Inventor
CHISHOLM ALEXANDER
US2 patents
Patents
2 patentsUS7831933B2Nov 9, 2010
Method and system for implementing a user interface for a device employing written graphical elements
LEAPFROG ENTPR INC21 citations89
US7453447B2Nov 18, 2008
Interactive apparatus with recording and playback capability usable with encoded writing medium
LEAPFROG ENTPR INC17 citations80