US 12543922

Analysis of U.S. Patent 12,543,922

Report Date: April 26, 2026

This report provides a concise summary of U.S. Patent 12,543,922, titled "Dishwasher with a dish rack." The information is based on the full patent text available from the United States Patent and Trademark Office (USPTO) and a review of the dockets for the Court of Appeals for the Federal Circuit (CAFC) for 2026.

I. Patent Overview

Title	Dishwasher with a dish rack
Assignee	Whirlpool Corp
Inventors	Mark S. Feddema, William J. Snell, Sachie Kakehi, Steven B. Balinski, David Jason Brightbill, Joseph T. Ferencevich, Sujit S. Naik, Frederick Thomas Roderick, Ryan Kevin Roth
Filing Date	August 12, 2025
Issue Date	February 10, 2026
Abstract	A dishwasher includes a tub that defines a dish treating chamber. A first lower dish rack and a second lower dish rack are located in the dish treating chamber. An upper dish rack is located above the first lower dish rack and the second lower dish rack in the dish treating chamber. The upper dish rack defines a planar portion and a depression. The depression extends below the planar portion and includes a first angled wall and a second angled wall that each extend at an acute angle relative to the planar portion. The first angled wall defines a first set of cup seats and the second angled wall defines a second set of cup seats. A plurality of utensil holders is disposed in the planar portion and is configured to horizontally support utensils.

II. Independent Claims: A Plain-Language Explanation

U.S. Patent 12,543,922 contains one independent claim. Below is a plain-language overview of this claim.

Independent Claim 1: This claim describes a dishwasher designed with a specific upper dish rack configuration. The key features are:

• An upper dish rack that has both a flat (planar) section and a sunken (depression) section.
• The sunken section has two angled walls, creating seats specifically designed to hold cups.
• The flat section is equipped with holders to support utensils in a horizontal position.
• A crucial aspect of the design is that the entire sunken section for cups is located below the level of the utensil holders on the flat section, creating a distinct multi-level storage area within the same rack.

In essence, this claim protects the specific geometric arrangement of an upper dishwasher rack that combines a flat area for horizontal utensil placement with a recessed, angled area for securely holding cups, all within a single, integrated design.

III. Litigation Search

A search of the CAFC dockets for 2026 for litigation involving U.S. Patent 12,543,922 was conducted. As of the date of this report, no public records of any appeals or lawsuits related to this patent were found in the CAFC 2026 dockets. It should be noted that district court level litigation may exist that has not yet been appealed.

Disclaimer: This summary is for informational purposes only and does not constitute legal advice. The interpretation of patent claims can be complex and may require consultation with a patent attorney.

Litigation Status of U.S. Patent 12,543,922

As of April 30, 2026, a comprehensive search of publicly available litigation databases, including the Unified Patents portal, PACER, and CAFC dockets, reveals no known litigation involving U.S. Patent 12,543,922.

The patent, assigned to Whirlpool Corp, was issued on February 10, 2026. Given the recent date of issuance, it is not unusual that no infringement suits have been filed or recorded yet. While Whirlpool has been active in patent litigation to protect its intellectual property in other areas, such as refrigerator water filters and microwave technology, there is no indication that the '922 patent has been asserted in any legal disputes.

This information is based on data available up to the current date. Future litigation involving this patent would appear in federal court dockets as it is filed.

Proceedings overview

A total of one AIA trial proceeding has been filed against U.S. Patent 12,543,922. This single Post-Grant Review (PGR) is currently pending, initiated by [[[Samsung Electronics Co.](/litigations/by-defendant/Samsung%20Electronics%20Co.), Ltd.](/litigations/by-plaintiff/Samsung%20Electronics%20Co.%2C%20Ltd.) et al.](/litigations/by-plaintiff/Samsung%20Electronics%20Co.%2C%20Ltd.%20et%20al.) As the proceeding is still in its early stages, the patent claims remain untested by the PTAB. This means the patent's validity has not yet been challenged through a final decision at the PTAB, leaving a defendant in a posture where the patent's claims are presumed valid until the resolution of this ongoing PGR.

