Al-Li Alloy Corrosion Resistance Patent Snapshot 2026
The Al-Li alloy corrosion resistance patent space is a compact, mature field dominated by a small group of North American aluminum producers and aerospace primes, with Europe (EPO) as the leading filing jurisdiction. Annual activity has plateaued near its 2018 peak, signaling a field in late-stage consolidation rather than early-stage growth.
Kaiser Aluminum leads a tightly held field concentrated among established materials producers
Kaiser Aluminum Fabricated Products LLC holds the top position, followed closely by Alcoa Inc and. The Boeing Co. Together, the top five filers account for 47% of the combined total among the ranked applicants visible in this query, indicating a highly concentrated visible assignee structure.
The gap between the first and second tier is narrow in absolute terms — Kaiser Aluminum at 17 patent records versus Alcoa at 16 and Boeing at 13 — suggesting that no single player has achieved a commanding lead, but entry by new actors remains limited.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | Kaiser Aluminum Fabricated Products LLC | 17 | |
| 2 | Alcoa Inc | 16 | |
| 3 | The Boeing Co | 13 | |
| 4 | Pechiney Rolled Products LLC | 9 | |
| 5 | Constellium Rolled Products Ravenswood LLC | 7 | |
| 6 | Reynolds Metals Co | 6 | |
| 7 | Martin Marietta Corp | 4 | |
| 8 | Shanghai Jiao Tong University | 4 | |
| 9 | Aluminum Company of America | 3 | |
| 10 | Honeywell International Inc | 3 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | AVIC Beijing Institute of Aeronautical Materials | 3 | |
| 12 | McCook Metals LLC | 3 | |
| 13 | Arishiumu | 2 | |
| 14 | Lockheed Martin Corp | 2 | |
| 15 | Lin Jen C | 2 | |
| 16 | NANJING UNIV OF AERONAUTICS & ASTRONAUTICS | 2 | |
| 17 | Daech Alfred Fr | 2 | |
| 18 | Newman John M | 2 | |
| 19 | Central South University | 2 | |
| 20 | CHONGQING UNIV OF ARTS & SCI | 2 |
The dominance of integrated aluminum producers (Kaiser, Alcoa, Reynolds Metals, Pechiney, Constellium) alongside aerospace end-users (Boeing, Lockheed Martin) implies that corrosion-resistance IP is primarily a materials-process asset, developed close to the alloy supply chain rather than at system integration level.
Patent records published within approximately the last 18–24 months are subject to publication lag and likely under-represent the most recent filing activity. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Filing activity peaked in 2018 and has since plateaued; alloy composition and heat treatment dominate the technology mix
The annual filing chart and technology composition chart together show both the pace and the character of innovation: a field that surged around 2018 and has since settled into a steady but modest cadence, with effort concentrated in alloy formulation and thermal processing.
Annual filing trend
Filings peaked at 7 records in 2018, then fell and stabilized in the 1–4 range from 2019 onward. The 2026 value of zero should be read as an artifact of publication lag rather than a cessation of activity. The overall multi-year picture is one of plateau, consistent with a mature field.
↗ Hover for values · click a bar to ask EurekaTechnology composition
C22C (Alloys) and C22F (Non-ferrous metal treatment) together account for the large majority of IPC-tagged records, confirming that composition design and thermal/mechanical treatment are the core technical battlegrounds. Downstream process branches — casting (B22D), welding (B23K), extrusion (B21C) — each carry far fewer records, pointing to relative sparsity outside the alloy-and-treatment core.
↗ 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.
Mechanically alloyed dispersion strengthened alumi…
A dispersion-strengthened aluminum-base alloy system is provided which is prepared by mechanical alloying and is characterized by high strength, high elastic modulus, low density and high corrosion resistance. The alloy system is comprised, by weight, of at least above 1.5% up to about 3% Li, about 0.4% up to about 1.5% O, about 0.25% up to about 1.2% C… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Low density high strength Al-Li alloy | 109 |
| 2 | Process for producing duplex mode recrystallized h… | 75 |
| 3 | Aluminum alloy two-step aging method and article | 56 |
| 4 | 一种改善铝锂合金耐腐蚀性能的热处理工艺 | 48 |
| 5 | Low density, high strength Al-Li alloy having high… | 45 |
| 6 | Method of improving fracture toughness in aluminum… | 31 |
| 7 | Aluminum-lithium alloy products and method of maki… | 29 |
| 8 | Aluminium base copper-lithium-magnesium welding al… | 28 |
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.
Assignee snapshot from the current evidence set
The applicants below are visible in this query result. Because the evidence set is relatively small, read this section as a directional snapshot rather than a full competitive ranking.
Kaiser Aluminum Fabricated Products LLC
Kaiser Aluminum holds the top-ranked position with 17 patent records, concentrated in alloy composition (C22C 21) and non-ferrous metal treatment (C22F 1), with a minor presence in metal rolling (B21B 3). No recent momentum entry is flagged for Kaiser in the evidence, consistent with an established, mature portfolio rather than an accelerating program.
patent records: 17Alcoa Inc
Alcoa Inc ranks second with 16 patent records and a notably broader technology footprint than Kaiser, spanning alloy composition (C22C 21), casting (B22D 21), and solar heat collectors (F24S 23) — the last being an unusual adjacent branch. This breadth may reflect legacy filings across diverse application domains. No recent momentum trend is separately flagged for Alcoa in the evidence.
patent records: 16Frequently asked questions
The evidence corpus contains 29 patent families in scope for Al-Li alloy corrosion resistance across the analyzed period.
Kaiser Aluminum Fabricated Products LLC leads with 17 patent records, narrowly ahead of Alcoa Inc at 16 and The Boeing Co at 13.
Europe (EPO) is the leading jurisdiction by patent record count, followed by China and the United States. Canada and Japan also appear as significant filing destinations.
The field is in a Maturity stage. Annual filings peaked in 2018 and have since plateaued, with zero net recent growth. The 2026 record count should be treated as incomplete due to publication lag.
C22C (Alloys) and C22F (Non-ferrous metal treatment) are the visible branches. B23K (Welding, soldering and brazing) and C23C (Coating and surface deposition) each carry only 1–2 patent records, making them relatively sparse adjacent branches.
The evidence identifies one documented co-filing partnership: Reynolds Metals Co and Martin Marietta Corp, with 4 joint filings. No other co-applicant relationships are recorded in the evidence.
Ready to map your own Al-Li corrosion resistance Snapshot?
Join 18,000+ innovators using PatSnap Eureka to map any technology landscape: search 2B+ patents and papers, surface key assignees, and generate a report like this in minutes.
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.