IP Library › Granted Patent US 12,478,216
Granted Patent B2
US 12,478,216 · App. 17/448,899 · Granted Nov 25, 2025

Food holding apparatus

Inventors: James W. Bigott (Fenton, MO); Benjamin Kingbay Wann (St. Louis, MO); Thomas Earl Kieffer (St. Louis, MO); Jeffrey Allen Stafford (St. Louis, MO); Alan Stolzman (Robertsville, MO)
Assignee: DUKE MANUFACTURING CO.
A47J39/006A47J36/2483F25D31/005F25D31/006
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Quick Facts
Patent No.
US 12,478,216
App. No.
17/448,899
Granted
Nov 25, 2025
Kind
B2
Abstract

A food holding apparatus and associated components and methods. The food holding apparatus includes multiple food receivers configured to be independently controlled to heat or cool food received therein. The food holding apparatus includes a refrigeration system. Components of the refrigeration system are mounted on a sled movable between stowed and access positions to facilitate access to the components. The food holding apparatus can include touch screen controls, serpentine-shaped bar heating elements, and/or other features.

Claims (34)

1 . A food holding apparatus comprising:

a housing defining an interior, the housing including an upper portion having a food receiver, the food receiver defining a cavity with an open top, the cavity being sized and shaped to receive a first tray of food when the tray of food is inserted into the cavity from the open top, the food receiver having a cooling conduit configured to receive refrigerant to cool the tray of food when the tray of food is disposed in the cavity;

a track in the interior of the housing and supported by the housing;

a support movable relative to the housing along the track between a stored position and an access position, the support being configured to be disposed in the interior of the housing when the support is in the stored position, the support being configured to be at least partially outside the interior in a cantilevered arrangement when the support is in the access position; and

a refrigeration system fluidly coupled to the cooling conduit to supply the cooling conduit with refrigerant, the refrigeration system including:

a compressor;

a condenser; and

plumbing fluidly connecting the compressor, the condenser, and the cooling conduit;

wherein at least one of the compressor or the condenser is supported by the support and is movable with the support between the stored and access positions;

wherein the housing defines an opening in communication with the interior, and wherein the support is configured to move in the opening when the support is moved from the stored position toward the access position, the opening being different from the track;

wherein the track is configured to guide movement of the support in a first direction away from the stored position toward the access position and to guide movement of the support in a second direction away from the access position toward the stored position, and the track is configured to support the support against tipping in the first direction when the support is in the access position to locate and support said at least one of compressor or the condenser for access in the access position;

wherein the compressor and the condenser are configured to be disposed in the interior when the support is in the stored position;

wherein the plumbing includes a connector, the connector configured to permit the at least one of the condenser or the compressor to move between the stored and access positions while remaining attached to the plumbing.

2 . The food holding apparatus of claim 1 , wherein at least one of the condenser or the compressor is configured to be disposed outside of the interior when the support is in the access position.

3 . The food holding apparatus of claim 2 , wherein the condenser is configured to be disposed outside of the interior when the support is in the access position.

4 . The food holding apparatus of claim 1 , wherein the compressor and the condenser are configured to be disposed outside of the interior when the support is in the access position.

5 . The food holding apparatus of claim 1 , wherein the compressor and the condenser are supported by the support and are movable with the support between the stored and access positions.

6 . The food holding apparatus of claim 1 , wherein the connector comprises a coiled flexible pipe.

7 . The food holding apparatus of claim 1 , wherein the connector is a first connector and the plumbing includes a second connector, wherein the compressor and the condenser are supported by the support and are movable with the support between the stored and access positions, and wherein the first connector is disposed between the compressor and the cooling conduit and the second connector is disposed between the condenser and the cooling conduit to permit both the condenser and compressor to move between the stored and access positions while remaining attached to the plumbing.

8 . The food holding apparatus of claim 1 , further comprising a holder arranged to engage the support when the support is in the stored position to hold the support in the stored position.

9 . The food holding apparatus of claim 8 , wherein the holder is configured to disengage from the support when the support is moved toward the access position and to engage the support when the support is moved toward the stored position.

10 . The food holding apparatus of claim 9 , wherein the track has a track axis, the support being configured to move parallel to the track axis between the stored position and the access position, the holder including an engagement surface arranged to engage the support when the support is moved toward the stored position to position the support in the stored position and to disengage the support when the support is moved toward the access position, the engagement surface being oriented at a skewed angle relative to the track axis.

