KATY, Texas, March 14, 2019 /PRNewswire/ -- U.S. Silica
Holdings, Inc. (NYSE: SLCA) announced today that the United States
Patent and Trademark Office has confirmed several additional patent
claims covering fundamental aspects of technology owned by its
SandBox Logistics™ business unit, continuing to
validate the strength of the SandBox patent portfolio. These wins
mean that Proppant Express Investments, LLC (PropX) is judicially
barred from making the same or similar invalidity arguments in any
future infringement proceedings involving these patents.
"We are very pleased that the SandBox patent portfolio continues
to hold up so well against challenges from PropX,'' said
Bryan Shinn, U.S. Silica president
and chief executive officer. ''We've now seen the Patent Office
uphold key claims in three of the four IPRs initiated by PropX,
including claims central to our underlying infringement action
against PropX. Our success rate in these IPRs is well above the
statistical norm and positions us extremely well in our ongoing
action against PropX,'' 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
Logistics™. EP Minerals is an industry leader in the
production of products derived from diatomaceous earth, perlite,
engineered clays, and non-activated clays. SandBox
Logistics™ 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 27 production facilities. The Company is
headquartered in Katy, Texas
and has offices in Frederick,
Maryland, 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
Nick Shaver
Investor Relations Manager
281-394-9630
shavern@ussilica.com
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SOURCE U.S. Silica Holdings, Inc.