SAN FRANCISCO — After landing a preliminary injunction in a patent suit, blood glucose testing company LifeScan Inc. took an "impermissible shortcut" by using confidential information turned over in litigation to notify the defendants' distributors, U.S. District Judge William Orrick III ruled Wednesday.

Shasta Technologies, Decision Diagnostics Corp., PharmaTech Solutions and Conductive Technologies are seeking sanctions against Johnson & Johnson subsidiary LifeScan because it notified their distributors of a preliminary injunction issued earlier this year that barred sales of their products. Two weeks later, the injunction was stayed by the U.S. Court of Appeals for the Federal Circuit.