11 . The food holding apparatus of claim 1 , wherein the food receiver includes a heater configured to heat the tray of food when the tray of food is disposed in the cavity.

12 . The food holding apparatus of claim 11 , further comprising a temperature controller configured to operate the refrigeration system and the heater to selectively cool or heat the food receiver.

13 . The food holding apparatus of claim 12 , wherein the food receiver is a first food receiver, the food holding apparatus further comprising a second food receiver, the second food receiver defining a cavity with an open top, the cavity of the second food receiver being sized and shaped to receive a second tray of food when the second tray of food is inserted into the cavity of the second food receiver from the open top of the second food receiver, the second food receiver having a cooling conduit configured to receive refrigerant to cool the second tray of food when the second tray of food is disposed in the cavity of the second food receiver, the second food receiver including a heater configured to heat the second tray of food when the second tray of food is disposed in the cavity of the second food receiver, the temperature controller configured to operate the refrigeration system and the heater of the second food receiver to selectively cool or heat the second food receiver independent of the first food receiver.

14 . The food holding apparatus of claim 1 , wherein the track includes a rail, the support being movable along the rail between the stored position and the access position, the support being arranged to engage the rail to inhibit the support from tipping in the first direction when the support is in the access position.

15 . The food holding apparatus of claim 14 , wherein the rail is mounted to and extends upward from a base of the housing.

16 . The food holding apparatus of claim 1 , wherein the support is in engagement with and slidable on the track as the support is moved from the stored position to the access position.

17 . The food holding apparatus of claim 1 , further comprising a holder arranged relative to the support to hold the support in the stored position, the holder including a ramp configured to frictionally engage the support as the support is moved toward the stored position.

18 . The food holding apparatus of claim 17 , wherein the ramp is configured to increase frictional force on the support as the support is moved along the ramp toward the stored position.

19 . The food holding apparatus of claim 1 , further comprising a holder arranged relative to the track to engage the support when the support is moved from the access position toward the stored position and to limit rattling of the support in the stored position by engagement of the holder with the support, the holder being arranged to disengage from the support when the support is moved away from the stored position toward the access position.

20 . The food holding apparatus of claim 1 , further comprising a first engagement surface and a second engagement surface, the first and second engagement surfaces arranged relative to the support such that the first and second engagement surfaces squeeze the support between the first and second engagement surfaces as the support is moved toward the stored position.

21 . The food holding apparatus of claim 1 , further comprising an engagement surface arranged relative to the support such that the engagement surface squeezes the support between the engagement surface and the track as the support is moved toward the stored position.

