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1851 MANUAL OFPATENT EXAMINING PROCEDURE<br />

STANDARD CODE FOR THE IDENTIFICA·<br />

TION OF DIFFERENT KINDS OF PATENT<br />

DOCUMENTS<br />

<strong>The</strong> Code is subdivided into mutually. exclusive<br />

groups of letters. <strong>The</strong> groups characterize patent doc-<br />

August 2001<br />

1800-66<br />

uments, nonpatent literature documents (N), and<br />

restricted documents (X). Groups 1-7 comprise letters<br />

enabling identification of documents pertaining to different<br />

publication levels.

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