`
`BEFORE THE PATENT TRIAL AND APPEAL BOARD
`
`IBG LLC; INTERACTIVE BROKERS LLC; TRADESTATION GROUP, INC.;
`TRADESTATION SECURITIES, INC.; TRADESTATION TECHNOLOGIES,
`INC.; IBFX, INC.; CQG, INC.; and CQGT, LLC
`Petitioners
`
`V.
`
`TRADING TECHNOLOGIES INTERNATIONAL, INC.
`Patent Owner
`
`Patent No. 7,533,056
`
`TRADESTATION TECHNOLOGIES, INC.
`POWER OF ATTORNEY PURSUANT TO 37 C.F.R. §42.10(b)
`
`Mail Stop “PA TENT BOARD”
`Patent Trial and Appeal Board
`U.S. Patent and Trademark Office
`
`P.O. Box 1450
`
`Alexandria, VA 22313-1450
`
`
`
`U.S. Patent No. 7,533,056
`
`Pursuant to 37 C.F.R. § 42.10(b), Petitioner TradeStation Technologies, Inc.,
`
`having a principal place of business at 8050 SW 10th Street, Suite 2000,
`
`Plantation, FL 33324, hereby appoints the practitioners of Customer No. 261 ll as
`
`its attorneys to transact all business in the United States Patent & Trademark
`
`Office associated with the covered business method review of U.S. Patent No.
`
`7,533,056. These attorneys include at least:
`
`Lead Counsel:
`
`Back-up Counsel:
`
`Robert E. Sokohl (Reg. No. 36,013)
`Lori A. Gordon (Reg. No. 50,633)
`Jonathan M. Strang (Reg. No. 61,724)
`
`ph: 202.772.8677
`ph: 202.772.8862
`ph: 202.772.8893
`
`Address:
`
`STERNE, KESSLER, GOLDSTEIN & Fox P.L.L.C.
`
`1 100 New York Avenue, NW
`
`Washington, DC 20005
`
`202.371.2600 (reception)
`
`202.371.2540 (facsimile)
`
`rsokohl-PTAB@skgf.com
`
`lgordon—PTAB@sl<gf.com
`
`jstrang—PTAB@skgf.com
`
`FOR:
`
`TradeStation Technologies, Inc.
`
`SIGNATURE?"
`
`BY: