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Should Salesforce's Tableau Be Granted a Patent On 'Visualizing Hierarchical Data'?
(yro.slashdot.org)
This is a most excellent place for technology news and articles.
https://legalclarity.org/can-you-patent-something-that-already-exists/
So, you want 35 U.S.C. § 102, which says:
(emphasis mine).
What you posted states the opposite :) I agree with you, though---prior art means you can't patent it. The person I'm responding to believes otherwise.