3D Printing Conductive Plastics Without Melting Them
This patent describes a method for 3D printing objects and coatings from conductive plastics by mixing polymer and conductive fillers in a solid-state process, rather than melting them, to create parts that can conduct electricity or heat.
Original patent title: “Solid-state additive manufacturing methods for compounding conductive polymer compositions”
This patent describes a method for 3D printing objects and coatings from conductive plastics by mixing polymer and conductive fillers in a solid-state process, rather than melting them, to create parts that can conduct electricity or heat. Granted to Meld Manufacturing in 2025 with 21 claims, and it is expected to expire in 2041.
Coverage
What does this patent actually cover?
This method creates conductive plastic parts or coatings using a process called solid-state additive manufacturing. It involves feeding at least one conductive solid filler (like carbon nanotubes or graphite) and at least one polymer or plastic through a hollow spindle or tool. This tool has a shoulder that rotates, applying normal, shear, and frictional forces. These forces cause the materials to deform plastically, meaning they change shape permanently without fully melting, entering a malleable or visco-elastic state. The materials are then deposited onto a substrate, forming a conductive 3D object or a coating, which can be electrically conductive, thermally conductive, or both, as described in claimclaimA numbered sentence at the end of a patent that legally defines what the inventor owns. The most important section.Read more → 1 and 5. For example, it can create an anti-static coating (claim 8) or a coating for electromagnetic interference (EMI) shielding (claim 10).
The gap
What does this patent NOT cover?
- Does not cover traditional 3D printing methods that fully melt plastic filaments, like Fused Deposition Modeling (FDM) or Fused Filament Fabrication (FFF).
- Does not cover additive manufacturing techniques that rely on liquid resins (SLA) or powder beds (SLS, binder jetting) without the specific solid-state deformation process.
- Does not cover creating conductive plastic parts by simply mixing pre-made conductive plastic pellets and then melting them in a conventional injection molding process.
- Does not cover methods that achieve conductivity by coating a non-conductive plastic part after it has been formed, rather than during the additive manufacturing process.
- Does not cover processes that do not involve generating plastic deformation through normal, shear, and/or frictional forces from a rotating hollow spindle or tool.
These exclusions are unique to PatentBrief — derived from the actual claim language, not patent-office boilerplate.
Key facts
What made this novel
The noveltynoveltyThe requirement that an invention be different from anything publicly known before its priority date.Read more → lies in using solid-state additive manufacturing for plastics, which typically involves high heat and pressure but avoids full melting. This allows for compounding conductive fillers directly into the polymer during the printing process, creating a strong bond and precise control over conductivity, without the degradation that can occur with traditional melt-based methods.
The Patent Drawing
Schematic visualization of the patent's claim structure. Hand-drawn diagrams in progress for each landmark patent.
Where you've seen this
Real-world examples
Heat sinks for small electronic components made from plastic
Anti-static enclosures for sensitive electronics
Electromagnetic interference (EMI) shielding for communication devices
Thermally conductive housings for LED lighting
Custom sensors or circuit traces embedded within plastic parts
Why it matters
The bigger picture
Conductive plastics are essential for many modern technologies, from dissipating heat in electronics to shielding sensitive components from electromagnetic interference. This patent offers a way to precisely integrate these properties directly into 3D printed plastic parts or coatings. It also proposes methods for recycling plastic waste by mixing it with new materials or conductive fillers, which could reduce manufacturing costs and environmental impact.
Filed
March 10, 2021
Granted
February 25, 2025
Market context
Who's building on this
Companies in this space
Meld Manufacturing Corp, the assigneeassigneeThe entity that owns the patent — usually the inventor's employer or a company.Read more →, is actively developing and commercializing solid-state additive manufacturing technology. They focus on using this process for various materials, including metals and composites, and are likely to apply this patent's principles to expand their offerings in conductive plastic applications. Other companies in advanced materials and additive manufacturing are also exploring similar solid-state approaches for diverse applications.
Market impact
This technology could enable the creation of new product categories by allowing complex, custom conductive plastic components to be manufactured on demand. It offers an alternative to traditional manufacturing methods for parts requiring specific thermal or electrical properties, potentially reducing costs and lead times. The ability to incorporate recycled plastics also positions it to impact sustainable manufacturing practices within the industry.
