SAN FRANCISCO — Patent lawyers say they will be curious to see the results of what Google Inc. terms an experiment in patent purchasing. The company’s open call for patents Monday is meant to keep them from being used by others to launch patent litigation. But lawyers say there may be some additional benefits for the company, both in potential litigation and in its business.

The company invites patent holders to set an initial price for their patents through its “Patent Purchase Program” during a two-week period in May.