Titanium Oxidation & Corrosion Resistance Patent Landscape
The titanium oxidation and corrosion resistance patent field is concentrated among Japanese and American specialty metals producers, with Nippon Steel Corporation holding the top position by a wide margin. The field has reached maturity — activity plateaued after a 2018 peak — but a six-percent recent-window uptick signals continued incremental investment rather than exit.
Japanese steel majors lead a concentrated but multi-polar field
Nippon Steel Corporation leads the ranking by a substantial margin, followed by Kobe Steel Ltd and Titanium Metals Corp in a closely packed second tier. The top five filers together account for 37 percent of the combined output of the hundred largest filers, indicating meaningful concentration without a single dominant monopoly.
The tier gap between the clear leader and the next two challengers is narrow in absolute terms — Kobe Steel and Titanium Metals Corp are essentially tied — suggesting that the second-tier positions remain genuinely contestable. Below rank five, player counts fall more steeply, reinforcing a two-tier structure: a small cluster of specialists and a long, fragmented tail.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Nippon Steel Corporation | 217 | |
| 2 | Kobe Steel Ltd | 137 | |
| 3 | Titanium Metals Corporation | 136 | |
| 4 | Sumitomo Metal Industries Ltd | 100 | |
| 5 | ATI Properties Inc | 88 | |
| 6 | NIPPON STEEL & SUMITOMO METAL CORP | 75 | |
| 7 | VSMPO-AVISMA Corporation | 55 | |
| 8 | JX NIPPON MINING & METALS CORP | 44 | |
| 9 | Daido Steel Co Ltd | 42 | |
| 10 | Nippon Kokan KK | 36 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | Yanshan University | 31 | |
| 12 | Citizen Watch Co Ltd | 31 | |
| 13 | Toyota Central R&D Labs Inc | 27 | |
| 14 | The Boeing Company | 27 | |
| 15 | Institute of Metal Research, Chinese Academy of Sciences | 27 | |
| 16 | NHK Spring Co Ltd | 23 | |
| 17 | Honda Motor Co Ltd | 21 | |
| 18 | Pulse IP LLC | 21 | |
| 19 | Mitsubishi Materials Corporation | 19 | |
| 20 | Toyota Motor Corporation | 19 |
The leaders’ positions reflect decades of alloy development and heat-treatment know-how, concentrated in IPC classes C22C (alloys) and C22F (non-ferrous metal treatment). New entrants seeking to challenge these incumbents must navigate an IP thicket built primarily around composition and thermomechanical processing routes.
Patent publications for 2024 and 2025 are still accumulating under normal publication lags, so activity in those years is under-counted and should not be read as a further decline. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
A 2018 filing peak followed by a plateau, with alloy composition dominating the technology mix
The annual trend and technology-composition charts together reveal a field that has defined its core technology routes and is now sustaining rather than expanding its frontier.
Annual filing trend
Filings spiked sharply to a 2018 peak then settled into a plateau range. The six-percent recent-window growth rate confirms ongoing but moderated activity. Years 2024 and 2025 are under-counted due to publication lag and should not be read as a structural decline.
↗ Hover for values · click a bar to ask EurekaTechnology composition
C22C (alloys) dominates by a wide margin, with C22F (non-ferrous metal treatment) a strong secondary branch. C23C (coating and surface deposition) is a meaningful but clearly subordinate third branch, pointing to surface engineering as a differentiation route that remains less saturated than bulk alloy composition.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Heat resistant titanium alloy material for exhaust…
A titanium alloy material for exhaust system parts which is excellent in oxidation resistance able to be used for an exhaust manifold, exhaust pipe, catalyst device, muffler, or other part characterized by containing, by mass %, Cu: 0.5 to 1.5%, Sn: 0.5 to 1.5%, Si: 0.1% to 0.6%, and O: 0.1% or less, a total of the contents of Cu and Sn being 1.4 to 2.7%… (excerpt from the patent abstract)
Open this patent in Eureka →| # | Patent | Citations |
|---|---|---|
| 1 | Surface hardened biocompatible metallic medical im… | 323 |
| 2 | Biocompatible low modulus titanium alloy for medic… | 216 |
| 3 | Surface and near surface hardened medical implants | 212 |
| 4 | Titanium alloy and method for producing the same | 196 |
| 5 | High strength, low modulus, ductile, biopcompatibl… | 167 |
| 6 | Surface hardened biocompatible metallic medical im… | 153 |
| 7 | Pseudoelastic beta titanium alloy and uses therefor | 131 |
| 8 | Method of surface hardening orthopedic implant dev… | 119 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the structure means for R&D investment decisions
Four structural reads — maturity, concentration, collaboration, and geography — converge to define the risk-reward profile for new entrants and incumbents alike.
