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Linear motion wind driven power plant
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Patent number 5,992,341
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Issue date Nov 30, 1999
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Northrop Grumman Corporation
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Heinz A. Gerhardt
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
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Linear motion wind driven power plant
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Patent number 5,758,911
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Issue date Jun 2, 1998
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Northrop Grumman Corporation
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Heinz A. Gerhardt
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F03 - MACHINES OR ENGINES FOR LIQUIDS WIND, SPRING WEIGHT AND MISCELLANEOUS M...
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Skewed hinge control surface
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Patent number 5,398,888
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Issue date Mar 21, 1995
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Northrop Grumman Corporation
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Heinz A. Gerhardt
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F42 - AMMUNITION BLASTING
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Paddle wheel rotorcraft
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Patent number 5,265,827
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Issue date Nov 30, 1993
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Northrop Corporation
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Heinz A. Gerhardt
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B64 - AIRCRAFT AVIATION COSMONAUTICS
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Aircraft outboard control
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Patent number 5,156,358
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Issue date Oct 20, 1992
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Northrop Corporation
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Heinz A. Gerhardt
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B64 - AIRCRAFT AVIATION COSMONAUTICS
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Variable span wing
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Patent number 4,181,277
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Issue date Jan 1, 1980
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Northrop Corporation
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Heinz A. Gerhardt
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B64 - AIRCRAFT AVIATION COSMONAUTICS