A Chinese-born American has been sentenced to four years in prison for stealing trade secrets from Motorola Inc, according to AP. A U.S. District judge found Hanjuan Jin guilty in February of taking more than 1,000 confidential documents from the Motorola office where she worked before trying to board a flight to China. The software engineer was stopped during a security search at Chicago\'s O\'Hare International Airport in February 2007. Prosecutors said the secrets she carried included descriptions of a walkie-talkie type feature on Motorola cellphones. Jin\'s lawyers said she took the files merely to refresh her knowledge after a long absence from work.