Patch codes are a set of 6 distinct barcode patterns (1, 2, 3, 4, 6 and T) that are typically used as document separators when scanning.
The most typical use of a patch code is distinguish where one document ends and another begins when a pile of documents are loaded into the sheet-feeder (ADF) of a document scanner.
The patch code was originally created by Kodak to signal document processing applications while reading large documents. The different codes will signal certain events such as a page/section break or a change from single sided to duplex scanning. Six distinct barcode patterns (Patch 1, 2, 3, 4, 6 and T) were defined. The most common use now is to use the Patch T code as a Page (document) separator.
Note that no data is encoded in a patch code. Similarly
although there are typically 4 identical patch codes on a page (i.e. each
orientation) patch code readers (hardware or software) would only ever return
Download and print patches-for-printing-on-a4-paper.pdf
Download and print patches-for-printing-on-us-letter-paper.pdf
Patch code T is often used as a separator page between different documents when scanning.
Download and print a Patch-Code-T sheet as a separator page between different documents when scanning.
Patch Codes are wide/narrow codes (as are Code 39 barcodes, for example).
Thanks to Kodak for this further technical information about patch-codes.
* Patch Codes * Separator Pages * Batch Scanning * PDF Searchable Images scanning * TIF or PDF scanning