WH

William K. Hilfiker

📍 Eureka, CA: #1 of 4 inventorsTop 25%
🗺 California: #676 of 10,592 inventorsTop 7%
Overall (1989): #13,132 of 140,708Top 10%
2
Patents 1989

Issued Patents 1989

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
4856939 Method and apparatus for constructing geogrid earthen retaining walls 1989-08-15
4834584 Dual swiggle reinforcement system 1989-05-30