pat2pdf

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PAT2PDF - Free PDF copies of patents: Download and print!
Download and print a PDF copy of
any U.S. patent, for free, through the use of a simple web form.
Multiple patents can be obtained by separating requests with a semicolon.
Design patents, patent patents, pre-grant publications, re-issues, and
statutory invention registrations are all included.

http://www.pat2pdf.org/

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如同时查多个专利,每个专利用;隔开.