SD

San-Tong Day

Overall (All Time): #1,670,496 of 4,157,543Top 45%
3
Patents All Time

Issued Patents All Time

Showing 1–3 of 3 patents

Patent #TitleCo-InventorsDate
4823821 Automatic single push button type umbrella — 1989-04-25
4548222 Full-automatic umbrella — 1985-10-22
4534374 Fully automatic single push button type umbrella — 1985-08-13