Enter Identifying Codes to search the following fields within a record.

• Accession Number
• ISSN
• ISBN
• Patent Number
• Patent Class
• Patent Date Granted

Enter one or more codes connected with Booleans (AND, OR, NOT, and SAME). Enter complete codes or partial codes using wildcards (* ? $).

To display this field on the Search page, review the instructions for Add Another Field.

Identifying Codes Search Examples

• PREV200300465955 finds this record with this accession number.

• 0015-6639 finds records that have this ISSN identifier.

• 2-7380* finds records that begin with this ISBN identifier. For example, 2-7380-1000-8, 2-7380-0810-0, 2-7380-0716-3, etc.

• US 5889169 finds this patent record.

• US 6636757 OR US 6635071 finds both these patent records.

• 435-107 finds all U.S. patent records that fall within this patent class.

• September 09, 2003 finds all U.S. patent records that were granted on this particular date.

About the ISSN Identifier

The International Standard Serial Number is a unique eight-digit number that identifies periodical publications such as journals and electronic publications.

The format is four numbers, a hyphen (-), three numbers, and then a check character that may be a number or an X. Example: 0015-6639

About the ISBN Identifier

The International Standard Book Number is a unique machine-readable identifier that marks a book unmistakably.

The format is a 10-digit number that contains 3 hyphens (-). The last digit is a check character, which may be a number or an X. The position of the hyphens can vary for each ISBN identifier. Example: 2-7380-1000-8