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Freepatentsonline (FPO) is one of the easiest online tools to use. It is comprehensive for US patents, and also includes Japanese patents and a beta test of German patents.
You may also want to consult the Reliable Web Resources Research Guide for additional resources on patents.
The Chemical & Physical Property Data Research Guide also includes several links to patent offices, including the US, Canada, Europe, and Japan.
For help with patent searches, contact Nancy Curtis, Chemistry Subject Librarian.
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