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In reference to the patent: US8227460

US 2836615 is for a method for removing methylene blue from monomers Col.1 line 35 "Methylene blue is known to be a ueeful polymerization inhibitor for acrylic monomers." Col.1 line 35 "Methylene blue is known to be a useful polymerization inhibitor for acrylic monomers."

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Claim 1 of that patent is -

  1. A composition consisting essentially of: a polymerizable compound having two or more conjugated unsaturated groups and comprising a core having 2 to 10 chains, said conjugated unsaturated groups being attached to any of the last 20 atoms of the chains; and methylene blue in a concentration of 10 to 5000 ppm to prevent premature polymerization of the polymerizable compound.

It is a claim for a composition, not a method. The specification your quoted from explains the invention, the claims define what is actually protected. The other claims are dependent claims that further narrow claim 1.

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  • US2836615 is a method for removing methylene blue and US8227460 is a compound which employs methylene blue. I can't see why the first reads on the second.
    – Eric S
    Commented Mar 13, 2018 at 19:13

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