B64 - AIRCRAFT AVIATION COSMONAUTICS
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Cross beam rotor
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Patent number 4,299,538
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Issue date Nov 10, 1981
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United Technologies Corporation
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Donald L. Ferris
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B64 - AIRCRAFT AVIATION COSMONAUTICS
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Blade fold restraint system
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Patent number 4,284,387
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Issue date Aug 18, 1981
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United Technologies Corp.
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Donald L. Ferris
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B64 - AIRCRAFT AVIATION COSMONAUTICS
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Control rod roll-over limiter
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Patent number 4,174,137
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Issue date Nov 13, 1979
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The United States of America as represented by the Secretary of the Army
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Donald L. Ferris
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B64 - AIRCRAFT AVIATION COSMONAUTICS
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Helicopter rotor lead-lag damper
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Patent number 4,105,365
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Issue date Aug 8, 1978
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United Technologies Corporation
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Donald L. Ferris
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B64 - AIRCRAFT AVIATION COSMONAUTICS
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Cross beam rotor
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Patent number 4,087,203
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Issue date May 2, 1978
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United Technologies Corporation
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Donald Leroy Ferris
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B64 - AIRCRAFT AVIATION COSMONAUTICS
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Two-position helicopter main rotor
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Patent number 3,972,491
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Issue date Aug 3, 1976
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United Technologies Corporation
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Donald Leroy Ferris
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B64 - AIRCRAFT AVIATION COSMONAUTICS