U.S. Silica's SandBox Unit To Appeal Patent Office Decision
''We have been pleased with the Patent Office's decisions upholding multiple claims across three of four patents challenged by PropX in other IPRs that have reached a final decision. It's important to note that in the underlying case against PropX, we only need to establish infringement of one claim and several of the claims in suit have been upheld in IPRs. Although we believe this latest decision was wrong, our success rate in these IPRs is well above the statistical norm and positions us very well in the litigation," said
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Vice President of Investor Relations and Corporate Communications
(301) 682-0304
lawsonm@ussilica.com
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