MPEP 2112: Inherency

Answer in brief

Under MPEP 2112, a prior art reference can anticipate or render obvious a claim feature it never mentions, if that feature is necessarily present in what the reference describes. Probably or possibly present is not enough, and "an invitation to investigate is not an inherent disclosure".

What MPEP 2112 covers

Inherency lets an examiner rely on characteristics that flow naturally from the prior art, even if no one recognized them at the time.

Something old does not become patentable by discovering a new property or recognizing a latent benefit.
The examiner must give a basis in fact or technical reasoning that the feature necessarily flows from the prior art.
Once the examiner does, the burden shifts to the applicant to show the prior art product does not have the characteristic.
2112.01 covers composition, product and apparatus claims; 2112.02 covers process claims.

How examiners use it

Typical rejection: the reference discloses the same composition made the same way, so the claimed property is inherent. Applicants rebut with evidence, often a declaration, that the property is not necessarily present.

On the patent bar

Know the standard (necessarily present, not probably) and who carries the burden after the examiner sets out a reasoned basis.

Read the full text

Official title: Requirements of Rejection Based on Inherency; Burden of Proof [R-01.2024].

Read MPEP 2112 in full on Wysebridge ↗

Or at the source: USPTO MPEP § 2112.

Questions & answers

What is inherency in patent law?

A claimed feature is inherent in prior art when it is necessarily present in what the prior art describes, even though the prior art does not mention it.

Sources for this entry

USPTO — MPEP § 2112 USPTO
Official text of this section, Ninth Edition, Revision 01.2024.
Wysebridge MPEP Center Wysebridge (publisher of this site)
The full MPEP (9th Ed., Rev. 01.2024) free to read, with Wysebridge's estimated patent bar weight for each chapter.

Practical guidance is original editorial content. Company-published figures are the company's own claims and are labeled as such.

Continue this reading path

MPEP 2131: Anticipation Under 35 U.S.C. 102 MPEP 2113: Product-by-Process Claims

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Cite or share this entry

MPEP.net. “MPEP 2112: Inherency.” Wysebridge Reference. Content reviewed 9 November 2026.
https://mpep.net/mpep-2112/