This paper examines international patent application decisions of nine agricultural biotechnology firms from 1990–2000 in Australia, Brazil, Canada, China, the European Patent Office, Japan and South Africa. The data reveal a low frequency of international applications despite an initial United States' application, indicating very low values for patents abroad. The results indicate that invention quality plays an important role in firms' decisions to patent abroad and that a single international application is a good predictor of multiple international applications. Further, significant country fixed effects suggest wide differences in business climates and patent enforcement among countries.