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I want to download thousands of patent documents in PDF format for a patent search system. I want them in zipped files which have thousands of patents.

Does Google bulk patent provide this?

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Yes, google makes several different downloads available in a zip format. This data is from the USPTO and does not include OCR'd version of older patents.

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Do the googled ziped format contains patents in zipped format .. @George White – Ragesh D Antony Feb 4 '14 at 3:27
If you follow the link you can see what types of files are available. Rather thn PDF, the full image patents are tiffs. It looks like they are grouped by the week of issue. – George White Feb 4 '14 at 7:23

Use the following iMacros plugin script to download PDFs of every patent on a Google patents search results page:

TAG POS={{!loop}} TYPE=A ATTR=TXT:Overview

So, suppose your search is . This patent search returned 94 results, so I make sure "num=100" (or any number ≥94). Change the "Max" field of iMacro's "Play" tab to the number of results (94 in this example) and click the "Play (Loop)" button. iMacro will download all the PDFs. ☺

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