Cytek Biosciences, Inc. vs. Beckman Coulter, Inc. et al.

Explore the PTAB proceeding PGR2025-00084 filed by Cytek Biosciences, Inc. on 2025-09-15. This includes filing dates, application numbers, tech centers, patent numbers, and current case status.

Proceeding Overview

Proceeding Number

PGR2025-00084

Filing Date

2025-09-15

Accorded Filing Date

2025-09-15

Institution Decision Date

2026-03-17

Last Modified Date

2026-04-17

Proceeding Type

PGR

Termination Date

2026-03-17

Trial Status

Institution Denied

Parties & Counsel

Petitioner

Cytek Biosciences, Inc.

Represented By

Knight, Dustinet al

Patent Owner / Respondent

Beckman Coulter, Inc. et al.

Represented By

Cohen, Alexiset al

Tribunal & Venue

Tribunal

Patent Trial and Appeal Board (USPTO)

Technology Center

TC 2800 - Semiconductors, Electrical & Optical Systems

Patent Information

1 Patent Involved

Respondent Application Number 17645727

Respondent Patent Number 12174106

External Links

Espacenet

Google Patents

Respondent Inventor Yong Qin Chen

Respondent Tech Center TC 2800 - Semiconductors, Electrical & Optical Systems

Address and Attorney/Agent Information

14 Registered Practitioners

Power of Attorney & Correspondence

Firm / Entity Name NORTON ROSE FULBRIGHT US LLP - BCI

Customer Number 129381

Address 98 San Jacinto Blvd., Suite 1100, Austin, TX, 78701, UNITED STATES

Attorney / Agent Information

Reg #	Name	Phone
36675	Karen Shannon	312-405-0186
38159	Mony Ghose	201-847-6802
41333	Michael Stimson	210-286-6968
42203	Rutherford Viguet	214-855-8185
44699	Mark Garrett	512-474-5201
45104	Gina Shishima	512-536-3081
53429	Hema Pande	714-773-7606
54327	Anne Murphy	952-368-2048
58288	Michael Bell	714-488-7119
59891	Garrett Barten	516-241-5915
61650	Daniel Keys	949-551-1066
64961	William Wong	949-878-2481
68987	Uyen Tang	714-961-4310
72871	Michael Pohl	512-536-3113

Proceeding Documents

154

Notice: refund approved NOTICE

2026-03-27 FILING PARTY: BOARD

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Petitioner's Request for Refund of Post Institution Fees OTHER

2026-03-25 FILING PARTY: PETITIONER

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Institution Decision: Deny DECISION

2026-03-17 FILING PARTY: BOARD

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Petitioner's Pre-Institution Supplemental Reply OTHER

2026-03-06 FILING PARTY: PETITIONER

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Petitioner Updated Exhibit List NOTICE

2026-03-06 FILING PARTY: PETITIONER

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Cytek Biosciences, Inc. vs. Beckman Coulter, Inc. et al.

Proceeding Overview

Parties & Counsel

Petitioner

Cytek Biosciences, Inc.

Represented By

Patent Owner / Respondent

Beckman Coulter, Inc. et al.

Represented By

Tribunal & Venue

Patent Information

Address and Attorney/Agent Information

Power of Attorney & Correspondence

Attorney / Agent Information

Proceeding Documents

Notice: refund approved NOTICE

Petitioner's Request for Refund of Post Institution Fees OTHER

Institution Decision: Deny DECISION

Petitioner's Pre-Institution Supplemental Reply OTHER

Petitioner Updated Exhibit List NOTICE

Notice of Service filed in Beckman Coulter v. Cytek, C.A. No. 24-945 (D. Del. Oct. 1, 2025) DI 181 Exhibit

Plaintiff Beckman Coulter’s Second Election of Asserted Claims, served in Beckman Coulter v. Cytek, C.A. No. 24-945 (D. Del. Oct. 1, 2025) Exhibit

Order filed in Beckman Coulter v. Cytek, C.A. No. 24-945 (D. Del. Feb. 24, 2026) DI 226 Exhibit

Amended Joint Claim Construction Chart including Exhibit A Parties Agreed Constructions filed in Beckman Coulter v. Cytek, C.A. No. 24-945 (D. Del. Aug. 1, 2025) DI 131 Exhibit

