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Richard Douglas Barkley

UNUnknown: 1 patents #29,356 of 83,584Top 40%
Williamsburg, CA: #1 of 1 inventorsTop 100%
Overall (All Time): #2,011,194 of 4,157,543Top 50%
2 Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
9402418 Apparatus and method for rolling cigarette filters — 2016-08-02
5020807 Projectile board — 1991-06-04

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