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.
A patch code needs to be printed in a certain position, usually near the leading edge (feed-edge) of the document. This will vary depending upon the model of scanner used, and the orientation of the page. For this reason patch codes are often printed on all four edges of the page. Some scanners (such as the Kodak i800) require the patch code to be printed parallel to the feed-edge, other scanners (such as the Kodak i5000) require the patch code to be perpendicular (at right angles) to the feed-edge.
A 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. A common use now is to use the Patch T code or the Patch 2 code as a Page (document) separator.
Note that no data is encoded in a patch code. Similarly
although there may be 4 identical patch codes on a page (one in each
orientation) patch code readers (hardware or software) would only ever return
It is possible to incorporate a patch code into a form (typically a Patch 2 code on the first page of the form), to indicate a new file should be started for each form.
The exact action taken on recognising a patch code will depend upon the
system and software used, and may be configurable in a given application.
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.
A typical Patch Code layout, with the patch code at each edge of the document.
A Patch Code layout for scanners requiring the patch code at right angles . A Patch Code layout suitable for multiple types of scanners .
Patch Codes are wide/narrow 1D barcodes (as are Code 39 barcodes, for
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