DC

David Chai

Overall (All Time): #2,252,286 of 4,157,543Top 55%
2
Patents All Time

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #TitleCo-InventorsDate
5944435 Mechanical pencil structure 1999-08-31
5575031 Pilly remover 1996-11-19