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Reduction to practice

In United States patent law, the reduction to practice is the step in the formation of an invention beyond the conception thereof. Reduction to practice may be either actual or constructive. The date of reduction to practice was critical to the determination of priority between inventors in an interference proceeding under the discontinued first-to-invent system as well as for swearing behind a reference under that system.

Some types of evidence
In addition to an inventor's notebook, several additional kinds of evidence can be used to establish an earlier priority date. Disclosure Document Program The Disclosure Document Program (DDP) was a USPTO program that allowed an inventor to file a preliminary description of his/her invention. The program was discontinued by the USPTO as of February 1, 2007, in favor of filing a provisional application. The USPTO says: A provisional application for patent provides more benefits and protections to inventors than a disclosure document and can be used for the same purposes as a disclosure document if necessary. ... A non-provisional application must be filed within twelve months of the filing date of a provisional patent in order for the inventor to claim the benefit of the provisional application. ... ==References==
Source: Wikipedia ↗
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