SAN FRANCISCO — Intellectual Ventures has asked a federal judge in Delaware to disqualify Wilson Sonsini Goodrich & Rosati from defending a software company in one of the first infringement suits the patent hoarding company filed.

In papers filed Wednesday before U.S. District Judge Leonard Stark, lawyers for IV said Wilson had “unfettered access” to its secrets until it stopped representing IV almost two years ago, and shouldn’t now be allowed to represent IV’s adversaries.