What is the difference between ‘conception’ and ‘reduction to practice’ in a 37 CFR 1.131(a) affidavit?

In the context of a 37 CFR 1.131(a) affidavit, ‘conception’ and ‘reduction to practice’ are two distinct stages of invention: Conception is the formation in the inventor’s mind of a definite and permanent idea of the complete and operative invention. Reduction to practice can be either actual (physically creating the invention) or constructive (filing a…

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