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Possible to file for a patent, despite super broad, expired patent already existing?

If you found out through the file history review + prior art search that perhaps elements A+B+C were unpatentable because they were too broad, and that your idea includes element D, then you can patent … Your question is too broad to answer in detail, so you'll have to do the legwork yourself and come to a reasonable conclusion if its worth your time to even pursue such a patent. …
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