Duke Manufacturing Co. vs. Marmon Foodservice Technologies, Inc.

Explore the PTAB proceeding IPR2026-00406 filed by Duke Manufacturing Co. on 2026-07-02. This includes filing dates, application numbers, tech centers, patent numbers, and current case status.

Proceeding Overview

Proceeding Number

IPR2026-00406

Filing Date

2026-07-02

Accorded Filing Date

2026-07-02

Institution Decision Date

—

Last Modified Date

2026-10-15

Proceeding Type

IPR

Termination Date

—

Trial Status

Pending

Parties & Counsel

Petitioner

Duke Manufacturing Co.

Represented By

Everding, Williamet al

Patent Owner / Respondent

Marmon Foodservice Technologies, Inc.

Represented By

Liro, Christopheret al

Tribunal & Venue

Tribunal

Patent Trial and Appeal Board (USPTO)

Technology Center

TC 3700 - Mechanical Engineering & Manufacturing

Patent Information

1 Patent Involved

Respondent Application Number 16403349

Respondent Patent Number 10852002

External Links

Espacenet

Google Patents

Respondent Inventor Kyle Thomas Kestner et al

Respondent Tech Center TC 3700 - Mechanical Engineering & Manufacturing

Address and Attorney/Agent Information

15 Registered Practitioners

Power of Attorney & Correspondence

Firm / Entity Name ANDRUS INTELLECTUAL PROPERTY LAW, LLP

Customer Number 26753

Address 790 NORTH WATER STREET, SUITE 2200, MILWAUKEE, WI, 53202, UNITED STATES

Attorney / Agent Information

Reg #	Name	Phone
36057	Edward Williams Jr	414-271-7590
40689	Joseph Kuborn	414-271-7590
54180	Peter Holsen	414-271-7590
54853	Aaron Olejniczak	414-271-7590
59016	Donald O'Brien	414-271-7590
60036	Benjamin Imhoff	414-271-7590
68635	Ryann Beck	414-271-7590
69966	Emily Chilson	414-271-7590
70129	Dillon Durnford	414-277-5613
70399	Christopher Liro	414-271-7590
73778	Kevin Spexarth	414-271-5770
75281	Thomas Knight	414-271-7590
76555	Daniel Ochoa	414-271-7590
78928	Melissa Kleine	414-270-7590
83242	John Dyro Jr.	414-223-3787

Proceeding Documents

107

Patent Owner's Reply In Support of Discretionary Denial OTHER

2026-10-15 FILING PARTY: PATENT OWNER

Download

3102

Email Correspondence Exhibit

2026-10-13 FILING PARTY: BOARD

Download

2012

BRYAN, Frank, “Hazard Analysis Critical Control Point (HACCP) Systems for Retail Food and Restaurant Operations” (1990) Exhibit

2026-10-06 FILING PARTY: PATENT OWNER

Download

2022

REDACTED Burger King Extended Holding Proposal Exhibit

2026-10-06 FILING PARTY: PATENT OWNER

Download

2018

International Standard ISO 11037: Sensory Analysis – Guidelines for Sensory Assessment of the Colour of Products Exhibit

2026-10-06 FILING PARTY: PATENT OWNER

Download

Duke Manufacturing Co. vs. Marmon Foodservice Technologies, Inc.

Proceeding Overview

Parties & Counsel

Petitioner

Duke Manufacturing Co.

Represented By

Patent Owner / Respondent

Marmon Foodservice Technologies, Inc.

Represented By

Tribunal & Venue

Patent Information

Address and Attorney/Agent Information

Power of Attorney & Correspondence

Attorney / Agent Information

Proceeding Documents

Patent Owner's Reply In Support of Discretionary Denial OTHER

Email Correspondence Exhibit

BRYAN, Frank, “Hazard Analysis Critical Control Point (HACCP) Systems for Retail Food and Restaurant Operations” (1990) Exhibit

REDACTED Burger King Extended Holding Proposal Exhibit

International Standard ISO 11037: Sensory Analysis – Guidelines for Sensory Assessment of the Colour of Products Exhibit

Duke Heatsink Product Holding Units Sell Sheet Exhibit

U.S. Patent No. 7,105,779 Exhibit

Patent Owner's Motion to Seal MOTION

REDACTED Email re: Draft PHU Approval (2015-01-30) Exhibit

Curriculum Vitae of Dr. Timothy J. Bowser Exhibit

ASTM International Standard Test Method for Performance of Hot Food Holding Cabinets Exhibit

