DS

Douglas F. Silk

HH Hengestone Holdings: 2 patents #3 of 10Top 30%
📍 Whitby, CA: #79 of 267 inventorsTop 30%
Overall (All Time): #2,202,340 of 4,157,543Top 55%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
6565062 Apparatus for the splitting of cast concrete dual blocks Terry P. Steeves 2003-05-20
6226954 Process and apparatus for the splitting of cast concrete dual blocks Terry P. Steeves 2001-05-08