SAN JOSE — Even as a jury deliberated on damages, Samsung Electronics Co. pleaded Wednesday with U.S. District Judge Lucy Koh to halt proceedings after the U.S. Patent and Trademark Office vetoed a key Apple Inc. patent in ex parte reexamination.

On Wednesday morning, the PTO issued an advisory action that affirmed its rejection of all claims of U.S. Patent No. 7,844,915, according to court papers. The patent, which covers Apple’s “pinch-to-zoom” feature, is the only one for which the Cupertino-based company can try to recover lost profits, which account for more than $113 million of its nearly $380 million request for damages.