JH

John Helfrick

🗺 Virginia: #268 of 1,348 inventorsTop 20%
Overall (1994): #113,998 of 165,921Top 70%
1
Patents 1994

Issued Patents 1994

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
D351489 sifting tray for use with a litter pan 1994-10-11