22 . The food holding apparatus of claim 1 , wherein a majority of the support is disposed outside the interior of the housing when the support is in the access position.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 16, 2022
From: BIGOTT, JAMES W.; WANN, BENJAMIN KINGBAY; KIEFFER, THOMAS EARL; STAFFORD, JEFFREY ALLEN; STOLZMAN, ALAN
To: DUKE MANUFACTURING CO.
Reel/Frame 059023/0049 →
Continuity (2)
Provisional Application 63083534 · Sep 25, 2020
Related Publication 20220095836A1 · Mar 31, 2022
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Expert Declaration of Kelly Homan Re. Invalidity of U.S. Pat. No. 8,307,761. [cited by applicant]
Expert Declaration of Kelly Homan Re. Invalidity of U.S. Pat. No. 8,661,970. [cited by applicant]
Expert Declaration of Kelly Homan Re. Invalidity of U.S. Pat. No. 9,795,253. [cited by applicant]
Expert Declaration of Kelly Homan Re. Invalidity of U.S. Pat. Nos. 8,307,761, 8,661,970, and 9,795,253. [cited by applicant]
Expert Report of Dr. J. Rhett Mayor Re. U.S. Pat. Nos. 8,307,761, 8,661,970, and 9,795,253. [cited by applicant]
Expert Report of Kelly Homan Re. the Invalidity of U.S. Pat. No. 8,307,761. [cited by applicant]
Expunged Corrected Inter Partes Review Petition Against U.S. Pat. No. 8,701,554. [cited by applicant]
Feb. 16, 2022 Deposition of Kelly Homan. [cited by applicant]
Federal Circuit Decision Reversing the Preliminary Injunction Re. U.S. Pat. Nos. 8,307,761, 8,661,970, and 9,795,253. [cited by applicant]
Final Written Decision in the IPR Re. U.S. Pat. No. 8,307,761. [cited by applicant]
Final Written Decision in the IPR Re. U.S. Pat. No. 8,661,970. [cited by applicant]
Final Written Decision in the IPR Re. U.S. Pat. No. 9,795,253. [cited by applicant]
Flexible Heaters. [cited by applicant]
Flyer 1 Complete, Bring Your Lunchroom to Life, 2002-2003, 8 Pgs. [cited by applicant]
Flyer 2 Complete, Bring Your Lunchroom to Life, 2003-2004, 8 Pgs. [cited by applicant]
Hatco Corporation, Glo-Ray Designer Merchandising Warmers, Model Nos. GR2SDH and GR2SDS, Undated, 2 Pgs. [cited by applicant]
Hatco Corporation, Glo-Ray Pizza Warmers, Model Nos. GRPWS Series, 2 Pgs. [cited by applicant]
Hatco Glo-Ray Operator's Manual (2012). [cited by applicant]
How a Silicone Heating Pad Works. [cited by applicant]
Institution Decision in the IPR Re. U.S. Pat. No. 8,307,761. [cited by applicant]
Institution Decision in the IPR Re. U.S. Pat. No. 8,661,970. [cited by applicant]
Institution Decision in the IPR Re. U.S. Pat. No. 9,795,253. [cited by applicant]
Inter Partes Review Petition Against U.S. Pat. No. 8,307,761. [cited by applicant]
Inter Partes Review Petition Against U.S. Pat. No. 8,661,970. [cited by applicant]
Inter Partes Review Petition Against U.S. Pat. No. 9,795,253. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 8,307,761 - Part 1. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 8,307,761 based on Duke Heritage Buffet. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 8,307,761 based on Finegan. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 8,307,761 based on Load King Diamond Bar. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 8,307,761 based on Richmond. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 8,307,761 based on Shackelford. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 8,661,970 based on Duke Heritage Buffet. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 8,661,970 based on Finegan. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 8,661,970 based on Load King Diamond Bar. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 8,661,970 based on Richmond. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 8,661,970 based on Shackelford. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 9,795,253 based on Duke Heritage Buffet. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 9,795,253 based on Finegan. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 9,795,253 based on Load King Diamond Bar. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 9,795,253 based on Richmond. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 9,795,253 based on Shackelford. [cited by applicant]
Invalidity Contentions for U.S. Pat. No. 8,307,761—Part 2. [cited by applicant]
Jul. 8, 2021 Deposition of Dennis Finegan. [cited by applicant]
Jun. 25, 2021 Deposition of Alvis Hartsfield. [cited by applicant]
Kitchen Equipment Fabricating Co. Answer to Counterclaim Re. Infringement of U.S. Pat. No. 8,701,554. [cited by applicant]
