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Helen J. Yoo
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San Francisco, CA, US
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last 30 patents
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Patent Grant
Pyrotechnic drop mechanism for power tools
Patent number
8,424,429
Issue date
Apr 23, 2013
Power Tool Institute
William R. Knapp
B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Patent Grant
Pyrotechnic drop mechanism for power tools
Patent number
8,074,546
Issue date
Dec 13, 2011
Power Tool Institute
William R. Knapp
B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
Information
Patent Grant
Pyrotechnic drop mechanism for power tools
Patent number
7,628,101
Issue date
Dec 8, 2009
Power Tool Institute
William R. Knapp
B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR