SALEM, N.H. (Dow Jones/AP) – Amberwave Systems Corp., a privately held developer of chip technology, has filed a patent-infringement suit against Intel Corp.

Salem-based Amberwave claimed Monday that Intel is using its proprietary techniques as part of the “strained silicon” technology used in Pentium microprocessors.

On May 25, Intel sought a determination that it doesn’t infringe the patent.

Amberwave Monday filed a counterclaim against Intel’s action and said the litigation arose after Intel refused to negotiate a “commercially reasonable” license agreement.

An Intel representative wasn’t immediately available for comment.