BlackBerry alleges the Typo keyboard is an 'obvious knock-off' of its own keyboards.
Apple experts told a jury that Samsung's infringement was large and significantly hurt Apple.
Technical talk marked a day focused on the specifics behind one Apple patent
The Apple marketing chief is first to give testimony as the company clashes with Samsung
The two companies are due back in court on Monday to argue over smartphone patents.
Apple failed to provide enough evidence to warrant an injunction, so a judge ruled that legal damages should be sufficient.