Merck Sharp & Dohme LLC vs. Surrozen Operating, Inc. et al.

Explore the PTAB proceeding PGR2026-00027 filed by Merck Sharp & Dohme LLC on 2026-02-12. This includes filing dates, application numbers, tech centers, patent numbers, and current case status.

Proceeding Overview

Proceeding Number

PGR2026-00027

Filing Date

2026-02-12

Accorded Filing Date

2026-02-12

Institution Decision Date

2026-07-21

Last Modified Date

2026-08-21

Proceeding Type

PGR

Termination Date

2026-07-21

Trial Status

Institution Denied

Parties & Counsel

Petitioner

Merck Sharp & Dohme LLC

Represented By

Feldstein, Market al

Patent Owner / Respondent

Surrozen Operating, Inc. et al.

Represented By

LoCascio, Gregget al

Tribunal & Venue

Tribunal

Patent Trial and Appeal Board (USPTO)

Technology Center

TC 1600 - Biotechnology & Organic Chemistry

Patent Information

1 Patent Involved

Respondent Application Number 18361782

Respondent Patent Number 12297278

External Links

Espacenet

Google Patents

Respondent Inventor Yang LI et al

Respondent Tech Center TC 1600 - Biotechnology & Organic Chemistry

Address and Attorney/Agent Information

8 Registered Practitioners

Power of Attorney & Correspondence

Firm / Entity Name Cooley LLP / Surrozen Operating, Inc.

Customer Number 157070

Address Attn: IP Docketing Department, 1299 Pennsylvania Avenue, NW, Suite 700, Washington, DC, 20004, UNITED STATES

Attorney / Agent Information

Reg #	Name	Phone
43210	Michael Tuscan	202-842-7802
45899	Christina Stock	617-937-2300
51909	Carol Laherty	206-452-8700
64911	Mark Rogel	206-452-8700
66020	Anita Melikian	1-978-670-8027
73852	Jordan Phelan	202-728-7066
81446	Ashley Sherrid	206-452-8824
81740	Tian Yong Zheng	206-452-8774

Proceeding Documents

111

Institution Decision: Deny DECISION

2026-07-21 FILING PARTY: BOARD

Download

Director Discretionary Decision: Refer RESPONSE

2026-06-23 FILING PARTY: BOARD

Download

Petitioner's Opposition to Patent Owner's Discretionary-Denial Request RESPONSE

2026-05-26 FILING PARTY: PETITIONER

Download

2024

Zhang (2023) Exhibit

2026-05-26 FILING PARTY: PATENT OWNER

Download

2031

US20080267955A1 Exhibit

2026-05-26 FILING PARTY: PATENT OWNER

Download

Merck Sharp & Dohme LLC vs. Surrozen Operating, Inc. et al.

Proceeding Overview

Parties & Counsel

Petitioner

Merck Sharp & Dohme LLC Follow

Represented By

Patent Owner / Respondent

Surrozen Operating, Inc. et al. Follow

Represented By

Tribunal & Venue

Patent Information

Address and Attorney/Agent Information

Power of Attorney & Correspondence

Attorney / Agent Information

Proceeding Documents

Institution Decision: Deny DECISION

Director Discretionary Decision: Refer RESPONSE

Petitioner's Opposition to Patent Owner's Discretionary-Denial Request RESPONSE

Zhang (2023) Exhibit

US20080267955A1 Exhibit

Patent Owner's Preliminary Response POPR

Turner (2016) Exhibit

US20130230521A1 Exhibit

Chen (2009) Exhibit

US8507442 Exhibit

Patent Owner's Updated Mandatory Notices NOTICE

Neuhaus (2021) Exhibit

US20140105917 Exhibit

US20080038272A1 Exhibit

Prof. Karl Willert C.V. Exhibit

DeBruine (2017) Exhibit

Falini (2022) Exhibit

Alrefaei (2020) Exhibit

App. No. 62607879 Exhibit

Kim (2008) Exhibit

Matoba (2017) Exhibit

Dr. Jeffrey Ravetch C.V. Exhibit

Terasaki (2002) Exhibit

Declaration of Prof. Karl Willert Exhibit

Jakobovits (2007) Exhibit

US20030044409A1 Exhibit

Patent Owner's Updated Power of Attorney NOTICE

Lu (2004) Exhibit

App. No. 62607877 Exhibit

Declaration of Dr. Jeffrey Ravetch Exhibit

Order: ORDER Granting Patent Owner’s Motions for Admission Pro Hac Vice of Jeanna Wacker and Ashley Ross 37 C.F.R. § 42.10 ORDER

Sept. 12, 2022 Office Action, No. 16-954,484 Exhibit

Biochemistry News 2003 Exhibit

Patent Owner's Unopposed Motion for Pro Hac Vice Admission of Ashley Ross MOTION

Coke Morgan Stewart Memo Exhibit

89 Fed. Reg. 1563 Exhibit

Declaration of Ashley Ross in Support of Motion for Admission Pro Hac Vice Exhibit

Patent Owner's Unopposed Motion for Pro Hac Vice Admission of Jeanna Wacker MOTION

PTAB FAQs Exhibit

Anand Desai LinkedIn Exhibit

Patent Owner's Discretionary Denial Brief RESPONSE

Declaration of Jeanna Wacker in Support of Pro Hac Vice Motion Exhibit

Xue, Wnt Signaling Pathways in Biology and Disease Exhibit

Notice: Patent Owner's Mandatory Notice NOTICE

Notice: Patent Owner's Power of Attorney NOTICE

Notice: Notice filing date accorded NOTICE

Wang 2016 Exhibit

Kumar 2014 Exhibit

12,297,278 Exhibit

Pedotti 2011 Exhibit

Bryja 2009 Exhibit

Niehrs 2012 Exhibit

Kohn 2005 Exhibit

MacDonald 2010 Exhibit

van Rosmalen 2017 Exhibit

Cuesta 2010 Exhibit

62/607,875 Exhibit

62/680,522 Exhibit

Gonzalez-Sancho 2004 Exhibit

Rao 2010 Exhibit

Dijksterhuis 2015 Exhibit

WO 2020/018445 A1 Exhibit

Kahn Declaration Exhibit

Ahmadzadeh 2014 Exhibit

de Lau 2011 Exhibit

Merck Sharp & Dohme LLC

Surrozen Operating, Inc. et al.