PGR2026-00043 — Samsung Electronics Co., Ltd. et al. v. Mark S. Feddema et al

• Type: Post-Grant Review
• Filed: 2026-04-14
• Status: Pending. The proceeding is active and has not yet reached an institution decision.
• Judge panel: Information regarding the assigned judge panel is not yet publicly available at this early stage of the proceeding.
• Petition grounds: The specific claims challenged, prior art asserted, and statutory bases (§ 102 / § 103 / § 112) for the petition are not yet publicly detailed in the provided information. However, PGRs typically challenge claims under 35 U.S.C. §§ 101, 102, 103, and 112 (except for best mode).
• Institution decision: Not yet issued. The deadline for the PTAB to decide whether to institute the PGR is approximately six months from the filing date, around October 14, 2026.
• Final Written Decision (if issued): Not applicable, as an institution decision has not yet been rendered.
• Settlement / termination: Not applicable.
• Appeal: Not applicable.
• Defensive value: This proceeding indicates that at least one party (Samsung Electronics Co., Ltd. et al.) believes there are grounds to challenge the patent's validity through a PGR. For a defendant facing assertion of this patent, the outcome of this PGR will be critical. If the claims are cancelled, any infringement theory relying on those claims would be significantly weakened. If institution is denied or claims are sustained, it strengthens the patent owner's position.

Strategic summary

As of May 29, 2026, all claims (Claims 1-26) of U.S. Patent 12,543,922 are currently UNTESTED by a PTAB Final Written Decision. The only active proceeding, PGR2026-00043, is in its nascent stages, with an institution decision still pending. Therefore, there are no claims that have been definitively canceled or sustained by the PTAB.

The estoppel landscape has not yet formed. Since the PGR has not been instituted, and certainly no Final Written Decision has been issued, the petitioner, Samsung Electronics Co., Ltd. et al., is not yet estopped from raising any grounds. For any other potential defendants, all prior-art grounds and statutory challenges remain available for use in future PTAB proceedings (should they be timely filed) or district court litigation.

Regarding pattern signals, only one PGR has been filed to date. This is not unusual given the patent's relatively recent issue date of February 10, 2026. There is no indication of repeated filings by the same petitioner or aggressive PTAB appeals by the patent owner. The petitioner, Samsung Electronics, is a major corporation and a frequent participant in patent litigation and PTAB trials.

Recommended next steps

Given the pending PGR2026-00043, a defendant should closely monitor its progress. The key near-term milestone is the institution decision deadline, expected around October 14, 2026.

• If you are a potential defendant, track this PGR. The petition itself, once publicly available in full on the USPTO PTAB E2E system, will outline the specific arguments and prior art Samsung is using to challenge the patent. This information would be valuable for developing your own defensive strategy, regardless of the PGR's outcome.
• If the PTAB institutes the PGR, it signals that at least some claims have a reasonable likelihood of being found unpatentable, which could influence settlement discussions or litigation strategy.
• If institution is denied, it would suggest the PTAB found the initial challenge insufficient, making subsequent PTAB challenges (particularly by the same petitioner or their privies) more difficult due to estoppel.

At this stage, without an institution decision or Final Written Decision, the patent remains in full force. The absence of further PTAB activity beyond this single PGR is typical for recently issued patents, as it takes time for potential infringers to identify the patent and consider challenges.

Inventors

All nine named inventors—Mark S. Feddema, William J. Snell, Sachie Kakehi, Steven B. Balinski, David Jason Brightbill, Joseph T. Ferencevich, Sujit S. Naik, Frederick Thomas Roderick, and Ryan Kevin Roth—were likely employed by Whirlpool Corp. at the time of filing, as Whirlpool Corp. is listed as the original assignee of the patent. No information suggests any unusual patterns of departure from the original assignee.

Original assignee

The entity named on the issued patent is Whirlpool Corp. Whirlpool Corp. is a multinational manufacturer and marketer of home appliances, a primary line of business that includes dishwashers. As a major appliance manufacturer, Whirlpool Corp. produces and ships products embodying the claims of this patent. Whirlpool Corp. is currently an operating company.

Assignment timeline

The USPTO Assignment Center (https://assignmentcenter.uspto.gov/) has no recorded assignments for U.S. Patent 12,543,922. The "Original Assignee" and "Current Assignee" fields on Google Patents both list Whirlpool Corp, indicating that the patent has remained with the original assignee since its filing.

