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Patent applications and USPTO patent grants for Chen; Da Wei David.The latest application filed is for "battery-powered pump for liquid sprayer".
Patent | Date |
---|---|
Battery-powered pump for liquid sprayer Grant 7,207,500 - Hudson , et al. April 24, 2 | 2007-04-24 |
Battery-powered pump for liquid sprayer App 20060076435 - Hudson; William A. ;   et al. | 2006-04-13 |
Battery-powered spray wand App 20060013709 - Hudson; William A. ;   et al. | 2006-01-19 |
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