This paper explores the influences of patent performance, R&D capability, and employee productivity upon firm performance. This study uses patent intensity, revealed technology advantage in the most important technological field (RTAMIT), and average output per employee as the proxy variables of patent performance, R&D capability, and employee productivity in the American chemical industry. The results indicate that patent intensity, RTAMIT, and average output per employee of firms are positively associated with their performance. This study verifies that patent performance, R&D capability, and employee productivity positively affect firm performance.