REDACTED Email Chain re: Manual (2015-05-12) Exhibit

REDACTED Burger King Next Gen Food Holding Exhibit

Declaration of Kyle Kestner Exhibit

HOLST, Meghan M. et al. “Environmental Antecedents of Foodborne Illness Outbreaks, United States, 2017–2019” (2024) Exhibit

U.S. Patent No. 7,227,102 Exhibit

REDACTED Prince Castle Gen. II PHU Teardown Report by Jack McCluskey (2015-07-15) Exhibit

Fortmann’197 File History Exhibit

Petitioner's Second Motion to Seal MOTION

Sotera Stipulation Exhibit

DHB3PT-33DD Manual Exhibit

Flame Magazine Exhibit

Marmon Preliminary Infringement Contentions Exhibit

REDACTED Email re: Prince Castle 2nd Gen Bin Install (2015-04-21) Exhibit

U.S. Patent No. 6,175,099 Exhibit

REDACTED Email Chaine re: New PHU (2015-04-22) Exhibit

ASTM International Standard Test Method for Performance of Cook-and-Hold Ovens (reapproved 2026) Exhibit

ASTM International Standard Specification for Hot Food Holding Tables Exhibit

LI et al., “Smart Manufacturing Standardization: Architectures, Reference Models and Standards Framework” (2018) Exhibit

SWAINSON, Mark, “Food Sector Challenges and the Role of Technical and Quality Management” (2019) Exhibit

REDACTED Email Chain re: Prince Castle New PHU (2015-04-21) Exhibit

REDACTED Prince Castle Extended Hold Sensory Test Report: Eggs and French Toast by Kyle Kestner (2015-01-09) Exhibit

Duke Infrared Product Holding Units Sell Sheet Exhibit

U.S. Department of Health and Human Services Food and Drug Administration, “Guidance for Industry – Process Validation: General Principles and Practices” (2011) Exhibit

International Standard ISO 11036: Sensory Analysis, Methodology, Texture Profile Exhibit

American Meat Science Association, “Research Guidelines for Cookery, Sensory Evaluation, and Instrumental Tenderness Measurements of Meat” (2015) Exhibit

REDACTED Prince Castle Extend Holding Bin DHB-BK24 Series Operation Manual Exhibit

REDACTED Email Chain re: Prince Castle Minder 6.01.50 Upgrade (2015-04-21) Exhibit

ASTM International Standard Specification for Slow Cook/Hold Ovens and Hot Food Holding Cabinets (reapproved 2020) Exhibit

Duke Product Holding Unit Comparison Charts Exhibit

Patent Owner's Preliminary Response POPR

U.S. Patent Application Publication No. 2014/0130684 Exhibit

ASTM International Standard Guide for Sensory Claim Substantiation (2026) Exhibit

Declaration of Dr. Timothy J. Bowser Exhibit

Minute Entry Exhibit

Petitioner's Opposition to Motion for Discretionary Denial (Redacted) RESPONSE

Case Management Order Exhibit

’750 File History Exhibit

Motion to Stay Exhibit

Declaration of Greg Hake (Redacted) Exhibit

Email Correspondence Exhibit

Docket Report, 4:25-cv-01491-ZMB (E.D. Mo.) Exhibit

Joint Proposed Scheduling Plan, 4:25-cv-01491-ZMB (E.D. Mo.)(Dkt. 45) Exhibit

Motion to Seal MOTION

Complaint, Case No. 4:25-cv-01491-ZMB (E.D. Mo.)(Dkt. 1) Exhibit

Declaration of Michael Mattingly Exhibit

PATENT OWNER’S BRIEF IN SUPPORT OF DISCRETIONARY DENIAL RESPONSE

Duke Manufacturing Co.’s Response To Marmon’s Request For An Initial Pretrial Conference, 4:25-cv-01491-ZMB (E.D. Mo.)(Dkt. 36) Exhibit

Notice of Non-Opposition to Petitioner's Motion to File Under Seal NOTICE

Notice: Mandatory Notice NOTICE

Notice: NOTICE OF FILING DATE ACCORDED TO PETITION AND TIME FOR FILING PATENT OWNER PRELIMINARY RESPONSE NOTICE

Prince Castle Holding Bins Exhibit

E-mail Collection (IRHS Manual Related) Exhibit

U.S. Patent No. 7,258,064 Exhibit

E-mail Collection (IRHS Service Manual Related) Exhibit