A three-day Chinese brand expo was held in Suzhou last week, attracting more than 500 companies from around the nation and covering fields of preschool education, food, clothing and household products. About 80 percent of the companies own national famous brands and trademarks of geographical indications. The annual event serves as a platform to showcase the efforts by companies to implement trademark strategy and help promote a corporate brand economy, said the local administration for industry and commerce.