SAN FRANCISCO — An East Bay businessman has been found guilty of stealing trade secrets from the industrial giant DuPont and selling them to China as part of an economic espionage conspiracy.

On the fifth day of deliberations, a San Francisco jury handed federal prosecutors a complete victory on a 22-count indictment. Walter Liew, 56, was also convicted on Wednesday of possessing trade secrets, filing false tax returns and witness and evidence tampering, among other charges. He stood trial with business partner Robert Maegerle, a 78-year-old former DuPont engineer who was convicted on charges including trade secret theft and witness and evidence tampering.

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