A recent US patent (Delphion version) covers a WOODEN STICK or TREE BRANCH for a dog to play with. I am not, repeat, not, making this up. More ridiculous/obscure patents.
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Stephan Kinsella is a libertarian writer and patent attorney in Houston, Texas. He has published widely on various areas of libertarian legal theory and on legal topics such as intellectual property law and international law. His publications include Legal Foundations of a Free Society (Papinian Press, 2023), Against Intellectual Property (Mises Institute, 2008), and International Investment, Political Risk, and Dispute Resolution: A Practitioner’s Guide (Oxford, 2020).
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