§ 295. Presumption: Product made by patented process

In actions alleging infringement of a process patent based on the importation, sale, offer for sale, or use of a product which is made from a process patented in the United States, if the court finds—

• (1) that a substantial likelihood exists that the product was made by the patented process, and
• (2) that the plaintiff has made a reasonable effort to determine the process actually used in the production of the product and was unable to so determine,