Excerpts from Rebuttal Expert Report of Fedor A. Ilkov, Ph.D. Exhibit

Excerpts from Rebuttal Expert Report of James F. Leary, Ph.D. Exhibit

Defendant Cytek Bioscience’s Proposed Claim Constructions Exhibit

Excerpts from Transcript of James Leary, Ph.D. Exhibit

Excerpts from Transcript of Fedor Ilkov, Ph.D. Exhibit

Patent Owner's Pre-Institution Supplemental Response OTHER

Email Correspondence Exhibit

Patent Owner's Updated Power of Attorney NOTICE

Patent Owner's Updated Mandatory Notices NOTICE

Patent Owner's Motion for Withdrawal of Counsel MOTION

Ex. 3103 - Email correspondence Exhibit

Director Discretionary Decision: Refer RESPONSE

Petitioner's Updated Exhibit List NOTICE

Petitioner's Reply ISO Motion to Seal & Request for In Camera Review & Entry of Appropriate Protective Order REPLY

Memorandum from John A Squires, Under Secretary of Commerce for Intellectual Property and Director of the United States Patent and Trademark Office re Voluntary Search Disclosure Declarations as a Favorable Factor in Institution Decisions, dated November 17, 2025 Exhibit

BD LSRFortessa Cell Analyzer User’s Guide Exhibit

Patent Owner's Updated Exhibit List NOTICE

Petitioner's Sur-Reply to PO's Reply ISO Request for Discretionary Denial OTHER

Ex. 3102 Email correspondence Exhibit

PATENT OWNER'S REPLY TO PETITIONER'S OPPOSITION OF DISCRETIONARY DENIAL OTHER

Email Correspondence Exhibit

Patent Owner’s Opposition to PT MTS & Request for In Camera Review OPPOSITION

December 12, 2025 Email from A. Cohen to R. Chen Exhibit

December 18, 2025 Email from A. Cohen to Director Squires Exhibit

December 8, 2025 Email from R. Chen to A. Cohen Exhibit

December 16, 2025 Email from A. Cohen to R. Chen Exhibit

December 4, 2025 Email from A. Cohen to D. Knight Exhibit

Saleh, Fundamentals of Photonics 2d. Ed. 2007 Exhibit

Zhou 2008 Exhibit

Petitioner's Opposition to PO's Request for Discretionary Denial RESPONSE

Petitioner's Updated Power of Attorney NOTICE

Telecomm Standardization Sector of ITU, Recommendation G.694.1 (June 2002) Exhibit

Welford, Optics (3d ed. 1990) Exhibit

Azadeh, Fiber Optics Engineering (2009) Exhibit

Smith, Modern Optical Engineering (3d ed. 2000) Exhibit

Cytek Biosciences Debuts New Advanced Flow Cytometry System, (June 7, 2017), https://cytekbio.com/blogs/news/cytek-biosciences-debuts-newadvanced-flow-cytometry-system Exhibit

Telecomm Standardization Sector of ITU, Recommendation G.694.2 (Dec. 2003) Exhibit

Specification of U.S. Patent Application No. 61/653,328 Exhibit

Specification of U.S. Patent Application No. 61/911,859 Exhibit

Shapiro, Practical Flow Cytometry (2003) – Part 1 Exhibit

Nebeling, Fiber Network Engineering (July 3, 2002) Exhibit

Transcript of Markman Hearing of September 17, 2025 Exhibit

Shapiro, Practical Flow Cytometry (2003) – Part 2 Exhibit

Petitioner's Updated Mandatory Notice re Lead and Backup Counsel NOTICE

File History for U.S. Patent No. 10,330,582 Exhibit

Petitioner's Updated Exhibit List NOTICE

Declaration of David Schaafsma, Ph.D. Exhibit

Arumugam, 57 Pramana J. Physics 849 (2001) Exhibit

Patent Owner's Preliminary Response POPR

Certificate of Service of Redacted Paper #7 - Search Disclosure Declaration OTHER

Redacted Paper #7 - Search Disclosure Declaration for US Pat. No. 12,174,106 B2 OTHER

Petitioner's Updated Exhibit List NOTICE

Excerpts of the Prosecution history of U.S. Patent No. 9,746,412 Exhibit

Petitioner's Motion to Seal & Request for In Camera Review MOTION

Chen, U.S. Patent No. 10,330,582 Exhibit

Beckman Coulter Patents Exhibit