FDM Interface Engineering Patents: Leaders, Trends & White Space 2026
- 59 families, no dominant filer. the strongest co-filing pair appears only twice, and the field has no single assignee with a commanding position.
- Filing dipped to zero at the 2022 midpoint, then resumed. activity peaked early at 13 filings in 2017 and is rebuilding rather than following a steady climb.
- Academic labs are driving the newest momentum. engineering colleges and university institutes account for the fastest year-on-year gains, ahead of established manufacturers.
Filing growth compares 2021 (1 records) with 2024 (3) — a three-year span. 2024 is the most recent year we treat as complete: publication lags filing by roughly 18 months, so 2025 onwards are still filling in and any growth rate that ends there would understate the field. Top-5 share is the combined record count of the five largest assignees divided by all 59 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
Interlayer bonding is the mechanical weak point of every fused deposition modeling and fused filament fabrication part: strength across a bond line is almost always lower than strength within a single bead, and closing that gap is where most of the patenting activity in this dataset sits. This landscape isolates 59 patent families published between 2015 and mid-2026 that claim inter-bead adhesion, inter-layer weld strength, or bond-quality control specifically within FDM/FFF processes, filtered to the additive-manufacturing, plastics-shaping and powder-metallurgy IPC classes where these claims are actually drafted.
The corpus spans both polymer and metal build materials — Joule heating, ultrasound-assisted nozzles and laser preheating all appear as bonding strategies — which is why powder-metallurgy classifications sit alongside plastics-shaping ones. Filing offices skew heavily toward the United States and India, with China, Europe and WIPO contributing smaller, more recent shares.
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Filing trend and technology mix
Two views of the same 59 families: how filing volume has moved year over year, and which IPC subclasses those filings actually sit in.
A field that stalled, then restarted
Filings opened strong at 13 in 2017, fell away through the early 2020s, hit zero at the 2022 midpoint, and have been accelerating since — six filings are already recorded in the most recent, still-partial year. Because publication lags filing by roughly 18 months, the true count for the last one to two years will read higher once the backlog clears.
Where the claims are drafted
B33Y (additive manufacturing) and B29C (plastics shaping) dominate, appearing in 51 and 38 records respectively, confirming this is primarily a polymer-process filing base. B22F (powder metallurgy) at 26 records shows a substantial metal-build-material sub-track — Joule heating and ultrasound nozzle claims sit here — while control systems (G05B) and digital processing (G06F) remain thin, single-digit categories.
Shares are the percentage of the 59 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Fused Deposition Modeling Interface Engineering with Eureka
This page is one run against one query. Ask Eureka your own question about fused deposition modeling interface engineering and every answer comes back with the patent numbers behind it.
Try EurekaA representative claim
Joule heating for improved interlayer bonding in fused filament fabrication of metallic objects
A printer fabricates an object from a computerized model using a fused filament fabrication process and a metallic build material. Joule heating is applied to an interface between adjacent layers of the object by creating an electrical circuit across the interface and applying pulsed current sufficient to join the metallic build material across the adjacent layers.Filed by Desktop Metal, Inc., published 2017-06-22 as US20170173693A1.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20170173692A1 | Metal printer with vibrating ultrasound nozzle | 110 |
| 2 | WO2017152142A1 | Additive manufacturing with metallic build materials | 90 |
| 3 | US20170173879A1 | Fused filament fabrication extrusion nozzle with concentric rings | 70 |
| 4 | US20170072633A1 | Systems and methods for laser preheating in connection with fused deposition modeling | 70 |
| 5 | US20180304370A1 | Layer-forming nozzle exit for fused filament fabrication process | 47 |
| 6 | US20170252819A1 | Build surfaces for semi-solid metallic additive fabrication | 44 |
| 7 | US10232443B2 | Fused filament fabrication | 38 |
| 8 | US20170252812A1 | Spread forming deposition | 33 |
| 9 | US20170173695A1 | Additive manufacturing with temporal and spatial tracking of thermal information | 31 |
| 10 | US20170252817A1 | Nozzle cleaning for semi-solid deposition nozzles | 30 |
Citation counts favour older records simply because they have had more time to accumulate citations within this corpus — read them as a signal of influence, not current relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Three read-throughs from the filing trend, the technology mix and the citation table.
Restart, not a steady climb
The 2017 peak of 13 filings was followed by a collapse to zero by 2022, then renewed filing through to the present. That shape points to an initial wave of foundational claims, a fallow period once the obvious ground was covered, and a second wave now probing narrower mechanisms.
Two build-material tracks, one problem
Polymer-focused B33Y/B29C claims outnumber metal-focused B22F claims by roughly two to one, but the metal track is far from token — 26 records show sustained interest in fusing metal beads via Joule heating, ultrasound and laser preheating rather than pure thermal contact.
Early nozzle and heating patents anchor the field
The most-cited records are early nozzle-geometry and preheating patents from 2017–2018, which is expected given how citation counts accumulate — newer bond-quality-control filings have not had time to build comparable citation counts yet.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to fused deposition modeling interface engineering, with the prior art for and against each one.
| Assignee | Co-assignee | Shared families |
|---|---|---|
| HSU KENG | HAN PU | 2 |
| EASWARI ENG COLLEGE | SRM INST OF SCI & TECH (RAMAPURAM CAMPUS) | 1 |
| CHAITANYA BHARATHI INST OF TECH | MS VARIMADUGU SANDHYA | 1 |
| CHAITANYA BHARATHI INST OF TECH | MS JYOTHIRMAYI NARNE | 1 |
| CHAITANYA BHARATHI INST OF TECH | DR V JAIPAL REDDY | 1 |
| CHAITANYA BHARATHI INST OF TECH | DR NAGINI YARRAMSETTY | 1 |
| CHAITANYA BHARATHI INST OF TECH | DR M V J RAJU | 1 |
| CHAITANYA BHARATHI INST OF TECH | DR BALIVADA VENKATA SHANMUKESWAR RAO | 1 |
Only 9 co-assignee pairs exist across 59 families, and none appear more than twice — this is a field of independent filers, not joint-development programs.
