`__________________
`
`BEFORE THE PATENT TRIAL AND APPEAL BOARD
`__________________________________________________________________
`
`RINGCENTRAL, INC.,
`Petitioner
`v.
`ESTECH SYSTEMS, INC.,
`Patent Owner
`
`Case IPR2021-00574
`
`US Patent No. 8,391,298
`__________________________________________________________________
`
`PETITIONER’S UPDATED MANDATORY NOTICES
`__________________________________________________________________
`
`
`
`Petitioner RingCentral, Inc. hereby makes the following updates to its
`
`Mandatory Notices.
`
`Notice of Counsel and Service Information
`Petitioners designate the following counsel and service information:
`
`Lead Counsel
`
`Backup Counsel
`
`K. Patrick Herman
`Registration No. 75,018
`(P52PTABDocket@orrick.com)
`Postal & Hand-Delivery Address:
`Orrick, Herrington & Sutcliffe LLP
`51 West 52nd Street
`New York, NY 10019
`
`Alyssa Caridis
`Registration No. 57,545
`(A8CPTABDocket@orrick.com)
`Postal & Hand-Delivery Address:
`Orrick, Herrington & Sutcliffe LLP
`777 South Figueroa Street, Suite 3200
`Los Angeles, CA 90017-5855
`
`Christopher J. Higgins
`Registration No. 66,422
`(OCHPTABDocket@orrick.com)
`Postal & Hand-Delivery Address:
`Orrick, Herrington & Sutcliffe LLP
`1152 15th St NW
`Washington, DC 20005
`
`Petitioner consents to service by electronic email at P52PTABDocket@
`
`orrick.com, A8CPTABDocket@orrick.com, OCHPTABDocket@orrick.com.
`
`-1-
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`
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`Dated: May 25, 2022
`
`Respectfully submitted,
`
`ORRICK, HERRINGTON & SUTCLIFFE LLP
`
` / K. Patrick Herman /
`K. Patrick Herman, Reg. No. 75,018
`Orrick, Herrington & Sutcliffe LLP
`51 West 52nd Street
`New York, NY 10019
`T: 212-506-3596; F: 212-506-5151
`Email: P52PTABDocket@orrick.com
`
`Attorney for Petitioner RingCentral, Inc.
`
`-2-
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`
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`CERTIFICATE OF SERVICE
`
`The undersigned hereby confirms that the foregoing paper was caused to be
`
`served on May 25, 2022 via email upon the following counsel of record for Patent
`
`Owner:
`
`Todd E. Landis
`WILLIAMS SIMONS & LANDIS PLLC
`2633 McKinney Avenue, Suite 130
`Dallas, TX 75204
`
`John Wittenzellner
`WILLIAMS SIMONS & LANDIS PLLC
`1735 Market Street, Suite A #453
`Philadelphia, PA 19103
`
`tlandis@wsltrial.com
`usccounsel@wsltrial.com
`
`johnw@wsltrial.com
`
`/K. Patrick Herman/
`K. Patrick Herman, Reg. No. 75,018
`Orrick, Herrington & Sutcliffe LLP
`51 West 52nd Street
`New York, NY 10019
`T: 212-506-3596; F: 212-506-5151
`Email: P52PTABDocket@orrick.com
`
`-3-
`
`