Field at maturity: plateau after 2018 peak
Annual filings peaked in 2018 and have since plateaued, placing the field firmly in the maturity stage. The six-percent recent-window growth confirms the field has not gone into decline, but incremental alloy and treatment refinements now dominate over foundational invention. Entrants should expect high prior-art density in core C22C and C22F routes and plan for freedom-to-operate analysis before filing.
Lifecycle: MaturityTop-5 hold 37 percent of the top-100 filers’ output
The top five applicants — Nippon Steel, Kobe Steel, Titanium Metals Corp, Sumitomo Metal, and ATI Properties — jointly account for 37 percent of the combined output of the hundred largest filers. The second-tier positions are closely contested, making displacement possible through sustained filing campaigns in emerging sub-branches such as coating and additive manufacturing routes. Below rank five, the field becomes fragmented, offering niches for focused challengers.
Concentration: Moderate-HighCross-border co-filing concentrated between aerospace and materials partners
The most active co-filing pair is VSMPO-AVISMA (Russia’s leading titanium producer) and The Boeing Company, with 14 joint records — the strongest industrial partnership in the corpus. Nippon Steel and Nippon Steel & Sumitomo Metal Corp show 10 joint records, reflecting a merger-era transitional overlap. JX Nippon Mining & Metals Corp and Nippon Kokan KK co-filed on 8 records, and Daido Steel with Honda Motor Co on 6, indicating active automotive-sector collaboration. These pairings signal that aerospace and automotive end-markets drive the most structured R&D alliances.
Collaboration: ActiveChina is the top filing jurisdiction, ahead of Japan and the US
China leads all jurisdictions in patent-record volume, ahead of Japan and the United States, with Europe (EPO) and WIPO (PCT) providing additional protection layers for international families. The leading filers are predominantly Japanese and American corporations, meaning China is being used as a key protection market rather than as the primary source of IP creation. South Korea and Australia also appear, though at much lower volumes, rounding out a genuinely global protection footprint.
Geography: GlobalGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| VSMPO-AVISMA Corporation | The Boeing Company | 14 |
| Nippon Steel Corporation | NIPPON STEEL & SUMITOMO METAL CORP | 10 |
| JX Nippon Mining & Metals Corporation | Nippon Kokan KK | 8 |
| Daido Steel Co Ltd | Honda Motor Co Ltd | 6 |
| Kobe Steel Ltd | Citizen Watch Co Ltd | 4 |
| Kobe Steel Ltd | Natsuo Yukawa | 3 |
| Kobe Steel Ltd | Masahiko Morinaga | 3 |
| Nippon Steel Corporation | Suzuki Metal Industry Co Ltd | 2 |
| Nippon Steel Corporation | Furukawa Electric Co Ltd | 2 |
| Nippon Steel Corporation | Casio Computer Co Ltd | 2 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Nippon Steel leads; VSMPO-AVISMA and ATI show recent momentum
The leader board is shaped by vertically integrated metals producers with deep alloy composition and thermomechanical treatment portfolios. Momentum data reveals diverging trajectories: the incumbent leader has decelerated sharply, while two challengers are entering or accelerating.
Nippon Steel Corporation
Nippon Steel Corporation holds 217 patent records — the largest position in the corpus, nearly 60 percent larger than the nearest rival. Its technology emphasis is heavily concentrated in C22C 14 (titanium alloys by composition) and C22F 1 (non-ferrous metal treatment), with a smaller but notable position in C25D 11 (electroplating and electroforming). Recent momentum is sharply negative (trend: ▼ –90%), suggesting the company has shifted to harvesting its existing portfolio rather than extending it aggressively, which may open adjacencies for challengers.
patent records: 217VSMPO-AVISMA Corporation
VSMPO-AVISMA Corporation is a new entrant in the recent filing window (trend: ▲ new entrant), having accumulated 55 patent records overall. Its technical focus mirrors the field’s core — C22C 14 and C22F 1 — but it also shows activity in F01N 13 (exhaust and silencer treatment), pointing to aerospace propulsion applications. Its 14-record co-filing relationship with The Boeing Company is the strongest industrial collaboration in the dataset, giving it a strategic aerospace anchor that distinguishes it from purely materials-side incumbents.
patent records: 55| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Nippon Steel Corporation | 3 | ▼ -90% |
| ATI Properties Inc | 5 | ▲ new entrant |
| VSMPO-AVISMA Corporation | 12 | ▲ new entrant |
| Daido Steel Co Ltd | 2 | ▲ new entrant |
Under-served branches adjacent to the alloy core
The following IPC branches sit adjacent to the dominant C22C/C22F core but carry materially lower patent-record counts, making them worth examining for organizations seeking less-contested entry points.
