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Rotary disc engine
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Patent number 6,257,196
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Issue date Jul 10, 2001
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Alfredo Alvarado
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F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
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Prosthetic device
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Patent number 4,904,268
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Issue date Feb 27, 1990
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Alfredo Alvarado
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Dissector device
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Patent number 4,815,465
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Issue date Mar 28, 1989
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Alfredo Alvarado
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Surgical stapling
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Patent number 4,583,670
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Issue date Apr 22, 1986
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Alfredo Alvarado
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
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Surgical stapler
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Patent number 4,047,654
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Issue date Sep 13, 1977
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Alfredo Alvarado
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE