SMC/BMC Molding Patents: Leaders, Trends & White Space 2026
- 48.3% of all 118 records sit with just five assignees — filing here is concentrated, not fragmented.
- Filing peaked in 2017 at 10 records and has run flat-to-declining since, with the 2022 midpoint at just 2.
- C08J polymer processing appears in 61.9% of records while base plastics preparation (B29B) sits at only 11.0% — a thin layer beneath a crowded surface-finish literature.
What this patent set covers
Sheet molding compound (SMC) and bulk molding compound (BMC) processing sits at the intersection of composite chemistry and compression-molding tooling. This landscape tracks 118 published records filed between 2015 and mid-2026 that combine SMC/BMC terminology with claims touching flow behavior during compression, fiber orientation, class A surface finish, low-profile additive chemistry, or cycle time — and that classify under B29C43, C08J5 or C08K7.
Because publication trails filing by roughly 18 months, the most recent year in the trend chart understates true filing activity; treat 2025 and 2026 as provisional floors, not final counts.
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Filing trend and technology composition
Two views of the same 118-record set: how filing has moved year over year, and which IPC subclasses carry the claim volume.
A peak in 2017, then a long flat tail
Filing hit its high point in 2017 at 10 records, dropped through the following years, and sat at just 2 records at the 2022 midpoint. The pattern reads as a technology whose core claim territory was staked out early, with later years adding incremental filings rather than a fresh wave.
Polymer chemistry dominates over base processing
C08J (polymer processing and solutions) and B29C (shaping of plastics) each appear in more than half of the 118 records — 61.9% and 55.1% respectively — showing that most filings combine a compounding or resin-chemistry claim with a molding-process claim. B29B, covering plastics preparation itself, appears in only 11.0% of records, a comparatively thin layer given how crowded the surface and additive chemistry classes are.
Shares are the percentage of the 118 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Sheet and Bulk Molding Compound Processing with Eureka
This page is one run against one query. Ask Eureka your own question about sheet and bulk molding compound processing and every answer comes back with the patent numbers behind it.
Try EurekaThe most-cited records in this space
US20250188260A1 — Recyclable sheet molding compound using liquid thermoplastic (meth)acrylic resin
A recyclable sheet molding composition for manufacture of a vehicle part, combining 20 to about 50% methacrylic thermoplastic resin, up to about 20% low-profile additive dissolved in monomer or polymeric resin, 20 to 60% reinforcement fibers, and a second filler at 10 to 40%.Filed by Magna Exteriors, published 2025-06-12 — one of the more recent records in scope and a useful marker of where active claim-drafting is happening now.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US4959189A | Process for forming a composite structure of thermoplastic polymer and sheet molding compound | 74 |
| 2 | US4532097A | Method of forming fiber reinforced synthetic material wheel | 65 |
| 3 | US5100935A | Flexible sheet molding compound and method of making the same | 54 |
| 4 | US6226958B1 | Insulated door assembly with low thermal deflection | 38 |
| 5 | US6001919A | Conductive sheet molding compound | 30 |
| 6 | US5932314A | Insulated door assembly with low thermal deflection | 30 |
| 7 | US20060258781A1 | Low-density molding compound | 28 |
| 8 | DE102006019686A1 | Use of carboxyl functional polyvinyl acetate solid resin as an additive in formulation for the production of … | 27 |
| 9 | US6740279B2 | Insulated door assembly with low thermal deflection | 27 |
| 10 | EP0361823A2 | A process for forming a composite structure of thermoplastic polymer and sheet molding compound | 27 |
Citation counts favor older filings simply because they have had longer to accumulate citations inside this corpus — read them as a signal of influence on later filers, not as a ranking of current relevance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the concentration and citation figures mean for a filing decision
Three figures from this dataset carry direct implications for anyone deciding where to file or who to watch.
The top of the field is genuinely concentrated
Five assignees hold 57 of the 118 records in scope — 48.3% of everything published. That is a narrow base for a field with 52 ranked companies overall, meaning most of the remaining filers hold only one or two records each. A freedom-to-operate review here should start with the leaders, not the long tail.
Activity has cooled since its 2017 peak
The peak year, 2017, produced 10 records; the 2022 midpoint produced only 2. Recent-year assignee data shows several previously active filers — including large composite and additive suppliers — recording zero filings in the latest year, consistent with a maturing claim landscape rather than a growing one.
Foundational structural claims still anchor the field
The most-cited record in scope, on composite/SMC structure formation, carries 74 citations — well ahead of the next-most-cited records. Newer filings, including the 2025 low-profile-additive record, build on this older structural base rather than displacing it.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to sheet and bulk molding compound processing, with the prior art for and against each one.
The ranked field and where new entrants can still find room
52 companies appear in the assignee ranking behind these 118 records. The distribution is top-heavy: the leader alone accounts for 15 records, the fifth-place assignee for 7, and the tenth-place assignee for 4 — a steep drop-off that leaves a long tail of single- and double-digit filers.
One filer sets the pace
The top-ranked assignee holds 15 of the 118 records, more than double the fifth-place holder's 7. That gap suggests a genuine first-mover advantage in core SMC/BMC compression-molding claims rather than a crowded multi-way race at the very top.
The middle of the ranking thins out fast
Between fifth place (7 records) and tenth place (4 records), the count nearly halves. Combined with the top 10 accounting for 70.3% of all 118 records, this confirms that meaningful patent activity is concentrated among a small set of repeat filers.
Cross-filing is limited but not absent
Only 10 co-assignee pairs appear across the dataset, the strongest linking a major resin supplier with an additive specialist on 6 shared records. Most assignees file independently, which is typical for a field where compounding chemistry and molding tooling can each be claimed alone.
| Assignee | Recent year | YoY |
|---|---|---|
| Edward G. Budd Manufacturing Co. | 0 | — |
| Magna Exteriors Inc. | 0 | — |
| Continental Structural Plastics Inc. | 0 | -100% |
| E.I. du Pont de Nemours & Co. | 0 | — |
| THERMA TRU CORP | 0 | — |
| AVERY INT CORP | 0 | — |
| Owens Corning Fiberglas Corporation | 0 | — |
| Polynt S.p.A. | 0 | — |
Where to take this analysis
The figures above describe the field as it stands; the next step is usually a narrower question specific to one product or process decision.
Map a specific claim against the leaders' portfolios
If a project touches low-profile additive chemistry or class A surface control, check it against the leading five assignees first — they hold nearly half of all records in scope.
Explore assignee portfolios in EurekaTrack whether filing is truly declining or just lagging
The 2025-2026 dip may partly reflect publication lag rather than a real slowdown; rerunning this search in twelve months will clarify which it is.
Set up a monitoring search in EurekaLook for recyclable-resin white space
The 2025 Magna filing on recyclable methacrylic SMC resin is one of few recent records addressing recyclability directly, suggesting room for further claims here.
Search recyclable SMC filings in EurekaCommon questions about SMC/BMC molding patents
Across the 118 records in this dataset, filing is concentrated among a small group: the top five assignees together hold 48.3% of all records, and the single leading assignee holds 15 records on its own. The ranking covers 52 companies in total, so most of the remaining filers appear only once or twice. Anyone doing freedom-to-operate work in this space should start with the leading five names rather than treating the field as evenly spread.
No — filing peaked in 2017 at 10 records and has trended flat to declining since, with the 2022 midpoint at just 2 records. Several previously active assignees show zero filings in the most recent year. Because publication lags filing by roughly 18 months, the very latest years will always look artificially low, but the multi-year trend before that lag effect is still a genuine slowdown, not just a data artifact.
Polymer processing and solutions (C08J) appear in 61.9% of the 118 records, and shaping of plastics (B29C) in 55.1%, meaning most filings pair a resin or compounding claim with a molding-process claim. Base plastics preparation (B29B) appears in only 11.0% of records, making it comparatively lightly claimed relative to the surface-finish and additive-chemistry literature that surrounds it.
This 2025 filing from Magna Exteriors claims a recyclable sheet molding composition built from 20 to about 50% methacrylic thermoplastic resin, up to about 20% low-profile additive dissolved in monomer or polymeric resin, 20 to 60% reinforcement fibers, and a second filler at 10 to 40%. It sits among the more recent records in scope and is one of the few addressing recyclable thermoplastic resin chemistry directly. Anyone formulating a similar recyclable SMC system should review its exact compositional ranges before finalizing a formulation in the same bands.
Based on the IPC composition of this dataset, base plastics preparation (B29B, 11.0% of records) and recyclable thermoplastic resin systems are comparatively thin compared with the dense literature around class A surface finish and low-profile additive chemistry. Fiber orientation prediction during flow is another area with fewer dedicated records relative to the broader compression-molding claim volume. These are starting points for a novelty search, not guarantees of clear white space.
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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.