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on 9/12/18A provisional patent can "protect" your idea in the sense that it saves the date with the patent office, until you file the non-provisional patent application. The key is that you must file the non-provisional before the provisional expires for the provisional to continue to "protect" you. Read over this in depth article on how it works: https://www.thoughtstopaper.com/blog/understanding-provisional-patent-applications/
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