Anticipation

Anticipation is a ground of patent invalidity under 35 U.S.C. § 102. A claim is anticipated — and therefore invalid — if every element of the claim is disclosed in a single prior art reference. The reference must disclose each and every limitation of the claim, either expressly or inherently. Anticipation requires no creativity or combination: if one document, one product, or one prior use already discloses the entire invention, there is nothing patentably new. The standard is strict: if even one claim element is absent from the reference, the reference cannot anticipate that claim (though it may still be used in an obviousness combination).

Inherent anticipation occurs when a prior art reference necessarily performs a claim element even though it does not explicitly disclose that element. The classic formulation: a prior art reference anticipates if a person of ordinary skill in the art would recognize that the reference must perform or have the claimed property — not that it might or could, but that it necessarily does. Schering Corp. v. Geneva Pharmaceuticals (Fed. Cir. 2003): the metabolism of a prior art drug to produce a claimed active metabolite was inherent even though the original reference did not discuss the metabolite. Titanium Metals Corp. v. Banner (Fed. Cir. 1985): a prior art publication disclosing a titanium alloy composition inherently anticipated claims to that alloy even without disclosing the claimed corrosion resistance property, because the property necessarily followed from the composition. Inherent properties need not be recognized at the time of the prior art — they need only necessarily exist.

Anticipation (§ 102) and obviousness (§ 103) are distinct invalidity grounds: ANTICIPATION requires a SINGLE reference to disclose EVERY element of the claim. No combining, no reasoning, no motivation needed — just one reference with the complete disclosure. OBVIOUSNESS requires that a person of ordinary skill would find it obvious to COMBINE multiple references (or one reference + background knowledge) to arrive at the claimed invention. Obviousness requires a motivation to combine and an expectation of success. The practical difference: if the reference 'almost' discloses the claim but is missing one element, there is no anticipation; the question becomes whether the missing element would have been obvious to add. A reference that anticipates necessarily renders obvious (anticipation is the extreme case of obviousness), but the reverse is not true.

Yes. A prior art reference that teaches a claimed invention must be enabling — it must teach a person of ordinary skill how to practice the claimed invention — to constitute anticipatory prior art. In re Hafner (CCPA 1969) and later cases established that non-enabling disclosures (e.g., a document that describes a molecule but does not disclose how to make it) do not anticipate. However, the enablement standard for prior art is lower than for patent applications: the prior art need only enable someone to make and use the invention; it need not satisfy the same written description requirements as the patent application itself. A prior art product sale or public use anticipates regardless of enablement — what matters is that the product was available.

For genus-species anticipation: (1) A PRIOR ART GENUS does NOT necessarily anticipate a CLAIM TO A SPECIES — if the genus is broad enough that the specific species is not immediately apparent, the genus reference does not inherently disclose the species. But if the genus is narrow enough that a person of ordinary skill would immediately envisage the specific species, it may anticipate. (2) A PRIOR ART SPECIES DOES anticipate a CLAIM TO A GENUS if the claim is drawn broadly enough to encompass the specific species — because the genus claim covers that species, and the species was already disclosed. This asymmetry is important: patent applicants cannot claim broad genera to preempt narrower disclosed species by competitors.