Derivative works — US Patent 11490647

Defensive Disclosure for US Patent 11490647

This document outlines derivative variations of US Patent 11490647, "Sandwich maker for making crustless sealed sandwich," to serve as defensive disclosure. The aim is to create prior art that may render future incremental improvements or alternative implementations by competitors non-novel or obvious, specifically focusing on the core apparatus described in Claim 1.

Core Claim Analyzed: Claim 1 of US11490647

Claim 1 describes a sandwich maker comprising: a primary cutting die (with a first rim, first lateral sidewall, and primary blade) and at least one sealing press (with a second rim, second lateral sidewall, sealing edge, and a specific tapering oblique surface). The lateral sidewalls are coextensive with their respective blades/edges, and the oblique surface tapers from an edge perimetrically connected to the sealing edge towards the second rim. [cite: The provided patent text]

Derivative Variations

1. Material & Component Substitution: High-Performance Ceramic & Polymer Composite Sandwich Maker

Enabling Description:
A sandwich maker fabricated from advanced materials to enhance durability, thermal properties, and hygienic characteristics. The primary cutting die and sealing press components are constructed from a food-grade, high-temperature resistant zirconia ceramic (e.g., yttria-stabilized zirconia), chosen for its extreme hardness, chemical inertness, and ability to maintain a sharp cutting edge over prolonged use. The ceramic primary blade (5) and sealing edge (8) exhibit Rockwell hardness exceeding 80 HRA. The first (4) and second (7) lateral sidewalls, along with the corresponding rims (3, 6), are co-molded or bonded to a structural core of a polyether ether ketone (PEEK) polymer composite reinforced with short carbon fibers (e.g., 30% w/w). This PEEK composite provides high tensile strength (up to 200 MPa), excellent thermal stability (continuous use temperature >250°C), and resistance to common food acids and cleaning agents. The oblique surface (9) of the sealing press is engineered with a micro-texture (e.g., via laser ablation or injection molding with textured inserts) to further enhance non-stick properties and facilitate uniform filling distribution during compression. The assembly method involves high-strength, food-grade epoxy resin bonding for dissimilar materials (ceramic to PEEK) followed by thermal curing, ensuring a hermetic seal and structural integrity.

classDiagram
    class SandwichMaker {
        +PrimaryCuttingDie primaryDie
        +SealingPress sealingPress
    }
    class PrimaryCuttingDie {
        +ZirconiaCeramic primaryBlade
        +PEEKComposite firstRim
        +PEEKComposite firstLateralSidewall
    }
    class SealingPress {
        +ZirconiaCeramic sealingEdge
        +PEEKComposite secondRim
        +PEEKComposite secondLateralSidewall
        +ZirconiaCeramic obliqueSurface
        +MicroTexture microTextureOnObliqueSurface
    }
    SandwichMaker --> PrimaryCuttingDie
    SandwichMaker --> SealingPress
    PrimaryCuttingDie "1" -- "1" firstRim
    PrimaryCuttingDie "1" -- "1" firstLateralSidewall
    PrimaryCuttingDie "1" -- "1" primaryBlade
    SealingPress "1" -- "1" secondRim
    SealingPress "1" -- "1" secondLateralSidewall
    SealingPress "1" -- "1" sealingEdge
    SealingPress "1" -- "1" obliqueSurface
    obliqueSurface "1" -- "1" microTextureOnObliqueSurface

2. Operational Parameter Expansion: Industrial-Scale Automated Sandwich Sealing and Cutting System

Enabling Description:
An automated, continuous-feed sandwich fabrication system. The primary cutting die (1) and sealing press (2) components are integrated into a high-throughput, servo-driven machinery array. The primary cutting die is a gang die assembly capable of cutting multiple bread slices simultaneously, with each primary blade (5) fabricated from hardened stainless steel (e.g., AISI 440C) for sustained sharpness and hygiene. The sealing press (2) operates as a synchronized, pneumatically actuated platten system, applying precisely controlled force (e.g., 500-1500 N per sandwich) and dwelling time (e.g., 0.5-2.0 seconds) to ensure consistent seals across diverse bread types and fillings. The oblique surface (9) is replicated on each sealing platen, constructed from a polished medical-grade stainless steel (e.g., 316L) to prevent sticking and allow for rapid cleaning. Bread slices are conveyed into the system via a cleated conveyor belt system. Filling deposition is managed by a volumetric dosing pump or robotic pick-and-place system, ensuring accurate and repeatable filling quantities. The system incorporates an inline vision inspection system (e.g., using CCD cameras and image processing software) to verify cutting accuracy, seal integrity, and sandwich dimensions, with automated rejection of non-conforming units. The entire system operates at an output rate of up to 120 sandwiches per minute.

