Summary Box: Proview warns dealers on iPad sales

NEW DEMANDS: The Chinese company challenging Apple’s use of the iPad brand name has demanded a halt to sales and distribution of the device in China.

THE THREAT: Shenzhen Proview Technology issued the demand in an open letter to iPad vendors and dealers in China and threatened “severe measures” against trademark infringements.

THE BACKDROP: Apple says it bought worldwide rights to the iPad trademark from Proview in 2009. It unveiled a new iPad on Wednesday.