YM

Yuen Po Man

LR Learning Resources: 2 patents #7 of 25Top 30%
Overall (All Time): #2,082,727 of 4,157,543Top 55%
2
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
8611192 Elapsed time clock Nancy Balter 2013-12-17
5851118 Digital and analog teaching clock Richard Woldenberg 1998-12-22