YZ

Yu Zheng

📍 Topsfield, MA: #2 of 7 inventorsTop 30%
🗺 Massachusetts: #213 of 4,501 inventorsTop 5%
Overall (1997): #9,171 of 185,788Top 5%
3
Patents 1997

Issued Patents 1997

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDate
5664596 Collapsible play structures — 1997-09-09
5618246 Collapsible play tunnel structures — 1997-04-08
5605486 Three-dimensional model structures — 1997-02-25