flowchart TD
    A[Bread Input Conveyor] --> B{Slice Positioning & Alignment}
    B --> C[Primary Cutting Die Array (Servo-driven)]
    C --> D{Crust Waste Removal}
    D --> E[Filling Deposition System (Robotic/Volumetric)]
    E --> F[Second Bread Slice Placement]
    F --> G[Sealing Press Array (Pneumatic Actuation)]
    G --> H{Seal & Shape Verification (Vision System)}
    H --> I{Product Ejection/Packaging}
    H -- Non-Conforming --> J[Reject Bin]

3. Operational Parameter Expansion: Cryogenic or High-Temperature Rapid Sandwich Preparation Device

Enabling Description:
A specialized sandwich maker capable of operating under extreme thermal conditions for rapid preparation of either frozen or hot-sealed crustless sandwiches.
For Cryogenic Operation (Frozen Sandwiches): The primary cutting die (1) and sealing press (2) are constructed from a low-thermal-expansion coefficient alloy, such as Invar 36, or a cryo-compatible polymer composite (e.g., PTFE-filled PEEK) to prevent material distortion at temperatures as low as -196°C (liquid nitrogen). The blades (5) are designed with a serrated edge or micro-sawtooth pattern for clean cutting of partially frozen bread. The sealing edge (8) is designed to create a flash-freeze seal using localized cold application, potentially via integral micro-channels circulating a cryogenic fluid (e.g., chilled brine or liquid nitrogen vapor) or by rapid contact with pre-chilled elements. The oblique surface (9) applies precise compression to uniformly distribute rapidly freezing fillings, preventing ice crystal formation along the seal line.
For High-Temperature Operation (Hot-Sealed Sandwiches): The components are fabricated from a high-temperature resistant ceramic (e.g., silicon nitride) or a specialized alloy (e.g., Hastelloy X) capable of sustaining temperatures up to 300°C. The sealing press (2) incorporates integrated resistive heating elements or inductive heating coils to rapidly heat the sealing edge (8) and oblique surface (9). This heat creates a localized melt-seal (e.g., for bread with high starch content or heat-activated edible film layers) or a toasted crimp, achieving a hermetic seal in under 5 seconds. Thermal insulation is strategically placed to protect external user contact points while rapidly transferring heat to the bread interface.

stateDiagram-v2
    state "Idle" as Idle
    state "Material Loading" as Loading
    state "Cutting Stage" as Cutting
    state "Filling & Second Bread" as Filling
    state "Sealing Stage" as Sealing
    state "Ejection" as Ejection
    state "Cryogenic Cooling" as Cryo
    state "High-Temp Heating" as Heat

    Idle --> Loading : User Initiates
    Loading --> Cutting : Bread Placed
    Cutting --> Filling : Bread Cut
    Filling --> Sealing : Filling & Top Bread Placed

    Sealing --> Cryo : Mode = Cryogenic
    Sealing --> Heat : Mode = High-Temperature

    Cryo --> Ejection : Frozen Seal Complete
    Heat --> Ejection : Hot Seal Complete
    Ejection --> Idle : Sandwich Dispensed

4. Cross-Domain Application: Precision Edible Wafer Fabrication Tool for Pharmaceutical Encapsulation

Enabling Description:
An apparatus derived from the sandwich maker, adapted for pharmaceutical manufacturing to encapsulate active pharmaceutical ingredients (APIs) between two edible, dissolvable wafer layers, forming a precisely dosed "sandwich" tablet. The primary cutting die (1) becomes a precision wafer cutter, with primary blades (5) made from polished 316L stainless steel, designed to excise specific shapes from thin, pre-formed sheets of pharmaceutical excipients (e.g., carboxymethyl cellulose or pullulan films). The first lateral sidewall (4) and rim (3) provide a sterile housing for the cutting action. The sealing press (2) functions as a low-force, precision-sealing head. Its sealing edge (8) is equipped with a micro-heater or ultrasonic welding transducer to form a hermetic, moisture-resistant seal between the two wafer layers. The oblique surface (9) is meticulously smooth and chemically inert (e.g., PEEK or medical-grade ceramic) and applies a gentle, controlled compression (e.g., 0.1-1.0 N/cm²) to uniformly spread the API (e.g., a powdered drug or gel formulation) between the wafers without crushing or compromising the dose. All components are sterilizable via autoclave or gamma irradiation and designed for use within a cleanroom environment (ISO Class 7 or higher).

classDiagram
    class PharmaEncapsulator {
        +WaferCutter waferCutter
        +SealingHead sealingHead
    }
    class WaferCutter {
        +StainlessSteelBlade primaryBlade
        +SterileHousing firstRim
        +SterileHousing firstLateralSidewall
        +ExcipientSheet waferMaterial
    }
    class SealingHead {
        +MicroHeaterOrUltrasonicTransducer sealingEdge
        +SterileHousing secondRim
        +SterileHousing secondLateralSidewall
        +PEEKOrCeramic obliqueSurface
        +API apiDose
    }
    PharmaEncapsulator --> WaferCutter
    PharmaEncapsulator --> SealingHead
    WaferCutter "1" -- "1" primaryBlade
    WaferCutter "1" -- "1" firstRim
    WaferCutter "1" -- "1" firstLateralSidewall
    SealingHead "1" -- "1" sealingEdge
    SealingHead "1" -- "1" secondRim
    SealingHead "1" -- "1" secondLateralSidewall
    SealingHead "1" -- "1" obliqueSurface

5. Cross-Domain Application: Bio-Tissue Culture Scaffold Former for Regenerative Medicine

Enabling Description:
An apparatus for creating multi-layered, sealed hydrogel scaffolds for in-vitro 3D cell culture in regenerative medicine research. The primary cutting die (1) is adapted to precisely cut shapes from bio-compatible polymer films (e.g., PLGA, PCL) or pre-cast hydrogel sheets, forming the foundational layers of the scaffold. The primary blade (5) is a micro-machined, sterilized medical-grade titanium blade with a cutting tolerance of ±10 µm. The first lateral sidewall (4) and rim (3) are constructed from bio-inert, autoclavable materials. The sealing press (2) is modified to create a sterile, liquid-tight seal between multiple hydrogel layers, encapsulating cell populations or growth factors within the scaffold. The sealing edge (8) utilizes a localized UV-curable resin or a solvent-bonding mechanism (e.g., mild plasma treatment) to create a bio-compatible interface without thermal damage to cells. The oblique surface (9), made of polished PTFE, applies a gentle, uniform hydrostatic pressure to ensure even distribution of cell-seeded hydrogel solutions between the layers before sealing, preventing cell aggregation or shear stress. The entire device operates within a laminar flow hood, ensuring aseptic conditions.

graph TD
    A[Sterile Biopolymer Film/Hydrogel Sheet] --> B{Primary Cutting Die - Micro-Machined Titanium Blade}
    B --> C[Shaped Scaffold Base Layer]
    C --> D[Cell-Seeded Hydrogel/Growth Factor Deposition]
    D --> E[Second Scaffold Layer Placement]
    E --> F{Sealing Press - UV/Solvent Bonding Edge}
    F --> G[Oblique Surface - Gentle Hydrostatic Compression]
    G --> H[Sealed 3D Cell Culture Scaffold]

6. Integration with Emerging Tech: AI-Optimized Smart Sandwich Maker with IoT Food Monitoring

Enabling Description:
A "smart" sandwich maker incorporating IoT sensors and an AI-driven optimization module. The primary cutting die (1) and sealing press (2) components are constructed from food-grade transparent polycarbonate, embedded with micro-LIDAR sensors or capacitive touch arrays along the inner surfaces of the cutting blade (5) and sealing edge (8). These sensors provide real-time dimensional feedback on bread thickness, crust presence, and filling distribution. An integrated ARM Cortex-M4 microcontroller processes this data, transmitting it via Wi-Fi (IEEE 802.11ah) to a cloud-based AI engine. The AI engine, trained on a dataset of optimal sandwich parameters (e.g., bread type, filling viscosity, desired seal strength, bulge aesthetic), dynamically adjusts the actuation force and dwell time of the sealing press (now electromechanically actuated with a stepper motor and lead screw assembly). For instance, if the AI detects thinner bread or a drier filling, it can recommend a lower sealing force to prevent tearing or adjust the oblique surface's effective angle (via minor positional adjustments using micro-servos) to achieve the desired dome shape. An integrated RFID reader identifies compatible ingredient trays (e.g., "Smart Bread Loaf," "Smart Peanut Butter Jar"), allowing the AI to access ingredient-specific properties (e.g., moisture content, recommended sealing temperature) for enhanced optimization. User feedback via a companion mobile application further refines the AI's models.

sequenceDiagram
    User->>SmartSandwichMaker: Initiate Sandwich Prep
    SmartSandwichMaker->>Bread: Measure Thickness/Crust (LIDAR/Capacitive)
    Bread->>SmartSandwichMaker: Dimensional Data
    SmartSandwichMaker->>Filling: Identify Type (RFID)
    Filling->>SmartSandwichMaker: Ingredient Properties
    SmartSandwichMaker->>CloudAI: Send Data (IoT - Wi-Fi)
    CloudAI-->>SmartSandwichMaker: Optimized Actuation Parameters (Force, Dwell, Oblique Angle)
    SmartSandwichMaker->>PrimaryCuttingDie: Execute Cut
    SmartSandwichMaker->>SealingPress: Execute Seal (Stepper Motor)
    SmartSandwichMaker->>User: Completion Notification (App/LED)

7. The "Inverse" or Failure Mode: Low-Power, Manual-Assist Sandwich Prep Kit with Safety Release

Enabling Description:
A minimalist sandwich preparation kit designed for safety, low power consumption, and graceful degradation in functionality. The primary cutting die (1) and sealing press (2) are constructed from medical-grade silicone (Shore A hardness 60-70), allowing for flexible, non-sharp edges that minimize injury risk while still effectively cutting bread and sealing. The primary blade (5) is a blunted silicone edge that requires greater manual force or multiple passes but removes crusts without sharp metal exposure. The sealing press (2) features a passive, spring-loaded mechanism that provides a pre-set, low compression force (e.g., 5-10 N) upon manual actuation. The oblique surface (9) is a soft, deformable silicone ramp that provides a gentle bulge rather than a rigid dome, reducing stress concentrations on the bread. In case of excessive manual force, a mechanical shear pin or pressure-sensitive rupture diaphragm is integrated into the handle (not explicitly claimed but implicitly part of user interaction) of the sealing press. This pin/diaphragm is designed to break/release at a predetermined load (e.g., >200 N), preventing damage to the bread or tool and signaling over-exertion without critical failure of the primary components. This "fail-safe" mechanism ensures that even if too much force is applied, the device simply releases pressure rather than causing structural damage or irreversible sandwich deformation. The entire kit is designed to be dishwasher safe and operate without electricity.

stateDiagram-v2
    state "Idle (Components Separated)" as Idle
    state "Bread Placed in Cutting Die" as CuttingLoad
    state "Manual Cutting Action" as CuttingActive
    state "Bread Cut (Crust Removed)" as CutDone
    state "Bread & Filling in Sealing Press" as SealingLoad
    state "Manual Sealing Action (Low Force)" as SealingActive
    state "Safety Release Triggered" as SafetyRelease
    state "Sandwich Sealed (Gentle)" as SealDone

    Idle --> CuttingLoad : User Loads Bread
    CuttingLoad --> CuttingActive : User Applies Force
    CuttingActive --> CutDone : Crust Removed
    CutDone --> SealingLoad : User Transfers Bread/Adds Filling
    SealingLoad --> SealingActive : User Applies Force
    SealingActive --> SafetyRelease : Applied Force > Threshold
    SealingActive --> SealDone : Applied Force <= Threshold
    SafetyRelease --> SealingLoad : Pressure Released, Reset
    SealDone --> Idle : Sandwich Removed

Combination Prior Art Scenarios

US11490647 + Open-Source 3D Printing Standards:
Combining the design principles of US11490647 (specifically Claim 1, including the cutting die and oblique sealing surface) with open-source 3D printing standards (e.g., STL file format specifications, G-code for FDM printers, and publicly available food-safe filament formulations like PLA or PETG). This combination allows for on-demand fabrication of custom-shaped sandwich makers, enabling users to download open-source design files (e.g., from Thingiverse or Printables licensed under Creative Commons) and print the device themselves. This democratizes the production of such tools, allowing for rapid iteration and personalization of the cutting and sealing elements (e.g., different protrusion patterns, unique oblique surface geometries).
US11490647 + Open-Source Computer Vision Libraries (e.g., OpenCV):
Integrating the sandwich maker with an open-source computer vision system (e.g., a webcam and a Raspberry Pi running OpenCV) for real-time monitoring and feedback. The camera system can analyze the bread's positioning before cutting, the alignment of the top and bottom bread slices, and the sealing quality (e.g., identifying gaps or uneven crimps). The OpenCV library provides algorithms for edge detection, shape recognition, and color analysis, enabling the system to provide visual feedback to the user via a simple GUI or colored LEDs on the device. This allows for DIY "smart" enhancements to the manual process, improving consistency and reducing errors in achieving perfectly sealed, crustless sandwiches.
US11490647 + Open-Source Firmware for Microcontrollers (e.g., Arduino/ESP32 platforms):
Combining the mechanical design of US11490647 with an open-source microcontroller platform (e.g., Arduino or ESP32) and custom firmware. This enables the development of semi-automated or assistive versions of the sandwich maker. For example, a force sensor (e.g., load cell) integrated into the sealing press (2) could communicate with an Arduino, which then controls an LED array to guide the user in applying the optimal sealing force for different bread types, based on pre-programmed parameters or user-defined preferences. The firmware could also manage a small heating element for a "warm seal" feature, ensuring safe temperature control and timed operations according to open-source protocols for heating small appliances.