Do they examine provisional patent applications?

niksag_3000 asked:

If I file a provisional patent application and then use the 12 months to see how to make,sell and market this product, will it be protected? How would I know if it does not exist? I know when you file the non provisional application you also pay for the examination process before they grant you a patent.

Tell me what I should consider when filing a provisional patent application.


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