Dawson Chemical Co. v. Rohm & Haas Co.

Background

A chemical company (Rohm & Haas) owns a patent on a method for using the herbicide propanil in rice cultivation. Other chemical manufacturers had been making and selling propanil before Rohm & Haas obtained its process patent. Rohm & Haas sued those makers for enabling farmers to practice the patented method. The District Court found Rohm & Haas guilty of patent misuse because it sold propanil and refused to license others; the Court of Appeals reversed and the Supreme Court took the case to resolve the statutory question.

Reasoning

The central question was whether selling an unpatented chemical that has no substantial noninfringing use, while refusing to license competitors, counts as patent misuse. The Court read 35 U.S.C. §271 together with the prior case law and legislative history. It noted §271(c) limits contributory infringement to nonstaple items and §271(d) lists patentee actions that are not to be treated as misuse. The majority concluded Congress intended to allow patentees some control over nonstaple components used only with a patented process, so Rohm & Haas’ sales and refusal to license did not constitute misuse under §271(d). The Court therefore allowed the patent owner to pursue claims against other manufacturers who supply the chemical.

Real world impact

The ruling makes it easier for owners of process patents on chemicals to sell the chemical themselves and to enjoin or sue competing sellers. It strengthens protection for developers of new chemical uses, especially in agriculture, and may reduce competition for nonstaple chemicals. The decision assumed the patent’s validity at this stage; separate validity and antitrust issues remain for lower courts to decide.

Dissents or concurrances

Four Justices dissented, arguing §271(d) does not clearly authorize this broad control and warning the majority’s view extends the patent monopoly into unpatented goods and weakens competition.