Timeline diagram

timeline
    title Ownership of US 12543922
    2020 : Filed by Whirlpool Corp (priority date)
    2025 : Application filed by Whirlpool Corp
    2026 : Issued to Whirlpool Corp

NPE / troll-pattern signals

1. Shell-entity transfer — Not present. The patent remains with Whirlpool Corp., a large operating company.
2. Known asserter in the chain — Not present. The patent is held by Whirlpool Corp., not a known NPE.
3. Repeat correspondent across the chain — Not present. There are no recorded assignments for this patent number, so no correspondent chain to analyze.
4. Cascading transfers — Not present. No transfers are recorded.
5. Pre-litigation transfer — Not present. No litigation has been identified, and no transfers are recorded.
6. Bankruptcy fire-sale — Not present. Whirlpool Corp. is an active, operating company.
7. Privateering — Not present. The patent remains with the original operating company.
8. Defensive aggregator (anti-NPE) — Not present. The patent is with Whirlpool Corp., not a defensive aggregator.

Verdict

Operating-company assertion

The verdict is "Operating-company assertion" because the patent is currently assigned to Whirlpool Corp., a well-known operating company that manufactures and sells products directly related to the patent's claims. There are no recorded assignments for this patent number in the USPTO Assignment Center, indicating that ownership has not transferred since its issuance to the original assignee.

For verification, see the USPTO Assignment Center: https://assignmentcenter.uspto.gov/ (search by Patent Number: 12543922).

Analysis of Prior Art for U.S. Patent 12,543,922

Report Date: April 30, 2026

This analysis details the most relevant prior art cited in U.S. Patent 12,543,922 (the '922 patent). The focus is on references that potentially anticipate the independent claim of the '922 patent under 35 U.S.C. § 102, which requires a single prior art reference to disclose every element of a claim.

The primary invention protected by the '922 patent, as defined in independent claim 1, is an upper dish rack in a dishwasher. The key features of this rack are:

1. A planar portion with plurality of utensil holders configured to horizontally support utensils.
2. A depression with a first angled wall and a second angled wall, which define a first and second set of cup seats, respectively.
3. A specific spatial relationship where the depression extends entirely below a top of the utensil holders in the planar portion.

The following analysis examines key prior art references and their relevance to these claimed features.

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1. US Patent Application Publication No. US 2003/0226580 A1

• Full Citation: US 2003/0226580 A1

• Publication Date: December 11, 2003

• Assignee: Maytag Corporation

• Title: Three rack dishwasher

• Brief Description: This publication describes a dishwasher with three vertically spaced dish racks: a lower rack, an upper rack, and a third-level rack positioned above the upper rack. The third-level rack is designed as a shallow drawer for holding cutlery, long utensils, and small items, providing an alternative to a traditional silverware basket.

• Potential Anticipation Analysis:
  This reference is highly relevant as it establishes the concept of a third-level rack for utensils. However, it does not appear to anticipate claim 1 of the '922 patent.

  • What it discloses: It teaches a third rack (analogous to the "upper dish rack" in the '922 patent) designed for horizontally supporting utensils.
  • What it appears to be lacking: The rack described in the '580 publication is primarily a single, shallow tray or planar structure. It does not disclose the combination of a planar portion for utensils alongside a distinct depression featuring first and second angled walls for creating dedicated cup seats. Furthermore, it lacks the claimed spatial relationship where this cup depression extends entirely below the top of the utensil holders. Therefore, it fails to teach multiple key limitations of claim 1.

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2. US Patent Application Publication No. US 2012/0298598 A1

• Full Citation: US 2012/0298598 A1

• Publication Date: November 29, 2012

• Assignee: Miele & Cie. KG

• Title: Dish rack, in particular upper rack

• Brief Description: This Miele publication discloses an upper dish rack with features designed to hold various items securely. It includes a recessed or lowered section in the middle of the rack to create additional vertical space, allowing taller items like stemware to be placed in the rack below it. The lowered section itself can be used to hold cups or small bowls.

