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Displacement machine
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Patent number 5,004,409
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Issue date Apr 2, 1991
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Raoul S. Nakhmanson
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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Bi-annulus rotary engine
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Patent number 4,433,658
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Issue date Feb 28, 1984
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John S. Stojanowski
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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2461073
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Patent number 2,461,073
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Issue date Feb 8, 1949
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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2127968
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Patent number 2,127,968
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Issue date Aug 23, 1938
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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1518812
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Patent number 1,518,812
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Issue date Dec 9, 1924
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES