Phenolic Resin Patents: Who Leads as Filings Plateau 2026
- Filings have cooled since 2019. the peak year in the dataset, with the 2026 count still partial and running well below the 2022 midpoint of 120.
- Claim activity spreads across eight IPC subclasses, with polymer composition (C08L) and additive use (C08K) dominant while friction materials (F16D) and laminates (B32B) carry a much thinner but still active footprint.
- Momentum has stalled even among the largest holders, several of the most-cited assignees recorded zero filings in the most recent year, a signal worth checking before assuming they still lead.
Filing growth compares 2021 (165 records) with 2024 (140) — 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 7,942 records in scope (CR5), not by the ranked leaders only.
What this dataset covers
This landscape draws on 7,942 patent families published between 2015 and mid-2026 that claim phenolic resin, novolac, resole or phenol formaldehyde resin compositions alongside curing agents, hexamethylenetetramine, molding compounds, thermal stability, friction materials or molar-ratio control. The search is anchored to IPC classes C08G8 (phenolic condensation polymers), C08L61 (phenolic polymer compositions) and C08J5 (shaped articles and layered products), so it captures both the base chemistry and its downstream molding and laminate applications.
Filing activity is concentrated in Japan and China, with the United States, Europe, the United Kingdom and Canada making up a smaller but still meaningful share of receiving offices. Because publication typically lags filing by around 18 months, the 2025 and 2026 counts in the trend chart understate actual filing activity for those years.
Filing trend and technology composition
Annual filing counts and IPC distribution across the corpus, based on 7,942 published families.
A decade of filings that peaked and then eased off
Filings rose from 206 in 2017 to a peak of 213 in 2019, held near 120 by the 2022 midpoint, and have since declined to 35 in the partial 2026 count. That shape reads as a mature filing base rather than an emerging one: claim space around core novolac and resole chemistry was staked out earlier in the window, and recent activity looks more like defensive refinement than a land grab.
Composition claims dominate, but application-specific classes persist
C08L (polymer compositions) and C08K (additives) together account for the bulk of records, with C08G (condensation polymers) close behind — expected for a chemistry defined by its base resin and its modifiers. F16D (clutches and brakes), B32B (laminates), C09K and C09J (adhesives) are smaller but non-trivial, marking where phenolic resin chemistry meets specific end uses like friction materials and layered composites.
Shares are the percentage of the 7,942 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Phenolic Resin Technology Landscape (Novolac & Resole) with Eureka
This page is one run against one query. Ask Eureka your own question about phenolic resin technology landscape (novolac & resole) and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative filing and most-cited records
US9228084B2 — Phenolic resin molding compound (Sumitomo Bakelite)
A phenolic resin molding compound includes (A) a novolac-type phenolic resin including an alkylbenzene-modified novolac-type phenolic resin, (B) a resol-type phenolic resin, (C) hexamethylenetetramine, (D) graphite, and (E) fiber-shaped filler, wherein in regard to the content of each component on the basis of the entirety of the molding compound, a total content of the components (A) to (C) is 30 to 40% by weight, a content of the component (D) is 30 to 50% by weight, and a content of the component (E) is 5 to 20% by weight.Filed by Sumitomo Bakelite, published 2016-01-05.
View full record| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | JP2009035682A | Rubber composition for tire bead filler | 558 |
| 2 | US6207786B1 | Ternary systems of benzoxazine, epoxy, and phenolic resins | 267 |
| 3 | US5218038A | Phenolic resin coated proppants with reduced hydraulic fluid interaction | 244 |
| 4 | US3676392A | Resin compositions | 198 |
| 5 | US4918116A | High temperature resistant molding materials | 178 |
| 6 | US5736619A | Phenolic resin compositions with improved impact resistance | 166 |
| 7 | US5864003A | Thermosetting phenolic resin composition | 159 |
| 8 | US4268425A | Phenolic resin-polyisocyanate binder systems containing a drying oil and use thereof | 141 |
| 9 | JP2012246367A | Thermosetting resin composition, cured product thereof, semiconductor sealing material, prepreg, circuit boar… | 140 |
| 10 | US5670585A | Use of polyacrylic acid and other polymers as additives in fiberglass formaldehyde based binders | 137 |
Citation counts favour older filings simply by virtue of being searchable longer; treat them as a measure of influence on the field, not 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 filing pattern tells you
Three read-throughs from the trend, citation and co-filing data that matter for anyone deciding where to file or search next.
The core chemistry is well-trodden ground
A peak in 2019 followed by a steady decline to a partial count of 35 in 2026 suggests the fundamental novolac and resole formulation space has been substantially claimed. New entrants are more likely to find open ground in application-specific formulations than in base resin chemistry itself.
Influence concentrates in application patents, not base resin claims
The most-cited record in the corpus covers a tire bead filler rubber composition rather than a novolac or resole synthesis method, and several other heavily cited records address proppant coating and high-temperature molding. Influence in this field has tracked specific end-use formulations more than the underlying resin chemistry.