• Potential Anticipation Analysis:
  This reference is more relevant as it teaches an upper rack with a varied topography, including a lowered section. However, it likely does not anticipate claim 1.

  • What it discloses: It shows an upper dish rack with a depression or lowered portion to accommodate items. This depression could arguably function as a cup seat.
  • What it appears to be lacking: The '598 publication does not appear to teach the specific combination of a planar portion with dedicated horizontal utensil holders adjacent to the depression. While the raised sides of the rack are planar, their primary function is not described as a dedicated zone for horizontal utensil storage as claimed. Most importantly, the reference does not seem to describe the depression as being formed by two distinct angled walls creating two separate sets of cup seats, nor does it specify that the entire depression must lie below the top of any dedicated utensil holders. The core inventive concept in the '922 patent—the specific, side-by-side integration of a horizontal utensil zone and a dual-angled cup zone—is not explicitly taught.

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3. US Patent Application Publication No. US 2019/0290094 A1

• Full Citation: US 2019/0290094 A1

• Publication Date: September 26, 2019

• Assignee: Whirlpool Corporation

• Title: Low profile rack and wash assembly for dishwasher

• Brief Description: This application, from the same assignee as the '922 patent, describes a low-profile, third-level rack assembly. The design focuses on efficient washing and space utilization, featuring an integrated wash arm that directs water spray to the items on the rack. The rack itself has recessed areas for holding various items like cups and utensils.

• Potential Anticipation Analysis:
  As a recent publication from the same assignee, this reference represents the company's own state of the art prior to the '922 patent's priority date. It is highly relevant but does not anticipate claim 1.

  • What it discloses: It teaches a third-level rack with recessed or depressed portions for holding dishware, including cups. It also features an integrated spraying system, which is a feature discussed in the '922 patent's description and covered by some of its dependent claims (e.g., claims 7-15).
  • What it appears to be lacking: Similar to the other references, the '094 application does not appear to teach the specific combination of all elements of claim 1. While it has recessed areas, it does not clearly describe them as a depression formed by a first angled wall and a second angled wall creating two distinct sets of cup seats. Furthermore, it does not explicitly disclose a separate, dedicated planar portion whose primary feature is a plurality of utensil holders for horizontally supporting utensils, with the cup depression located entirely below these holders. The existence of the '922 patent itself, granted to the same assignee after this application, strongly suggests that the specific geometry and combination of features in claim 1 was considered novel over this prior art.

Obviousness Analysis of U.S. Patent 12,543,922 under 35 U.S.C. § 103

This analysis examines whether the invention claimed in U.S. Patent 12,543,922 (the '922 patent) would have been obvious to a Person Having Ordinary Skill in the Art (PHOSITA) at the time the invention was made. The analysis is based on combinations of the prior art references discussed in the preceding section.

Under 35 U.S.C. § 103, a patent claim is unpatentable if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious to a PHOSITA. This analysis focuses on independent claim 1, which requires the specific combination of a planar portion for horizontal utensils and an adjacent, lower depression with two angled walls for holding cups.

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Primary Obviousness Combination: US 2012/0298598 A1 ('598) in view of US 2003/0226580 A1 ('580)

A strong argument for obviousness can be made by combining the teachings of the Miele patent application ('598) and the Maytag patent application ('580).

1. Base Reference: US 2012/0298598 A1 (Miele)
   The '598 reference teaches the core structural concept of an upper dish rack with varied topography. It explicitly discloses an upper rack with a lowered central section or depression. The stated purpose of this depression is to create additional vertical clearance for tall items in the rack below and to hold items like cups and small bowls. The walls of this depression are inherently angled to form the recessed shape, thus teaching the concept of angled walls creating cup seats.

2. Secondary Reference: US 2003/0226580 A1 (Maytag)
   The '580 reference is directed to the problem of efficiently washing cutlery and long utensils. It teaches a third-level rack that is primarily a shallow, planar portion designed with features (a plurality of utensil holders) to horizontally support utensils. This reference establishes the well-known concept of a dedicated flat rack for such items.

3. Motivation to Combine:
   A PHOSITA, starting with the Miele ('598) design, would recognize its primary benefit: creating a secure, recessed area for cups while increasing the dishwasher's overall capacity for tall items. However, the raised side portions of the Miele rack, while planar, are not optimized for securing long, flat utensils, which could slide and become disorganized.

