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September 16, 2019 07:25 ET | Source: Proppant Express Investments, LLC

Proppant Express Investments Prevails in Patent Trial and Appeal Board Ruling Resulting in Invalidation of SandBox Logistics Patent Claims

DENVER, Sept. 16, 2019 (GLOBE NEWSWIRE) -- Proppant Express Investments, LLC (PropX) today announced that the United States Patent and Trademark Office (USPTO) through the Patent Trial and Appeal...