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A question about Patent Law?

When a patent expires after 20 years, does that invention go into the public domain? Or, can another person get a patent for the same invention?

2 Answers

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  • 1 decade ago
    Favorite Answer

    No one can obtain a new patent for the same invention. After 20 years, someone will probably already have a a patent for a significantly improved version.

  • Anonymous
    4 years ago

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