   The motivation to combine the teachings would arise from the desire to improve the functionality and versatility of the Miele rack. A PHOSITA would be aware of the known solution for organizing flat utensils, as taught by Maytag ('580). They would be motivated to incorporate the dedicated horizontal utensil holders of '580 onto the underutilized planar side portions of the Miele ('598) rack. This combination would achieve the predictable result of a single, multi-functional upper rack capable of securely holding both cups (in the depression) and utensils (on the planar sections) simultaneously. This is not an inventive leap but rather the application of a known feature (horizontal utensil holders) to a known device (an upper rack with a depression) to improve its function in a predictable manner.

4. Meeting All Claim Limitations:

   • Upper Rack with Planar Portion and Depression: This is the direct result of combining the two references.
   • Horizontal Utensil Holders: Taught by '580 and added to the planar portion of '598.
   • First and Second Angled Walls for Cup Seats: The depression in '598 inherently has opposing angled walls to form a trough. It would be a simple and obvious design choice for a PHOSITA to shape these walls to create two distinct rows of cup seats for stability and organization.
   • Depression Extends Entirely Below Utensil Holders: This spatial relationship is the necessary and obvious result of the combination. Adding a depression to a planar rack, or adding utensil holders to the planar portion of a rack that already has a depression, would inherently place the floor of the depression below the top of the utensil holders on the planar surface.

In conclusion, the combination of Miele '598 and Maytag '580 discloses all the structural elements of claim 1, and a PHOSITA would have been motivated to combine them to create a more versatile and organized dishwasher rack, which is a predictable improvement over the prior art.

Term, Application History, and Expiration of U.S. Patent 12,543,922

Report Date: May 1, 2026

This analysis details the prosecution history, patent term data, and projected expiration for U.S. Patent 12,543,922 (the '922 patent), based on the provided patent text and associated metadata from the USPTO.

Patent Term Adjustments (PTA) and Extensions (PTE)

As of the date of this report, the public record for the '922 patent does not specify any awarded Patent Term Adjustment (PTA) or Patent Term Extension (PTE). The standard term for a U.S. patent is 20 years from the earliest effective non-provisional filing date. Any adjustment for prosecution delays by the USPTO would be explicitly stated as PTA. No such adjustment is noted in the provided data.

Application History and Related Family Members

The '922 patent is part of a larger family of applications that claim priority to the same initial invention. The history shows a series of continuation applications, indicating a strategy by the assignee, Whirlpool Corp, to pursue and protect various aspects of the technology.

• Continuation Chain: The '922 patent, which issued from application US 19/297,954 (filed Aug 12, 2025), is a continuation of a prior application. The full lineage, as detailed in the "CROSS-REFERENCE TO RELATED APPLICATIONS" section of the patent, is as follows:

  • It is a continuation of US 19/039,228 (filed Jan 28, 2025).
  • Which is a continuation of US 18/535,327 (filed Dec 11, 2023), now issued as US Patent 12,232,681.
  • Which is a continuation of US 17/830,947 (filed Jun 2, 2022), now issued as US Patent 11,864,712.
  • Which is a continuation of the original parent application, US 16/833,984 (filed Mar 30, 2020), now issued as US Patent 11,375,874.

• Parent Application: The earliest non-provisional application in this chain is US 16/833,984, filed on March 30, 2020. This date serves as the priority date for the entire patent family and the starting point for the 20-year patent term calculation.

• Divisional Applications: There is no indication of any divisional applications in the provided record. The prosecution history consists solely of continuation applications.

• Foreign Counterparts: The patent family includes granted patents in other jurisdictions, indicating international protection for this invention. These include:

  • European Patent: EP3888522B1
  • Chinese Patent: CN113455987B

Projected Expiration Date

The expiration date for the '922 patent is calculated based on its priority date.

• Calculation: The patent term is 20 years from the earliest effective filing date of the non-provisional application, which is March 30, 2020.
• Projected Expiration: Barring any terminal disclaimers or adjustments not noted in the record, the patent is projected to expire on March 30, 2040. This date is listed in the patent's metadata as the "Anticipated expiration." This calculation does not include any potential PTA, which would extend this date, or any failure to pay maintenance fees, which would cause it to expire earlier.

