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I found a website (C-DAC) in India that performs prior art searches for free. But, you have to live in India to register and request for a search. Are there any other prior art search services for free?

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patents.google.com has an 'find Prior art' button. Have you tried it? It doesn't do the best job but it provides helpful first steps.

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Here are a few key resources: Patexia Patent Database

The United States Patent and Trademark Office (USPTO):

World Intellectual Property Organization (WIPO):

European Patent Office (EPO): EPO offers information about patents in Europe, including Espacenet, a searchable database of more than 70 million patent documents worldwide, from 1836 to today.

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