KATY, Texas, Feb. 15, 2019 /PRNewswire/ -- U.S. Silica
Holdings, Inc. (NYSE: SLCA) announced today that the United States
Patent Office has confirmed two key claims of a patent which covers
fundamental aspects of technology
owned by its SandBox Logistics™ business unit. This
win marks the second IPR victory for SandBox, the first coming when
the Patent Office rejected all of Proppant Express' (PropX)
challenges to a different SandBox patent. PropX is now
judicially estopped from making the same or similar arguments again
in any future infringement proceedings involving this
patent.
![U.S. Silica (PRNewsFoto/U.S. Silica) U.S. Silica (PRNewsFoto/U.S. Silica)](https://mma.prnewswire.com/media/212300/us_silica_logo.jpg)
"We are very pleased that the Patent Office has once again
confirmed key claims in our patent portfolio,'' said Bryan Shinn, U.S. Silica president and chief
executive officer. ''The SandBox portfolio has stood up very well
in the IPR process, an especially challenging venue for patent
holders. Our successes, including a complete victory against an
earlier IPR filed by PropX, validate our belief that we have
important and valid intellectual property, which we will continue
to vigorously enforce," he concluded.
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.