`
`BEFORE THE PATENT TRIAL AND APPEAL BOARD
`
`RINGCENTRAL, INC.
`
`Petitioner
`
`v.
`
`ESTECH SYSTEMS, INC.
`
`Patent Owner
`
`Case No.: IPR2021-00574
`U.S. Patent No. 8,391,298
`Issue Date: March 5, 2013
`Title: Phone Directory In A Voice Over IP Telephone System
`
`Petitioner RingCentral, Inc.'s Power of Attorney
`
`Pursuant to 37 C.F.R. § 42.10(b)
`
`
`
`Pursuant to 37 C.F.R. § 42.10(b), Petitioner RingCentral, Inc. hereby appoints
`
`the following lead and back-up counsel to transact all business before the Patent
`
`Trial & Appeal Board of the United States Patent and Trademark Office in
`
`connection with a Petition for Inter Partes Review of U.S. Patent No. 8,391,298,
`
`entitled "Phone Directory In A Voice Over IP Telephone System."
`
`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
`T: (212) 506-3596
`F: (212) 506-5151
`
`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
`T: 213-629-2020; F: 213-612-2499
`
`Clem Roberts
`Pro Hac Vice to be submitted
`CA Bar No. 209203
`(croberts@orrick.com)
`
`Postal & Hand-Delivery Address:
`Orrick, Herrington & Sutcliffe LLP
`405 Howard Street
`San Francisco, CA 94105
`
`Robert L. Uriarte
`Pro Hac Vice to be submitted
`CA Bar No. 258274
`(ruriarte@orrick.com)
`
`1
`
`
`
`Lead Counsel
`
`Backup Counsel
`
`Li Shen
`Pro Hac Vice to be submitted
`CA Bar No. 307896
`(lshen@orrick.com)
`
`Postal & Hand-Delivery Address:
`Orrick, Herrington & Sutcliffe LLP
`1000 Marsh Road
`Menlo Park, CA 94025-1015
`T: (650) 614-7400
`F: (650) 614-7401
`
`The undersigned is authorized to sign this Power of Attorney on behalf of
`
`Petitioner RingCentral, Inc.
`
`Date: 2( 5 /2')2-
`
`By:
`
`Name: Doug Chartier
`
`Title:
`
`2
`
`Assistant Vice President, Legal
`
`