Background
Signature Financial Group held a patent on a computerized system for managing a “hub and spoke” mutual fund investment structure — a financial vehicle in which multiple individual mutual funds (the “spokes”) pool their assets into a single investment portfolio (the “hub”). The patent covered the data processing system that calculated each fund’s share of the hub’s income, gains, and losses on a daily basis for tax and accounting purposes. State Street Bank sought to use a similar structure without licensing Signature’s patent, challenging its validity on grounds that it claimed an unpatentable mathematical algorithm or business method.
The district court found the claims invalid on both grounds — the mathematical algorithm exception and the longstanding “business method exception” to patentability. Signature appealed.
The Court’s Holding
The Federal Circuit reversed, holding the claims patent-eligible. Judge Rich’s opinion made two significant rulings: (1) it expressly abolished the “business method exception” to patentability — finding no historical or statutory basis for a categorical exclusion of business methods from patent eligibility; and (2) it held that a computerized system is patent-eligible if it produces a “useful, concrete, and tangible result” — rejecting the view that mathematical algorithms are categorically excluded regardless of whether they transform data into a useful, concrete, tangible result like a final share price.
The court found Signature’s hub-and-spoke financial data processing system produced a useful, concrete result (accurate daily share prices for the mutual funds) using a specific computer system and data processing architecture — making it patent-eligible regardless of the fact that the system performed mathematical calculations to achieve those results.
Key Takeaways
- The Federal Circuit in 1998 eliminated the “business method exception” to patentability — holding that business methods implemented in computer systems are not categorically excluded from patent protection, opening the door to a wave of internet and e-commerce business method patents in the late 1990s and 2000s.
- The “useful, concrete, and tangible result” test from State Street was the governing standard for software and business method patent eligibility from 1998 through Alice v. CLS Bank (2014) — a permissive standard under which most software producing any practical computational result was patent-eligible.
- The decision is historically significant as the catalyst for the proliferation of business method and e-commerce patents in the early internet era — patents on one-click purchasing, reverse auctions, financial data processing, and countless other internet business models were filed and issued in the post-State Street environment.
- State Street was effectively overruled by the combination of Bilski v. Kappos (2010) and Alice v. CLS Bank (2014), which rejected the useful/concrete/tangible result test and established the two-step Alice/Mayo framework still used today for software and business method patent eligibility.
Why It Matters
State Street Bank v. Signature Financial was one of the most consequential — and eventually controversial — patent decisions of the late 20th century. By opening the door to business method patents and establishing a permissive “useful, concrete, tangible result” test for software eligibility, the Federal Circuit unleashed a wave of business method and internet patent filings that fundamentally changed the patent landscape for the emerging digital economy.
The decision created the conditions for the “patent troll” era of the 2000s and 2010s: countless patents on internet business methods, e-commerce processes, and financial software were issued under the State Street standard, many of which were later challenged as obvious or abstract. The eventual repudiation of State Street’s useful/concrete/tangible result test by Alice v. CLS Bank in 2014 represented a fundamental correction — but the legacy of State Street remains in the thousands of pre-Alice business method patents that continue to be asserted and litigated under the current Alice framework.