Ip Sing Au — 2 Patents at Vtech Electronics

Ip Sing Au has been granted 2 US patents while listed as an inventor at Vtech Electronics. The first was granted in 1995 and the most recent in February 2006. Ip Sing Au ranks #1,709,992 of 4,157,543 US inventors in our database (top 41.1%). Patent records list Ip Sing Au in Tsuen Wan, CN.

Issued Patents All Time

Showing 1–2 of 2 patents

Patent #	Title	Co-Inventors	Date
6994556	Electronic educational apparatus incorporating the detection of objects	—	2006-02-07
5478268	Electronic educational toy apparatus	—	1995-12-26

Ip Sing Au — 2 Patents

Issued Patents All Time

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