Who is filing, and where the gaps sit
No assignee in this dataset holds a commanding share of the 59 families. Momentum has shifted toward academic institutions filing small, recent batches, while several earlier corporate and university filers have gone quiet.
Academic labs lead recent activity
Easwari Engineering College and Chaitanya Bharathi Institute of Technology each recorded two filings in the latest year, ahead of every corporate assignee tracked. Their co-filing links to other Indian institutes suggest coordinated, campus-based research programs rather than isolated inventors.
Earlier filers have stopped, not exited outright
Assignees including Hsu Keng, Shandong University of Technology and Sichuan University show zero filings in the most recent year after earlier activity. Zero recent filings in a 59-family dataset can mean a program paused as easily as it can mean abandonment — worth a direct check before assuming exit.
Collaboration is thin and localized
The strongest pairing, Hsu Keng with Han Pu, appears in only two families; the rest are single instances, mostly linking Indian engineering colleges to affiliated institutes. There is no cross-border or cross-sector collaboration signal in this corpus.
| Assignee | Recent year | YoY |
|---|---|---|
| EASWARI ENG COLLEGE | 2 | +100% |
| CHAITANYA BHARATHI INST OF TECH | 2 | — |
| Desktop Metal, Inc. | 0 | — |
| HSU KENG | 0 | — |
| Shandong University of Technology | 0 | -100% |
| Sichuan University | 0 | — |
| SAVEETHA INST OF MEDICAL & TECH SCI | 0 | -100% |
| HAN PU | 0 | — |
Where to take this
The filing trend and gap map point to specific next steps depending on what you are trying to protect or clear.
Check freedom-to-operate around metal bead fusion
Joule heating, ultrasound nozzles and laser preheating are the three documented approaches to metal interlayer bonding, and the earliest, most-cited records in this space are now nearing the end of their priority window. Confirm current enforceability before committing a metal-FDM design to one of these mechanisms.
Explore metal bonding claims in EurekaDraft around the under-claimed control layer
Closed-loop temperature control and real-time bond-quality sensing sit outside the current claim density shown here. A first claim combining an in-process sensor signal with an adjustment to print parameters would sit in largely open ground.
Draft a claim in EurekaWatch academic filers for licensing or hiring signals
The institutions showing the strongest recent momentum are university labs, not established manufacturers. Their next 12–18 months of filings — still lagging in publication — are worth monitoring for early licensing opportunities.
Track assignee activity in EurekaCommon questions on this landscape
Interlayer bonding is the strength of the weld between successive printed layers or beads in an FDM/FFF part, and it is typically the mechanical weak point of the finished object. Because parts fail along these bond lines under load, controlling bond quality — through heating strategy, nozzle design or material chemistry — is where most of the inventive activity in this field concentrates. Patent claims in this space typically cover a mechanism (such as pulsed current, ultrasound or preheating) applied at or near the layer interface, rather than the printer or material alone.
No single company holds a dominant position across the 59 families tracked in this dataset. The strongest co-filing relationship appears only twice, and recent filing momentum is led by academic institutions rather than established manufacturers. Earlier corporate filers associated with the most-cited records, such as those behind the early nozzle and preheating patents, remain influential by citation count but are not necessarily the most active filers today.
Filing activity peaked at 13 in 2017, declined through the following years, and reached zero at the 2022 midpoint before resuming. This pattern is consistent with an initial wave of foundational claims covering the obvious bonding mechanisms, followed by a fallow period, and then a second wave now targeting narrower or more specific approaches. Publication lag of roughly 18 months also means recent-year counts, including the current one, are understated until the backlog of filed-but-unpublished applications clears.
Polymer-focused claims sit mainly in the B33Y and B29C classifications and cover thermal contact, layer adhesion promoters and print-parameter control for plastic filament. Metal-focused claims sit in B22F, powder metallurgy, and cover mechanisms like Joule heating, ultrasound-assisted nozzles and laser preheating to fuse metal build material across layers — a fundamentally different bonding physics problem. Both tracks appear substantially in this dataset, with polymer claims outnumbering metal claims by roughly two to one.
Based on the current claim density, real-time bond-quality sensing, closed-loop interlayer temperature control, and in-process weld-strength verification appear thinly covered relative to the heating and nozzle-design mechanisms that dominate the corpus. A claim combining an in-process sensor signal with an automated adjustment to print parameters would likely sit in more open ground than another heating-mechanism claim. This is a read of current claim density, not a freedom-to-operate opinion, so a formal clearance search is still needed before relying on it.
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Disclaimer. This page is generated from Patsnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing on this page constitutes an exhaustive prior-art, novelty, freedom-to-operate, or validity search, nor does it constitute legal, financial, investment, or professional advice, and it should not be relied upon as such. Any patent, commercial, or strategic decision should be verified independently and reviewed with qualified patent, legal, and domain professionals. Patsnap makes no warranties, express or implied, as to the accuracy, completeness, or fitness for any particular purpose of the information presented.
Machine translation. Assignee and organisation names originally recorded in Chinese, Japanese or Korean have been rendered into English by an AI translation step so that the tables stay readable. These renderings are best-effort and may not match a company’s registered English name; the original name is what the underlying patent record carries, and it is what any Eureka query launched from this page uses.