The Federal Circuit has issued a significant ruling in US Synthetic Corp. v. Int’l Trade Comm’n. It reversed the ITC’s controversial decision that had invalidated composition of matter claims as abstract ideas. This case provides an important clarification on patent eligibility under Section 101 and limits the expansive application of the abstract idea doctrine in composition claims.
Case Overview: ITC Invalidates Composition of Matter Claims Under Section 101
US Synthetic Corp. (USS) had patented polycrystalline diamond compacts (PDCs) used in drill bits. The claims defined the PDCs by their material properties, such as coercivity and thermal stability. The ITC had determined that these claims were abstract because they described the PDCs through functional properties rather than specific manufacturing steps.
This decision drew criticism from industry groups, including PhRMA, for expanding the abstract idea analysis into composition claims. Critics warned that the ruling could have undermined long-standing patent protections for chemical and material innovations.
Federal Circuit Reversal: Material Properties Are Not Abstract Ideas
Writing for a unanimous panel, Judge Chen rejected the ITC’s reasoning. The court affirmed that the claimed material properties were concrete and measurable rather than abstract.
The Federal Circuit emphasized that these properties are inherently tied to the PDC’s physical structure. The court stated that they are “integrally and necessarily intertwined” with the composition itself.
The ITC’s position was that these characteristics were mere “side effects” of manufacturing. However, the Federal Circuit ruled that they meaningfully define the PDC’s structure and composition.
Distinguishing Composition Claims from Software Patent Eligibility
A key takeaway from the decision is that defining a composition of matter by its properties differs from claiming an abstract idea.
Functional limitations alone may be problematic in software patents. But chemistry and materials science inventions often rely on measurable properties to describe structure. The court made clear that this distinction matters under Section 101.
Key Takeaways on Section 101 Patent Eligibility
This decision preserves decades of precedent allowing composition claims to be defined by physical and material properties. The ruling clarifies several important principles.
Material Properties Can Serve as Valid Claim Limitations
When claimed properties correlate with structure, they can function as legitimate definitional elements rather than abstract concepts.
A Perfect Correlation Between Property and Structure Is Not Required
The court acknowledged that no property is a perfect proxy for a composition’s structure. However, a reasonable correlation is sufficient to support patent eligibility.
Issued Patents Are Presumed Valid Under Section 101
The Federal Circuit reaffirmed that issued patents are presumed valid, including with respect to eligibility. The court criticized the ITC for applying an incorrect burden of proof to USS.
Limited Scope: A Narrow but Important Patent Eligibility Ruling
Although this ruling strengthens patent eligibility for chemical and material compositions, it offers little relief for software-related claims.
The court explicitly distinguished this case from software patents, noting that software’s functional limitations are often untethered to physical structures.
The decision also leaves open the broader question of when a composition of matter claim could be considered abstract. Rather than establishing a rigid test, the court provided guidance through example and preserved flexibility for future cases.
Practical Implications for Patent Prosecutors and Litigators
The court’s reversal is a significant win for industries that depend on composition of matter patents, including pharmaceuticals and materials science.
By reinforcing that material properties can define structure, the ruling protects the enforceability of many existing patents.
For patent practitioners, the case underscores the importance of clearly explaining how claimed properties relate to physical structure in the specification. Careful drafting may prove decisive in future Section 101 challenges.
Related patent eligibility articles: USPTO AI subject matter eligibility guidance