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 ...
DENVER, May 20, 2020 (GLOBE NEWSWIRE) -- Proppant Express Investments, LLC (“PropX” or the “Company”), a leader in providing last-mile sand logistics to the energy industry, today announced that the ...
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