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Robert V. Colangelo

ACAmerican Colloid: 2 patents #15 of 49Top 35%

Chicago, IL: #5,168 of 13,327 inventorsTop 40%

Illinois: #34,584 of 84,256 inventorsTop 45%

Overall (All Time): #2,323,302 of 4,157,543Top 60%

2 Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
4936386	Method for sealing well casings in the earth	—	1990-06-26
4919989	Article for sealing well castings in the earth	—	1990-04-24