    Sentence 1: The Emeryville-based toy company  filed suit Friday in federal court in Wilmington ,  Del . , claiming Fisher-Price is violating its 1998  Patent on interactive learning books for  toddlers and preschoolers .    Sentence 2: The Emeryville-based toy company  filed suit Friday claiming Fisher-Price is  violating its 1998 patent on interactive-leaming  books for toddlers and preschoolers .