Defensive Disclosure and Prior Art Generation

RE: U.S. Patent 12,543,922 “Dishwasher with a dish rack”
Publication Date: May 1, 2026
Author: Senior Patent Strategist and Research Engineer

This document discloses a series of derivative works, alternative embodiments, and cross-domain applications of the core mechanisms described in U.S. Patent 12,543,922 (the '922 patent). The purpose of this disclosure is to place these variations into the public domain, thereby establishing prior art against future patent applications that may claim these or similar concepts as novel inventions.

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Derivative 1: Material & Component Substitution

Variation 1.1: Shape-Memory Alloy (SMA) Actuated Rack

• Enabling Description: The upper dish rack's utensil holders and cup seat tines are fabricated from a shape-memory alloy, such as Nitinol (Nickel-Titanium). In its martensitic state at room temperature, the holders are in an extended, item-securing position. During the heated drying cycle of the dishwasher, the temperature rises above the alloy's austenite transition temperature (e.g., >85°C). This phase change causes the holders and tines to controllably retract or pivot to a pre-programmed "flat" or "open" geometry. This automated action facilitates easier unloading of dishes and can convert the specialized rack into a general-purpose flat surface for larger items in a subsequent wash cycle. The SMA components are electrically insulated and integrated into the rack's polymer-coated wireframe.
• Mermaid Diagram:

  stateDiagram-v2
      [*] --> Martensite_Phase: Room Temperature (<85°C)
      Martensite_Phase: Holders & Tines Extended
      Martensite_Phase: Securely hold utensils and cups
  
      Martensite_Phase --> Austenite_Phase: Apply Heat (Drying Cycle >85°C)
      Austenite_Phase: Phase Transition Occurs
      Austenite_Phase: Holders & Tines Retract
      Austenite_Phase: Releases items, creates flat surface
  
      Austenite_Phase --> Martensite_Phase: Cool Down (<85°C)
  

Variation 1.2: Modular Piezoelectric Transducer Integration

• Enabling Description: The planar portion and the angled walls of the rack are constructed with integrated docking ports for modular piezoelectric transducer units. These units, encapsulated in waterproof titanium housings, snap into the rack frame. When activated by the dishwasher's controller, they generate high-frequency ultrasonic vibrations (e.g., 40 kHz) directly conducted through the rack's metallic frame. This induces cavitation in the wash water, creating micro-scrubbing actions on the surfaces of utensils and cups in direct contact with the rack, significantly enhancing the cleaning of stubborn food residues. The system uses a low-voltage power connection established when the rack is docked inside the dishwasher tub.
• Mermaid Diagram:

  graph TD
      A[Dishwasher Controller] -- Low Voltage Power --> B{Rack Docking Port};
      B -- Power & Signal --> C{Modular Piezoelectric Units};
      C -- 40 kHz Vibration --> D[Rack Wireframe];
      D -- Conducted Vibration --> E[Utensils & Cups];
      E -- Induces Cavitation in Water --> F[Enhanced Micro-Scrubbing Action];
  

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Derivative 2: Operational Parameter Expansion

Variation 2.1: Industrial Scale Conveyor Washing System

• Enabling Description: The patented rack geometry is implemented as a series of interlocking, modular pallets on an industrial conveyor-based warewashing system. Each pallet, measuring 500mm x 500mm, features the planar utensil section and the depressed cup section. These pallets form a continuous, moving surface through a multi-stage washing tunnel. The system operates with high-pressure spray nozzles delivering water at 80 PSI and a final sanitizing rinse at 185°F (85°C). This application is intended for high-throughput environments like hospitals, cafeterias, and institutional food service operations. The pallets are made from glass-filled polypropylene for high durability and chemical resistance.
• Mermaid Diagram:

  sequenceDiagram
      participant Pallet as Modular Rack Pallet
      participant Conveyor as Conveyor Belt
      participant Stage1 as Pre-Wash Stage (60 PSI)
      participant Stage2 as Main Wash Stage (80 PSI)
      participant Stage3 as Sanitize Rinse (185°F)
  
