`Patent 8,391,298
`UNITED STATES PATENT AND TRADEMARK OFFICE
`_________________
`BEFORE THE PATENT TRIAL AND APPEAL BOARD
`__________________
`RINGCENTRAL, INC.,
`
`Petitioner,
`v.
`ESTECH SYSTEMS, INC.,
`
`Patent Owner
`__________________
`Inter Partes Review No. IPR2021-00574
`Patent No. 8,391,298
`
`ESTECH SYSTEMS, INC.’S
`POWER OF ATTORNEY
`
`
`
`IPR2021-00574
`Patent No. 8,391,298
`
`Estech Systems, Inc. hereby appoints the following attorneys to represent
`
`Patent Owner in the above-captioned inter partes review proceeding and to transact
`
`all business in the Patent Trial and Appeal Board of the U.S. Patent and Trademark
`
`Office connected therewith:
`
`Lead Counsel:
`
`Backup Counsel:
`
`Additional Backup
`Counsel:
`
`Todd E. Landis
`WILLIAMS SIMONS & LANDIS PLLC
`2633 McKinney Ave., Suite 130
`Dallas, TX 75204
`Tel: (512) 543-1357
`Fax: (512) 793-9575
`tlandis@wsltrial.com;
`estechcounsel@wsltrial.com
`USPTO Registration No. 44,200
`
`John Wittenzellner
`WILLIAMS SIMONS & LANDIS PLLC
`1735 Market Street, Suite A #453
`Philadelphia, PA 19103
`Tel: (512) 543-1373
`Fax: (512) 793-9575
`johnw@wsltrial.com
`USPTO Registration No. 61,662
`
`C. Matthew Rozier
`WILLIAMS SIMONS & LANDIS PLLC
`1550 Larimer Street, Suite 1067
`Denver, CO 80202
`Tel: (512) 717-6583
`Fax: (512) 793-9575
`mrozier@wsltrial.com
`USPTO Registration No. 63,429
`
`2
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`
`
`IPR2021-00574
`Patent No. 8,391,298
`
`Please recognize the following correspondence address (including the
`
`identified electronic email addresses) for Patent Owner in this proceeding:
`
`WILLIAMS SIMONS & LANDIS PLLC
`327 Congress Avenue, Suite 490, Austin, TX 78701
`Tel.: (512) 543-1354 | Fax: (512) 793-9575
`Todd E. Landis – tlandis@wsltrial.com
`John Wittenzellner – johnw@wsltrial.com
`C. Matthew Rozier – mrozier@wsltrial.com
`iprestechcounsel@wsltrial.com
`
`The individual signing below has the authority to execute this document on
`
`behalf of Patent Owner.
`
`Executed on March 26, 2021
`
`
`
`By: /Karen Boyd/
`Karen Boyd
`Title: General Counsel, Estech Systems, Inc.
`Patent Owner
`Estech Systems, Inc.
`
`3
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`
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`IPR2021-00574
`Patent No. 8,391,298
`
`CERTIFICATE OF SERVICE
`Pursuant to 37 C.F.R. § 42.6, the undersigned certifies that on March 26, 2021,
`
`the foregoing document was served on counsel of record for Petitioner by filing this
`
`document through the End-to-End System, as well as via electronic mail to counsel
`
`of record for Petitioner at the following addresses:
`
`K. Patrick Herman (P52PTABDocket@orrick.com)
`Alyssa Caridis (A8CPTABDocket@orrick.com)
`Clem Roberts (croberts@orrick.com)
`Robert L. Uriarte (ruriarte@orrick.com)
`Li Shen (lshen@orrick.com)
`
`Respectfully submitted,
`
`By: /Todd E. Landis/
`Todd E. Landis
`Registration No. 44,200
`Counsel for Patent Owner
`Estech Systems, Inc.
`
`4
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