MPEP Section 904.02(a), Classified Search

Executive summary:

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904.02(a) Classified Search

A proper field of search normally includes the subclass in which the claimed subject matter of an application would be properly classified. It is not necessary to search areas in which it could reasonably have been determined that there was a low probability of finding the best reference(s).

In outlining a field of search, the examiner should note every class and subclass under the U.S. Patent Classification system and other organized systems of literature that may have material pertinent to the subject matter as claimed. Every subclass, digest, and cross-reference art collection pertinent to each type of invention claimed should be included, from the largest combination through the various subcombinations to the most elementary part. The field of search should extend to all probable areas relevant to the claimed subject matter and should cover the disclosed features which might reasonably be expected to be claimed. The examiner should consult with other examiners and/or supervisory patent examiners, especially with regard to applications covering subject matter unfamiliar to the examiner.

The areas to be searched should be prioritized so that the most likely areas of finding relevant prior art are searched first.