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Bill Butterfield — 1 Patent

California: #247,236 of 386,348 inventorsTop 65%
Overall (All Time): #2,946,388 of 4,157,543Top 75%
1 Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
9657470 Dual flush toilet flapper valve system — 2017-05-23

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