You can't apply for a patent after you put it on the market. If it is known to the public, it will lead to the loss of novelty of the patent.
Process: It is best to find an agency to apply.
Write a formal application document-submit it to the Patent Office-and issue an acceptance notice on the same day.
Awaiting approval. (About 3 years after the invention, the utility model is about 1 year, and the appearance is about 1 year.)
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