    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-learning books for  toddlers and preschoolers .