Collaboration is limited and clusters around a few relationships
Only ten co-assignee pairs appear in the dataset, and the strongest involves 18 shared filings between two chemical suppliers. Most of the corpus is filed by single assignees, meaning cross-licensing or joint-development signals are the exception rather than the norm here.
Historical leaders are not necessarily current leaders
Several of the assignees with the deepest filing histories, including major Japanese resin and electronics suppliers, show zero filings in the most recent year captured. That does not mean they have exited the space — publication lag makes the newest year unreliable — but it means ranking by cumulative count alone can mislead on who is actually active now.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to phenolic resin technology landscape (novolac & resole), with the prior art for and against each one.
Assignee landscape and where claim density is thin
Filing activity concentrates among a small group of established resin and molding compound manufacturers, mostly Japanese, with a long tail of single or few-filing entrants.
Filing is anchored in Japan and China
Japan and China together account for the largest share of receiving-office filings, well ahead of the United States, Europe, the United Kingdom and Canada. That pattern reflects where phenolic resin manufacturing and downstream molding-compound production is concentrated.
A small number of supplier relationships stand out
The strongest co-assignee pairing links two chemical suppliers with 18 shared filings; other notable pairs connect a molding compound maker with an automotive component supplier and an electronics manufacturer. These relationships are visible but not widespread across the dataset.
Recent activity has gone quiet across the board
None of the assignees with the strongest historical filing records show activity in the most recent year of the dataset. Combined with the overall decline from the 2019 peak, this points to a field where the largest players are consolidating existing claims rather than expanding them.
| Assignee | Recent year | YoY |
|---|---|---|
| Sumitomo Bakelite Co., Ltd. | 0 | — |
| Resonac Corporation | 0 | — |
| Matsushita Electric Works, Ltd. | 0 | — |
| DIC Corporation | 0 | — |
| Borden Chemical, Inc. | 0 | — |
| Borden, Inc. | 0 | — |
| Mitsui Chemicals, Inc. | 0 | — |
| Asahi Organic Chemicals Industry Co., Ltd. | 0 | -100% |
Where to take this analysis
The dataset points to a mature core chemistry with narrower openings in application-specific formulations. These next steps help turn that read into a filing or freedom-to-operate decision.
Map claims against the under-claimed branches
Cross-check any planned formulation against the friction-material, adhesive-laminate and low-formaldehyde curing agent branches identified above before drafting new claims.
Explore white space in EurekaVerify current assignee activity, not just historical rank
Several top-cited assignees show no recent filings; confirm whether that reflects a real pullback or simply publication lag before treating them as inactive.
Run an assignee monitor in EurekaReview the most-cited records for design-around risk
The highest-citation records concentrate in specific end-use applications like tire components and proppant coatings — read these closely if your formulation touches those areas.
Pull full-text citations in EurekaCommon questions about phenolic resin patents
This dataset identifies 7,942 patent families published between 2015 and mid-2026 that combine phenolic resin, novolac, resole or phenol formaldehyde resin chemistry with curing agents, molding compounds, thermal stability or friction-material applications. The true worldwide total is larger, since this search is scoped to a specific IPC and keyword combination rather than every possible phenolic resin filing. Family counts are the more reliable unit here than raw document counts, since they strip out duplicate filings of the same invention across jurisdictions.
Filings peaked in 2019 at 213 and have declined since, sitting at 120 by the 2022 midpoint and falling further to a partial count of 35 in 2026. This is a flat-to-declining trend rather than a growth curve, consistent with a chemistry whose core composition space has been substantially claimed over the past decade. Keep in mind that the most recent one to two years are always undercounted because publication typically lags filing by around 18 months.
Filing activity concentrates among a small group of established Japanese resin and molding-compound manufacturers, alongside chemical suppliers active in co-filed patents. Several of the assignees with the largest historical filing counts, however, show zero filings in the most recent year captured in this dataset, so cumulative rank does not necessarily reflect who is actively filing today. Anyone assessing competitive position should check recent-year activity separately from all-time totals.
US9228084B2, assigned to Sumitomo Bakelite, claims a phenolic resin molding compound combining a novolac-type resin, a resole-type resin and hexamethylenetetramine within defined weight-percentage ranges, plus graphite and fiber-shaped filler in specified proportions. It blocks formulations that fall within those specific compositional ranges and component combinations, not phenolic molding compounds generally. A formulation using different filler types, a different curing agent, or weight ratios outside the claimed 30-40%/30-50%/5-20% bands would likely sit outside its claim scope, though a full freedom-to-operate review should check dependent claims and file history too.
The IPC composition data shows heavy density in polymer composition (C08L), additive use (C08K) and condensation polymer (C08G) classes, but comparatively thinner activity in friction-material-specific blends, adhesive-laminate interfaces, and low-free-formaldehyde curing agent alternatives to hexamine. These are areas where the base chemistry claim space is crowded but the application-specific engineering around it is less saturated. That said, thinner filing density signals room to file, not necessarily that the technical problem is easy to solve.
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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.