By Rocky Berndsen, Head of Analytics

Continuation practice is a cornerstone of US patent law, allowing applicants to file new applications that claim priority to an earlier-filed parent application. While the mechanism itself is straightforward, the data reveals striking differences in how Patent 300® companies employ this strategy—and those differences tell a compelling story about corporate IP philosophy.

The High-Continuation Companies

At the top of the spectrum, several companies stand out for their exceptionally high continuation filing rates. Sonos leads the pack with approximately 88% of its patents originating as continuations. Other notable high-continuation filers include Edwards Life Sciences and eBay, both of which maintain continuation percentages well above industry averages.

Why do these companies lean so heavily on continuations? The reasons are strategic:

  • Fortifying market position: Continuations allow companies to build layers of patent protection around core innovations, making it harder for competitors to design around key technologies.
  • Building patent thickets: By filing multiple continuations from a single parent application, companies can create dense clusters of related patents that provide overlapping coverage.
  • Strategic layering: Continuations enable applicants to pursue different claim scopes over time, adapting their patent coverage as markets evolve and competitive threats emerge.

The Low-Continuation Companies

On the other end of the spectrum, several companies—particularly in the automotive sector—use continuations minimally. Companies like Subaru, Mazda, and Honda have among the lowest continuation rates in the Patent 300®.

Several factors explain this approach:

  • Rapid innovation cycles: In industries where technology evolves quickly, the value of filing continuations on older inventions may diminish before the continuation process yields results.
  • Budgetary constraints: Continuations add to patent portfolio costs. Companies that prioritize breadth over depth may choose to allocate their budgets to new filings rather than continuations.
  • Comprehensive initial filings: Some companies invest more heavily in thorough initial applications with broad claims, reducing the need for follow-on continuations.
  • Broader innovation footprint: Rather than building deep protection around a few core technologies, these companies may prefer to patent across a wider range of innovations.

Depth vs. Breadth in IP Strategy

The data highlights a fundamental tension in patent portfolio strategy: the balance between depth and breadth. Companies with high continuation rates are investing in deep, layered protection around their most valuable innovations. Those with low continuation rates are casting a wider net, seeking to protect a broader range of technologies with fewer layers per invention.

Neither approach is inherently superior. The right strategy depends on a company's competitive landscape, technology lifecycle, litigation exposure, and budget. What the data makes clear, however, is that continuation practice is far from uniform—and understanding where your organization falls on this spectrum can provide valuable insights for IP strategy planning.

For more data-driven insights into patent portfolio strategy, explore the Patent 300® analytics.