| http://www.w3.org/ns/prov#value | - byCiting PatentFiling datePublication dateApplicantTitleUS6668156 *Feb 5, 2001Dec 23, 2003Leapfrog Enterprises, Inc.Print media receiving unit including platform and print mediaUS6899335Nov 7, 2002May 31, 2005Carla G. WilsonMethod and apparatus for a learning systemUS6974327 *Mar 31, 2004Dec 13, 2005Roy Harold TimpeDouble imputation scaleUS7039355Mar 11, 2003May 2, 2006Leapfrog Enterprises, Inc.P
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