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A prior art search can be useful in unearthing prior art that can invalidate the patent. Tran & Associates provides a free search tool called Patent Viewer that can be used to do prior art research. Additionally, the prior art search can be performed using a keyword search of large patent databases, scientific papers and publications, and on Google. However, since some obscure publication from a remote corner of the world may have disclosed the invention in a language that is not common, it is virtually impossible to have a fool proof prior search. Thus, some inventors have used quick prior art search as a “sanity check” before investing time and resource into applying for patents and developing products/services around their invention.