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US Patents

2,5-Dioxo-3H,6H-furo[(3,2-b]furan-3a,6a-diacetic acid and salts

Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal

Patent

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How useful is this invention? - Does humanity need patent for this invention?

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Copied from somewhere

Already used for thousands of years

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Bloory idea and bloory practical use

Very broad patent, without practical use

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Patented to preserve knowledge

Defensive patent

I am not sure

Manufacturing base and used to stop/slow down rivals

Serves only patent trolls

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