H01M · Batteries, Cells & Fuel Cells
H01M holds 81 patent records, representing roughly 1 percent share among IPC branches in this corpus — sparse relative to the alloy and treatment core. Titanium’s electrochemical stability and corrosion resistance make it technically relevant for bipolar plates, current collectors, and electrode substrates in fuel cells and next-generation batteries. Given accelerating energy-transition investment, this adjacency has plausible commercial pull. Entry paths include combining existing C22F surface-treatment know-how with electrochemical performance claims, a route not heavily occupied by current leaders outside Nippon Steel & Sumitomo Metal Corp, which already shows H01M 8 in its focus.
Search this in Eureka →B22F · Powder Metallurgy
B22F carries 168 patent records — the largest of the lower-share branches but still representing only 3 percent share among IPC classes. Powder metallurgy and additive manufacturing (B33Y, also observed at 63 records) intersect here: titanium powder processing for near-net-shape corrosion-resistant components is a technically active but IP-sparse area relative to wrought alloy routes. The entry path is through process IP — sintering atmospheres, powder morphology, and post-print surface treatment — rather than competing head-on with incumbent composition patents.
Search this in Eureka →How leaders differ by technology route
Route coverage across the main technology branches in the current evidence set.
| Player | C22C 14 · Alloys | C22F 1 · Non-ferrous metal treatment | C22C 1 · Alloys | C23C 8 · Coating & surface deposition | A61L 27 · Sterilising & disinfecting |
|---|---|---|---|---|---|
| Nippon Steel Corporation | Strong · 160 | Strong · 110 | Absent | Emerging · 15 | Absent |
| Titanium Metals Corporation | Strong · 133 | Moderate · 64 | Emerging · 10 | Absent | Absent |
| Kobe Steel Ltd | Strong · 131 | Moderate · 49 | Absent | Emerging · 12 | Absent |
| ATI Properties Inc | Strong · 87 | Strong · 69 | Absent | Absent | Emerging · 8 |
| Nippon Steel & Sumitomo Metal Corporation | Strong · 93 | Strong · 61 | Absent | Absent | Absent |
| Sumitomo Metal Industries Ltd | Strong · 108 | Moderate · 37 | Absent | Absent | Absent |
| VSMPO-AVISMA Corporation | Strong · 52 | Moderate · 23 | Emerging · 8 | Absent | Absent |
Frequently asked questions
Nippon Steel Corporation leads with 217 patent records, followed by Kobe Steel Ltd (137), Titanium Metals Corp (136), Sumitomo Metal Industries Ltd (100), and ATI Properties Inc (88). All five are specialty metals producers with portfolios concentrated in alloy composition and thermomechanical treatment.
The field reached a 700-family corpus with a six-percent recent-window growth rate, but annual filings peaked in 2018 and have since plateaued. The lifecycle stage is classified as maturity. Note that 2024 and 2025 publication counts are under-accumulated due to normal filing-to-publication lag.
China is the top jurisdiction by patent-record volume, ahead of Japan, the United States, and Europe (EPO). WIPO (PCT) filings and a cluster of secondary jurisdictions including Canada, Australia, South Korea, and the United Kingdom reflect broad international protection strategies by the leading corporate filers.
C22C (alloys) and C22F (non-ferrous metal treatment) overwhelmingly dominate the IPC composition. C23C (coating and surface deposition) is a meaningful third branch. Smaller but potentially differentiated areas include B22F (powder metallurgy), H01M (batteries and fuel cells), and B33Y (additive manufacturing).
VSMPO-AVISMA Corporation and ATI Properties Inc are both classified as new entrants in the recent filing window — meaning their recent-period activity represents a step-change relative to their prior-period baseline. Daido Steel Co Ltd also shows a new-entrant trajectory. By contrast, Nippon Steel Corporation shows a sharp recent deceleration (▼ -90%), suggesting portfolio consolidation.
The highest-cited works in the corpus focus on surface-hardened biocompatible titanium medical implants (323 and 153 citations respectively), biocompatible low-modulus titanium alloys for medical use (216 citations), and surface and near-surface hardened implants (212 citations). A pseudoelastic beta titanium alloy and a high-strength low-modulus ductile biocompatible alloy also rank among the most-referenced works, pointing to medical-implant applications as a citation-intensive sub-field.
Built on Patsnap Open Platform
This report’s underlying patent dataset — filings, assignees, technology clusters — is open for developers via MCP and REST API. Free to start, 10,000 credits, no credit card required.
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.