Assignee Composition

The composition of patent assignees reveals fundamental shifts in who participates in the US patent system. Over five decades, three interrelated trends have reshaped the landscape: the progressive corporatization of patenting, the transition from domestic to foreign-majority filings, and the sequential entry of new national origins led by Japan, South Korea, and China. These structural changes reflect broader geopolitical shifts in research and development investment and the internationalization of technology-intensive industries.

This chapter examines the system-level composition of patent assignees, from the dominance of corporate entities to the geographic rebalancing of the patent system. The following chapter turns to the individual firm rankings and output trajectories that underlie these aggregate patterns.

The substantial majority of patents are held by corporations. Over the decades, the share of patents assigned to companies has grown steadily, while individual inventors constitute a progressively smaller fraction. IBM leads all organizations in cumulative patent grants.

The corporatization of patenting constitutes one of the most pronounced long-term trends. In the late 1970s, government entities held a modest share (~4%) of patent grants. By the 2020s, large corporations account for the substantial majority of all grants.

The national origin of US patent holders has shifted substantially over five decades. In the late 1970s, over 60% of US utility patents were granted to domestic assignees. By the 2020s, that share had declined to below half, with foreign assignees averaging 50–55% and the largest increases attributable to South Korean and Chinese assignees, particularly in electronics and telecommunications.

The route by which a patent application reaches the USPTO — domestic filing, direct foreign filing, or the Patent Cooperation Treaty (PCT) route — reveals the internationalization of patent prosecution strategy. The PCT route, which entered force in 1978, has grown from negligible use to over one-fifth of all US patent grants by 2024.

The patent prosecution market is served by specialized law firms that prepare and file applications on behalf of inventors and assignees. The degree of concentration among these firms — measured by the CR4 and CR10 ratios (the share of patents handled by the top 4 and top 10 firms) — reveals whether the market is becoming more or less concentrated over time.

The assignee landscape has undergone a structural transformation over five decades. Corporate entities now dominate patenting, foreign assignees have surpassed domestic filers, and sequential waves of international entry have reshaped the geographic composition of the patent system. These system-level trends set the stage for examining the organizational patent output rankings and trajectories that underlie the aggregate patterns documented here.