      Pallet->>Conveyor: Loaded with dishes
      Conveyor->>Stage1: Transport Pallet
      Stage1->>Pallet: High-pressure spray
      Conveyor->>Stage2: Transport Pallet
      Stage2->>Pallet: Detergent wash
      Conveyor->>Stage3: Transport Pallet
      Stage3->>Pallet: High-temp sanitize
      Conveyor-->>Pallet: Emerge clean
  

Variation 2.2: Microfluidic Lab-on-a-Chip Sterilizer

• Enabling Description: A micro-scale version of the invention is used for cleaning and sterilizing laboratory pipette tips and sample vials on a microfluidic chip. The "rack" is a 50mm x 75mm silicon wafer. The "planar portion" is an array of micro-etched channels (1mm width) that hold pipette tips horizontally. The "depression" consists of micro-machined wells with angled walls (30-degree slope) designed to hold 0.5mL microcentrifuge tubes. A programmable syringe pump flushes a sequence of cleaning solvents, deionized water, and finally sterilizing agents (e.g., peracetic acid) through a sealed flow cell containing the chip, ensuring high-purity cleaning of micro-liter scale laboratory equipment.
• Mermaid Diagram:

  graph LR
      subgraph Microfluidic Chip
          A[Planar Micro-Channels for Pipette Tips]
          B[Depressed Micro-Wells for Vials]
      end
      C[Syringe Pump Controller] --> D{Flow Sequencer};
      D -- Step 1 --> E[Solvent Flush];
      D -- Step 2 --> F[DI Water Rinse];
      D -- Step 3 --> G[Sterilizing Agent];
      E --> Chip;
      F --> Chip;
      G --> Chip;
      Chip --> H[Waste Outlet];
  

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Derivative 3: Cross-Domain Application

Variation 3.1: Aerospace Microgravity Tool and Sample Rack

• Enabling Description: A rack for use aboard the International Space Station (ISS) for organizing and sterilizing geological sample containers and maintenance tools. The entire assembly is fabricated from PEEK (Polyether ether ketone) to minimize weight and prevent off-gassing. The planar portion uses spring-loaded clips instead of simple holders to positively lock tools (e.g., wrenches, sample scoops) in place, preventing them from floating away in microgravity. The depressed section features deeper, more steeply angled (45-degree) walls with integrated twist-lock mechanisms to secure sample vials during sterilization cycles using vaporized hydrogen peroxide (VHP).
• Mermaid Diagram:

  classDiagram
      class Rack_Aerospace {
          +material: PEEK
          +planar_section: PlanarSurface
          +depression_section: Depression
      }
      class PlanarSurface {
          +spring_loaded_clips[]
          +lockTool(Tool)
          +releaseTool(Tool)
      }
      class Depression {
          +wall_angle: 45_degrees
          +twist_lock_seats[]
          +secureVial(Vial)
          +releaseVial(Vial)
      }
      Rack_Aerospace *-- PlanarSurface
      Rack_Aerospace *-- Depression
  

Variation 3.2: AgTech Hydroponic System Cleaning Rack

• Enabling Description: An automated cleaning rack for equipment in a vertical farming facility. The depression's "cup seats" are dimensioned to hold standard 2-inch and 3-inch net pots used in hydroponics, orienting them for high-pressure spray cleaning and sterilization to prevent root rot pathogens between growth cycles. The planar portion is fitted with specialized holders for horizontally securing delicate environmental sensors, pH probes, and nutrient injectors, protecting them from damage during the cleaning process. The system is integrated into a larger robotic workflow that automates the harvesting, cleaning, and replanting of hydroponic modules.
• Mermaid Diagram:

  graph TD
      subgraph AgTech Cleaning System
          A[Robotic Arm] --> B(Load Rack);
          B --> C{Hydroponic Rack};
          C -- holds --> D[2" & 3" Net Pots in Depression];
          C -- holds --> E[pH/EC Probes in Planar Section];
          B --> F[Move Rack to Cleaning Bay];
          F --> G[High-Pressure Wash & Sterilize];
          G --> H[Move Rack to Drying Bay];
          H --> I[Robotic Arm Unloads Clean Items];
      end
  

