Editing Reduction to practice (section)

== 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:

<blockquote>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. ...<ref>[http://www.uspto.gov/web/offices/pac/disdo.html  USPTO Website]</ref></blockquote>