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Knock-out reference

Smith Hopen Intellectual Property Term Glossary Definition for Knock-out reference
A slang term for a prior art reference that is so identical to an invention for which patent protection is sought as to render futile all further pursuit of the patent. If there is a knock-out reference that will prevent the patenting of an invention, a patentability search should find it and the cost of filing a patent application should be avoided.

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