MPEP 2164: Enablement and the Wands Factors

Answer in brief

MPEP 2164 requires the specification to enable a person skilled in the art to make and use the full scope of the claimed invention without undue experimentation. Whether experimentation is undue is judged by the eight In re Wands factors.

What MPEP 2164 covers

Enablement is measured as of the filing date.

Wands factors (2164.01(a)): breadth of the claims; nature of the invention; state of the prior art; level of ordinary skill; level of predictability in the art; amount of direction provided by the inventor; existence of working examples; quantity of experimentation needed.
How to make (2164.01(b)) and how to use (2164.01(c)) the invention.
Working and prophetic examples (2164.02); unpredictable arts need more disclosure (2164.03).

How examiners use it

Enablement rejections are most common in unpredictable arts such as biotechnology and pharmaceuticals, especially for broad genus claims.

On the patent bar

Know the Wands factors and that the test is undue experimentation, not any experimentation.

Read the full text

Official title: The Enablement Requirement [R-11.2013].

Read MPEP 2164 in full on Wysebridge ↗

Or at the source: USPTO MPEP § 2164.

Questions & answers

What are the Wands factors?

Breadth of the claims, nature of the invention, state of the prior art, level of ordinary skill, predictability of the art, direction provided, working examples, and quantity of experimentation needed.

Sources for this entry

USPTO — MPEP § 2164 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 2163: Written Description Requirement MPEP 2173: Indefiniteness Under 35 U.S.C. 112(b)

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Cite or share this entry

MPEP.net. “MPEP 2164: Enablement and the Wands Factors.” Wysebridge Reference. Content reviewed 9 November 2026.
https://mpep.net/mpep-2164/