The Manual of Patent Examining Procedure, explainedReviewed 9 November 2026
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Topics

MPEP.net is organized into 8 topics. Each topic collects the practical entries that answer one part of the question.

MPEP basics

What the MPEP is, which edition is current, and how it is organized.

Chapters

Every MPEP chapter, and close reads of the ones that matter most.

Eligibility, claims and prior art

MPEP sections on subject matter eligibility, claim interpretation, inherency and anticipation (Chapter 2100).

Obviousness

MPEP 2141 to 2145: the Graham inquiries, the KSR rationales, motivation to combine, ranges and rebuttal.

Disclosure and claim form

Written description, enablement, indefiniteness, means-plus-function, and claim and abstract form under 35 U.S.C. 112.

Prosecution and procedure

IDS, benefit claims, rejections, interviews, amendments, declarations, restriction, double patenting and reexamination.

Concepts

Ideas that run across several MPEP sections: intended use, teaching away, hindsight and official notice.

MPEP for the patent bar

Using the MPEP on the open-book USPTO registration exam.