SAN JOSE — An intellectual property trial between Silicon Valley sister companies OptumSoft Inc. and Arista Networks Inc. is set to wind down Wednesday morning, following the third day of testimony from Arista's chief software engineer.

Santa Clara County Superior Court Judge Peter Kirwan postponed closing arguments, which had been set for Thursday, and asked for post-trial briefing from both sides. The judge also pushed back testimony from expert witnesses.

The bench trial centers on a software licensing agreement between OptumSoft and Arista—two companies with strong ties to early Google Inc. investor and Silicon Valley billionaire David Cheriton. In 2004 OptumSoft, which Cheriton founded, granted Arista free access to a software development tool that Cheriton had invented to automatically generate code faster and more accurately than a human engineer. In return, Cheriton required Arista to hand over improvements made to the platform, known as TACC, which was still in the early stages of development.