KATY, Texas, Sept. 16, 2019 /PRNewswire/ -- U.S. Silica
Holdings, Inc. (NYSE: SLCA) announced today that its SandBox
LogisticsTM business unit intends to appeal a recent
United States Patent Office decision to invalidate challenged
claims in one of the patents at issue in SandBox's lawsuit against
Proppant Express Investments, LLC (PropX), joining other pending
appeals filed by both parties in the on-going dispute between
SandBox and PropX.
''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 Bryan Shinn, U.S.
Silica president and chief executive officer. "SandBox maintains a
robust portfolio of more than fifty issued U.S. patents
encompassing hundreds of claims. We will continue to vigorously
defend our intellectual property portfolio,'' he added.
About U.S. Silica
U.S. Silica Holdings, Inc. is a performance materials
company and is a member of the Russell 2000. The Company is a
leading producer of commercial silica used in the oil and gas
industry, and in a wide range of industrial applications. Over its
119-year history, U.S. Silica has developed core
competencies in mining, processing, logistics and materials science
that enable it to produce and cost-effectively deliver over 1,500
diversified products to customers across our end markets. U.S.
Silica's wholly-owned subsidiaries include EP Minerals and SandBox
LogisticsTM. EP Minerals is an industry leader in the
production of products derived from diatomaceous earth, perlite,
engineered clays, and non-activated clays. SandBox
LogisticsTM is a state-of-the-art leader in proppant
storage, handling and well-site delivery, dedicated to making
proppant logistics cleaner, safer and more efficient. The Company
currently operates over 25 mines and production facilities. The
Company is headquartered in Katy, Texas and has offices in Reno, Nevada and Chicago, Illinois.
U.S. Silica Holdings, Inc.
Michael Lawson
Vice President of Investor Relations and Corporate
Communications
(301) 682-0304
lawsonm@ussilica.com
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SOURCE U.S. Silica Holdings, Inc.