Definition
A "new and useful invention" is the foundational statutory requirement an invention must satisfy to qualify for patent protection in the United States. The phrase combines two independent conditions:
1. NEW: The invention must not have been previously known, used, patented, or described in a printed publication before the applicant's effective filing date. Novelty is assessed against the prior art — everything publicly known before the relevant date. An invention that duplicates existing knowledge, even unknowingly, fails this requirement.
2. USEFUL: The invention must have a practical, real-world utility. It must be capable of doing something beneficial. This is a low threshold in modern practice — minor or modest utility is sufficient — but the utility must be genuine and specific, not speculative or inoperable. An invention that cannot work as described, or that serves only a frivolous or harmful purpose, fails this requirement.
Together, these two conditions form the bedrock threshold of patentability, distinct from the additional requirements of non-obviousness and adequate written description that also govern whether a patent will issue.
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Common Language
Modern common usage (Wiktionary): "New" means not existing before; recently made, discovered, or created. "Useful" means capable of being used for a practical purpose; beneficial or helpful.
Historical common usage (Webster's 1913): "New" — not before seen or known; novel; of recent origin. "Useful" — capable of use; serving some purpose; producing or having power to produce good.
The common meanings are not wrong, but they undersell the legal precision involved. In patent law, "new" is a term of art with a formal prior art framework — something can be subjectively novel to the inventor yet legally "old" if it was publicly described anywhere in the world before the filing date. Similarly, "useful" is not an evaluative judgment about how good or superior the invention is; it is a minimum threshold test excluding only inventions that are inoperable, purely frivolous, or designed solely for harmful purposes.
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Common Confusion
"New and useful" is sometimes read as a single blended standard, but courts and the Patent Office treat novelty and utility as separate, independent inquiries. An invention can be entirely new yet fail on utility (e.g., a perpetual motion machine that cannot work), and theoretically an invention can have genuine utility yet fail on novelty if it was publicly disclosed before the critical date.
Researchers should also distinguish the "new and useful" threshold from non-obviousness (35 U.S.C. § 103). Non-obviousness asks whether the invention would have been obvious to a person of ordinary skill in the art at the time — a harder standard than mere novelty. Failing non-obviousness is the most common ground for patent rejection, but it is analytically separate from the "new and useful" inquiry.
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Core Elements
The utility requirement (usefulness) has three sub-components as developed in modern patent law:
- SPECIFIC UTILITY: The invention must have a specific, substantial, and credible utility — not merely a general or theoretical benefit. This standard became particularly significant in biotechnology and pharmaceutical patent disputes.
- SUBSTANTIAL UTILITY: The utility must be real and not de minimis. An invention with only a trivial application may still satisfy this element in most cases, but purely frivolous inventions do not.
- CREDIBLE UTILITY: The claimed utility must be believable given the state of the art. An extraordinary claim requires proportionally credible support.
The novelty requirement rests on a different analytical structure governed by the prior art framework under 35 U.S.C. § 102, which specifies exactly which prior disclosures, uses, patents, and publications defeat novelty and when.
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Why It Matters in Research
The phrase "new and useful invention" appears in the United States Constitution (Article I, Section 8, Clause 8) and in the patent statutes (35 U.S.C. § 101), giving it both constitutional and statutory dimensions. Researchers working in early patent law must understand that the standards for both "new" and "useful" have evolved substantially since the founding era.
In the nineteenth century, "useful" carried more moral freight — courts occasionally refused patents for inventions deemed contrary to public morals or useful only for illegal purposes. That moralistic dimension has largely fallen away in modern practice, though it surfaces in historical sources and in occasional academic commentary.
The novelty standard underwent dramatic revision with the America Invents Act of 2011, which shifted the United States from a first-to-invent system to a first-inventor-to-file system. Researchers reading pre-2013 materials must be alert to this transition: "prior art" under the old § 102 operated differently than under the current statute, and cases and treatises from before 2013 describe a legal landscape that no longer fully applies.
Historical corpus materials — including nineteenth-century patent digests, circuit court decisions, and Commissioner of Patents annual reports — frequently discuss the utility and novelty requirements in ways that reflect now-superseded doctrine. The Black's entry (citing 1 Mason, 182, a Circuit Court opinion by Justice Story) exemplifies this: its framing of "real utility" versus "frivolous or mischievous inventions" reflects an older moral-utility framework that modern doctrine has largely refined away.
The phrase also appears in interference proceedings (now largely replaced by inter partes review), in reissue and reexamination contexts, and in international patent law comparisons where "industrial applicability" (the European and international equivalent of utility) requires its own separate analysis.
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Historical Dictionary Support
Black's Law Dictionary captures the phrase accurately for its era. Its reference to 1 Mason, 182 — a circuit decision by Justice Story — anchors the utility requirement in the proposition that "useful" demands real utility rather than superiority over existing solutions, and excludes only frivolous or mischievous inventions. This framing was standard through the nineteenth and early twentieth centuries.
What Black's does not capture is the elaboration of specific, substantial, and credible utility that emerged from mid-twentieth century and later decisions, particularly as biotechnology patents forced courts to define what "utility" actually requires for nascent or partially characterized inventions. Nor does it address the structural distinction between the constitutional grant and the statutory implementation that has informed more recent scholarship.
Historical dictionaries also tend to treat "new" in the patent context as relatively intuitive — an invention was new if it was not previously known or used. The detailed statutory machinery governing what counts as prior art, grace periods, and international disclosures is largely invisible in pre-twentieth century dictionary treatments. Researchers should not rely on historical dictionary formulations of "new and useful" as a guide to modern patent prosecution.
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Jurisdictional Note
The "new and useful invention" standard is a federal matter in the United States — patent law is exclusively federal under Article I, Section 8, Clause 8, and the Patent Act. State law plays no role in defining or applying this standard. However, comparable requirements appear in every major patent system globally, with "industrial applicability" serving as the functional equivalent of "useful" under the European Patent Convention and the Patent Cooperation Treaty. International patent researchers must recognize that the specific tests and thresholds differ and are not interchangeable with U.S. doctrine.
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