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Reciprocating rotary engine
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Patent number 4,334,506
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Issue date Jun 15, 1982
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Albert F. Albert
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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Opposed piston engine
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Patent number 4,030,471
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Issue date Jun 21, 1977
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Frank Ginkel
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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3913455
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Patent number 3,913,455
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Issue date Oct 21, 1975
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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3142229
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Patent number 3,142,229
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Issue date Jul 28, 1964
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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3131604
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Patent number 3,131,604
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Issue date May 5, 1964
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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2811143
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Patent number 2,811,143
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Issue date Oct 29, 1957
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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2209655
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Patent number 2,209,655
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Issue date Jul 30, 1940
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES