Qualcomm is putting the value of its patent portfolio on the line in a California courtroom to try and make Apple pay for using the chipmaker’s technology, which it links to the iPhone’s success.

This move represents the first time a US jury will deliberate in the long-lasting global battle between the tech giants in which Qualcomm alleges that Apple infringed patents related to technology for graphics processing and battery power conservation, which Qualcomm say improve the efficiency and reduce the cost of smartphones.

An award by jurors would undermine Apple’s claims that the chipmaker overcharges for its patent portfolio and may make the iPhone and iPad maker an incentive to negotiate a conclusive settlement to their dispute. The trial started Monday in San Diego’s Federal court and is scheduled to take two weeks.