Low Temp Indus. Corrected Responsive Brief on Appeal Re. U.S. Pat. Nos. 8,307,761, 8,661,970, and 9,795,253. [cited by applicant]
Low Temp Indus. Preliminary Response in the IPR Re. U.S. Pat. No. 8,661,970. [cited by applicant]
Low Temp Indus. Preliminary Response in the IPR Re. U.S. Pat. No. 9,795,253. [cited by applicant]
Low Temp Indus. Preliminary Response in the IPR Re. U.S. Pat. No. 8,307,761. [cited by applicant]
Low Temp Indus. Preliminary Sur Reply in the IPR Re. U.S. Pat. No. 8,307,761. [cited by applicant]
Low Temp Indus. Preliminary Sur Reply in the IPR Re. U.S. Pat. No. 8,661,970. [cited by applicant]
Low Temp Indus. Preliminary Sur Reply in the IPR Re. U.S. Pat. No. 9,795,253. [cited by applicant]
Low Temp Indus. Response for Preliminary Injunction Re. U.S. Pat. Nos. 8,307,761, 8,661,970, and 9,795,253. [cited by applicant]
Low Temp Indus. Response in the IPR Re. U.S. Pat. No. 8,307,761. [cited by applicant]
Low Temp Indus. Response in the IPR Re. U.S. Pat. No. 8,661,970. [cited by applicant]
Low Temp Indus. Response in the IPR Re. U.S. Pat. No. 9,795,253. [cited by applicant]
Low Temp Indus. Sur Reply in the IPR Re. U.S. Pat. No. 8,307,761. [cited by applicant]
Low Temp Indus. Sur Reply in the IPR Re. U.S. Pat. No. 8,661,970. [cited by applicant]
Low Temp Indus. Sur Reply in the IPR Re. U.S. Pat. No. 9,795,253. [cited by applicant]
Low Temp. Industries Reply in Support of its Motion for Preliminary Injunction Re. U.S. Pat. Nos. 8,307,761, 8,661,970, and 9,795,253. [cited by applicant]
Mar. 23, 2021 Deposition of Kelly Homan. [cited by applicant]
Oct. 1, 2021 Deposition of Kelly Homan. [cited by applicant]
Order Granting Motion for Preliminary Injunction Re. U.S. Pat. Nos. 8,307,761, 8,661,970, and 9,795,253. [cited by applicant]
Original Inter Partes Review Petition Against U.S. Pat. No. 8,701,554. [cited by applicant]
Preliminary Injunction Hearing Transcript. [cited by applicant]
Prosecution History of U.S. Pat. No. 8,171,845. [cited by applicant]
Prosecution History of U.S. Pat. No. 8,701,554. [cited by applicant]
Prosecution History of U.S. Pat. No. 8,997,640. [cited by applicant]
Rebuttal Report of Dr. J. Rhett Mayor Re. Validity of U.S. Pat. Nos. 8,307,761, 8,661,970, and 9,795,253. [cited by applicant]
Second Declaration of Dr. J. Rhett Mayor in Support of Preliminary Injunction Re. U.S. Pat. Nos. 8,307,761, 8,661,970, and 9,795,253. [cited by applicant]
Second Expert Declaration of Kelly Homan Re. Invalidity of U.S. Pat. No. 8,307,761. [cited by applicant]
Second Expert Declaration of Kelly Homan Re. Invalidity of U.S. Pat. No. 8,661,970. [cited by applicant]
Second Expert Declaration of Kelly Homan Re. Invalidity of U.S. Pat. No. 9,795,253. [cited by applicant]
Supplemental Expert Declaration of Kelly Homan Re. Invalidity of U.S. Pat. Nos. 8,307,761, 8,661,970, and 9,795,253. [cited by applicant]
Supplemental Declaration of Kelly Homan in Opposition of Preliminary Injunction Re. U.S. Pat. Nos. 8,307,761, 8,661,970, and 9,795,253. [cited by applicant]
The Delfield Company, F5 Serview Drop IN-30 Deep Mirrored Self-Contained Refrigerated Display Cases. [cited by applicant]
The Delfield Company, Mobile Ice Pan Serving Counters, Shelleyglas, Model KCI and KCI-NU, May 2007. [cited by applicant]
Third Declaration of Dr. J. Rhett Mayor in Support of Preliminary Injunction Re. U.S. Pat. Nos. 8,307,761, 8,661,970, and 9,795,253. [cited by applicant]
Wayback Machine Describing Glo-Ray Headed Shelves, Apr. 10, 2004, 2 Pgs. [cited by applicant]
Duke Manufacturing Co. Hot-Cold Convertible Unit Drop In. [cited by applicant]
Duke Manufacturing Co. HB3-1H2C Heritage Buffet—Hot-Cold Cold Pan. [cited by applicant]
Duke Manufacturing Co. E303SW Aerohot Foodservice Hot Food Units—Electric—Sealed Wells. [cited by applicant]
Duke Manufacturing Co. E303-25 AeroServ Serving Systems—Hot Food Units—Electric. [cited by applicant]
Duke Manufacturing Co. E-3-CBSS Thurmaduke Steamtables Hot Food Units—Electric—Standard. [cited by applicant]
Duke Manufacturing Co. Drop Ins. [cited by applicant]
Duke Manufacturing Co. ADI-3E-SW Hot Food Electric—Sealed Well—Drop In. [cited by applicant]
Manufacturing Co. 304-25PG AeroServ Serving Systems—Hot Food Units—Gas. [cited by applicant]
Manufacturing Co. 212-ADI3HC Hot-Cold Convertible Unit Drop In. [cited by applicant]
Declaration of James Bigott Re. Commercial Product Embodied by U.S. Pat. Nos. 8,307,761, 8,661,970, and 9,795,253. [cited by applicant]
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US 12,648,663