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`IN THE UNITED STATES DISTRICT COURT
`FOR THE DISTRICT OF DELAWARE
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`DAIICHI SANKYO, INC., DAIICHI SANKYO
`COMPANY, LIMITED, and ASTRAZENECA
`PHARMACEUTICALS LP
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`Plaintiffs,
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`v.
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`SEAGEN INC.,
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`Defendant.
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`C. A. No. 20-1524-LPS
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`PLAINTIFFS’ NOTICE OF POST-GRANT REVIEW PETITION
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`Plaintiffs Daiichi Sankyo, Inc. (“Daiichi Sankyo US”), Daiichi Sankyo Company, Limited
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`(“Daiichi Sankyo Japan”), and AstraZeneca Pharmaceuticals, LP (“AstraZeneca US”) notify the
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`Court that on December 23, 2020, Daiichi Sankyo US and AstraZeneca US filed a Petition for
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`Post-Grant Review seeking cancelation of Claims 1–5, 9, and 10 of Defendant Seagen Inc.’s U.S.
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`Patent No. 10,808,039, the sole patent at issue in this declaratory judgment action. While Daiichi
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`Sankyo Japan is not a party to the Petition, Daiichi Sankyo Japan is a real party-in-interest to the
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`Petition. Daiichi Sankyo US is a Delaware corporation and subsidiary of Daiichi Sankyo Japan.
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`It is the only company licensed by the United States Food and Drug Administration to sell
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`Enhertu®, the product at issue in this action. AstraZeneca US co-markets the drug with Daiichi
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`Sankyo US. A decision on institution is expected by early July 2021.
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`{01648468;v1 }
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`Case 1:20-cv-01524-LPS Document 14 Filed 12/28/20 Page 2 of 2 PageID #: 360
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`ASHBY & GEDDES
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`/s/ Steven J. Balick
`Steven J. Balick (#2114)
`Andrew C. Mayo (#5207)
`500 Delaware Avenue, 8th Floor
`P.O. Box 1150
`Wilmington, DE 19899
`(302) 654-1888
`sbalick@ashbygeddes.com
`amayo@ashbygeddes.com
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`Attorneys for Plaintiffs Daiichi Sankyo, Inc.
`and Daiichi Sankyo Company, Limited
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`MCCARTER & ENGLISH, LLP
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`/s/ Daniel M. Silver
`Michael P. Kelly (# 2295)
`Daniel M. Silver (#4758)
`Renaissance Centre
`405 N. King Street, 8th Floor
`Wilmington, Delaware 19801
`Tel.: (302) 984-6300
`Fax: (302) 984-6399
`mkelly@mccarter.com
`dsilver@mccarter.com
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`Attorneys for Plaintiff AstraZeneca
`Pharmaceuticals LP
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`Of Counsel:
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`Preston K. Ratliff II
`Joseph M. O’Malley, Jr.
`Ashley N. Mays-Williams
`Paul Hastings LLP
`200 Park Avenue
`New York, NY 10166
`(212) 318-6000
`
`Naveen Modi
`Michael A. Stramiello
`Paul Hastings LLP
`2050 M Street NW
`Washington, D.C. 20036
`(202) 551-1700
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`Of Counsel:
`
`David I. Berl
`Thomas S. Fletcher
`Williams & Connolly LLP
`725 Twelfth St. NW
`Washington, DC 20005
`(202) 434-5000
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`Dated: December 28, 2020
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`{01648468;v1 }
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