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US Patents

.gamma.-Fe.sub.2 O.sub.3 /Fe.sub.3 O.sub.4 spinels

Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing

Patent

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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

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Manufacturing base and used to stop/slow down rivals

Serves only patent trolls

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