Claim 1 — Plain English
What this patent covers
This method creates conductive plastic parts or coatings using a process called solid-state additive manufacturing. It involves feeding at least one conductive solid filler (like carbon nanotubes or graphite) and at least one polymer or plastic through a hollow spindle or tool. This tool has a shoulder that rotates, applying normal, shear, and frictional forces. These forces cause the materials to deform plastically, meaning they change shape permanently without fully melting, entering a malleable or visco-elastic state. The materials are then deposited onto a substrate, forming a conductive 3D object or a coating, which can be electrically conductive, thermally conductive, or both, as described in claim 1 and 5. For example, it can create an anti-static coating (claim 8) or a coating for electromagnetic interference (EMI) shielding (claim 10).
The clever bit
The novelty lies in using solid-state additive manufacturing for plastics, which typically involves high heat and pressure but avoids full melting. This allows for compounding conductive fillers directly into the polymer during the printing process, creating a strong bond and precise control over conductivity, without the degradation that can occur with traditional melt-based methods.
What it does not cover
- Does not cover traditional 3D printing methods that fully melt plastic filaments, like Fused Deposition Modeling (FDM) or Fused Filament Fabrication (FFF).
- Does not cover additive manufacturing techniques that rely on liquid resins (SLA) or powder beds (SLS, binder jetting) without the specific solid-state deformation process.
- Does not cover creating conductive plastic parts by simply mixing pre-made conductive plastic pellets and then melting them in a conventional injection molding process.
- Does not cover methods that achieve conductivity by coating a non-conductive plastic part after it has been formed, rather than during the additive manufacturing process.
- Does not cover processes that do not involve generating plastic deformation through normal, shear, and/or frictional forces from a rotating hollow spindle or tool.
Patent timeline
Application submitted to the patent office
Application published, typically 18 months after filing
Patent officially issued
Patent enters public domain
PatentBrief Score
Impact Score
Early stage
Citation count
0/40
No citations yet
Claim breadth
14/20
Broad claimsclaimsThe numbered statements at the end of a patent that legally define what the inventor owns.Read more →
Recency
20/20
Granted within 5 years
Assignee scale
0/20
Independent or smaller assigneeassigneeThe entity that owns the patent — usually the inventor's employer or a company.Read more →
PatentBrief Impact Score — based on citation count, claim breadth, recency, and assignee scale. Not a legal assessment.
Heuristic Value Estimate
What this patent might be worth
$21K – $67K
Midpoint $42K · 14.4 yr remaining · industry ×0.9
Heuristic only — blends forward/backward citation counts, claim scope, time remaining, litigation history, and CPC-derived industry baseline. Real valuations need a professional appraisal.
Claim text not yet imported for this patent
The original legal language
Original claims
21 claims as filed with the patent office.
Concepts involved
Citations
Patent lineage
Cite this patent
Broach, A. T., Cox, C., & Hardwick, N. (2025). 3D Printing Conductive Plastics Without Melting Them (U.S. Patent No. 12,233,592). U.S. Patent and Trademark Office. https://patentbrief.org/patent/us/12233592/solid-state-additive-manufacturing-methods-for-compounding-conductive-polymer-co
Auto-generated from the patent record. Double-check author order and the issue date against the official USPTO document before submitting.
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Common Questions
Frequently Asked Questions
What does 3D Printing Conductive Plastics Without Melting Them cover?
This patent describes a method for 3D printing objects and coatings from conductive plastics by mixing polymer and conductive fillers in a solid-state process, rather than melting them, to create parts that can conduct electricity or heat.
Who owns patent US 12233592?
Meld Manufacturing owns this patent, granted in 2025.
When does this patent expire?
This patent is expected to expire on March 10, 2041, when the invention enters the public domain.
What problem does this patent solve?
Conductive plastics are essential for many modern technologies, from dissipating heat in electronics to shielding sensitive components from electromagnetic interference. This patent offers a way to precisely integrate these properties directly into 3D printed plastic parts or coatings. It also proposes methods for recycling plastic waste by mixing it with new materials or conductive fillers, which could reduce manufacturing costs and environmental impact.
What does this patent NOT cover?
Does not cover traditional 3D printing methods that fully melt plastic filaments, like Fused Deposition Modeling (FDM) or Fused Filament Fabrication (FFF).
Same assignee
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