JH

John Helfrick

🗺 Virginia: #18,729 of 34,511 inventorsTop 55%
Overall (All Time): #3,808,653 of 4,157,543Top 95%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

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