"A Chinese-born engineer was convicted in federal court in California yesterday of being an unregistered Chinese agent who conspired to supply defense technology to Beijing. Chi Mak, 66, was found guilty of helping provide China unclassified but export-controlled information, including data on a submarine electronic system and a quiet electronic propulsion system planned for future warships. Mak was found guilty of conspiracy to violate export regulations and for failing to register as a Chinese agent, after several days of deliberations. The trial lasted six weeks. "We were confident from the start, and we're very happy with the verdict," Assistant U.S. Attorney Greg Staples said. Sentencing was set for Sept. 10, and Mak faces up to 35 years in prison. Mak at first showed no emotion when the verdict was read but then appeared to fight tears as defense attorney Marilyn Bednarski teared up and rubbed his back. "