I wonder if this is what they did. The patent office has a $10 Document Disclosure plan available. You merely sent in two copies of the description and sketches of your latest invention idea. The patent office stamps a number on both sets, returns one set to you and keeps the other for exactly for two years. After two years they toss it. If you file for a patent within the two years, you can refer to that document in any patent application you make. The idea was you can establish an officially recognized conception date for the invention when you do file your patent.
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