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What is the difference between a provisional and a non-provisional patent application?

The Detailed Description of this patent application begins with the sentence: This is a non-provisional application based upon U.S. provisional patent application Ser. No. 61/451,429, entitled ...
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Status of US 2012/0228338

Is this Patent Registered or just applied — US 2012/0228338 Vented spout There is no Invention in it. There are already many such products in market, but this guy is claiming to be the ...