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Derivative 4: Integration with Emerging Tech

Variation 4.1: AI-Optimized Wash Cycle via IoT Load Sensing

• Enabling Description: Each utensil holder and cup seat in the rack is embedded with a passive waterproof RFID tag containing a unique ID. A multi-antenna RFID reader integrated into the dishwasher tub scans the rack upon insertion. The system's edge AI processor queries a database to identify the item type in each location based on pre-registration (e.g., user scans a QR code on a new set of plates). The AI analyzes the specific load composition (e.g., "6 glass cups, 4 ceramic mugs, 12 stainless steel spoons, 1 nylon spatula") and soil level data from a turbidity sensor to dynamically generate an optimal wash cycle, precisely controlling water temperature, pressure, and spray arm choreography to maximize cleaning efficiency and minimize energy and water consumption.
• Mermaid Diagram:

  sequenceDiagram
      participant User
      participant Rack as RFID-Tagged Rack
      participant Reader as Dishwasher RFID Reader
      participant AI as Edge AI Processor
      participant Controller as Dishwasher Controller
  
      User->>Rack: Loads dishes and utensils
      Rack->>Reader: Rack is inserted; Reader scans tags
      Reader->>AI: Sends array of tag IDs
      AI->>AI: Queries item database & turbidity sensor
      AI->>Controller: Generates & sends optimized wash cycle parameters
      Controller->>Controller: Executes dynamic wash cycle
  

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Derivative 5: The "Inverse" or Failure Mode

Variation 5.1: Fusible Link Safety Collapse Mechanism

• Enabling Description: The angled walls forming the rack's depression are attached to the planar sections via hinges incorporating a "fusible link." This link is a structural component made from a bismuth-tin alloy with a precise melting point of 138°C, well above normal operating temperatures but below temperatures indicative of a critical heating element malfunction. If the dishwasher dangerously overheats, these links melt, causing the entire depression structure to collapse downward. This collapse is mechanically coupled to a lever that actuates the dishwasher's main anti-flood water valve, physically shutting off the water supply as a redundant, non-electrical safety measure to prevent further damage or flooding.
• Mermaid Diagram:

  stateDiagram-v2
      state "Normal Operation (<138°C)" as Normal {
          [*] --> Deployed
          Deployed: Depression structure is intact
      }
  
      state "Overheat Failure (>138°C)" as Failure {
          Deployed --> Collapsed: Fusible links melt
          Collapsed: Depression structure collapses
          Collapsed --> Water_Off: Mechanical lever actuates anti-flood valve
      }
  

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Combination Prior Art with Open Standards

1. Combination with MQTT for Smart Home Integration: The AI & IoT enabled rack (Derivative 4.1) is configured as an MQTT client. It publishes its scanned load data to an MQTT broker on a local network (e.g., a Home Assistant server). The data is published to a topic such as home/kitchen/dishwasher/rack_content with a JSON payload like {"cups": 8, "plates": 4, "utensils": 20}. This allows for platform-agnostic integration with any smart home system, enabling open-source automations like "Send a notification to my phone when the dishwasher is full" or "Log dishwasher energy usage per load type to a database."

2. Combination with OPC UA for Industrial Automation: The Industrial Scale Conveyor Washing System (Derivative 2.1) uses the OPC UA (IEC 62541) open standard for machine-to-machine communication. Each modular rack pallet has an OPC UA server that exposes variables for its contents, position on the conveyor, and status (clean/dirty). A central SCADA system acts as an OPC UA client to monitor and control the entire washing line, allowing for interoperability with other factory equipment (e.g., robotic loaders, packaging machines) from different vendors.

3. Combination with glTF for Robotic Interoperability: The manufacturer of a dishwasher featuring this rack geometry publishes a detailed, royalty-free 3D model of the rack in the open glTF (GL Transmission Format). This allows third-party robotics companies and developers to easily import the precise digital twin of the rack into their simulation and programming environments (e.g., ROS, Isaac Sim). This open standard enables any compliant robotic arm to be programmed for loading and unloading tasks without requiring proprietary CAD data or physical access to the appliance, fostering an open ecosystem of automation solutions.