Shape-Memory Alloy Durability Patents: Who Leads, Filing Trends 2026
- Filing has been declining since 2018. The peak year was 2018 at 530 filings; by the midpoint of 2022 the annual count had already fallen to 216, and 2026 (partial) sits at 29 — a flat-to-declining trend, not a growth story.
- Implants dominate the claim space. A61F (implants & prostheses) accounts for 3,943 of the records, nearly four times the next-largest subclass, meaning most durability claims are anchored to medical device form factors rather than the alloy itself.
- The most-cited prior art is decades old. The highest-cited records date back to the mid-2000s and concern heart valves and low-susceptibility devices, not corrosion or fatigue testing directly — citation weight here signals foundational device architecture, not current durability science.
Filing growth compares 2021 (367 records) with 2024 (222) — 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 9,884 records in scope (CR5), not by the ranked leaders only.
What this landscape covers
This dataset tracks patent families where shape-memory alloy or nitinol claims intersect with corrosion resistance, thermal cycling durability or functional fatigue language, spanning filings from 2015 through the mid-2026 data cut-off. The search string pulls both material-science filings and the medical devices built from these alloys, which is why the technology composition is so heavily weighted toward implants and surgical devices rather than metallurgy alone.
Because publication typically lags filing by around 18 months, the most recent one to two years in any trend chart will understate true filing activity — 2026's count of 29 is a partial year, not a cliff. Readers should treat the recent decline from the 2018 peak as directionally real but not yet fully resolved for the latest reporting years.
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Filing trends and technology composition
Two views of the same 9,884-family dataset: how filing volume has moved year over year, and which IPC subclasses carry the durability claims.
A peak in 2018, then sustained decline
Annual filings ran from 407 in 2017 to a peak of 530 in 2018, then eased to 216 by 2022 and down to 29 in the partial 2026 count. The shape is consistent with a technology area that filled its core claim space in the late 2010s rather than one still accelerating.
Implants and surgical devices carry the durability claims
A61F (implants & prostheses) leads with 3,943 records, followed by A61B (diagnosis & surgery) at 2,123 and A61M (body-fluid devices) at 1,263. The core metallurgy classes — C22C (alloys) at 671 and C23C (coating & surface deposition) at 317 — are comparatively thin, indicating that durability is mostly being claimed at the device level rather than the raw-alloy or coating level.
Shares are the percentage of the 9,884 records in scope. A patent can carry several IPC classes, so the shares add up to more than 100%.
Go deeper on Shape-Memory Alloy Environmental Durability with Eureka
This page is one run against one query. Ask Eureka your own question about shape-memory alloy environmental durability and every answer comes back with the patent numbers behind it.
Try EurekaRepresentative and most-cited records
Manufacture of shape memory alloy cellular materials and structures by transient-liquid reactive joining (US7896222B2)
Discloses a method using pure niobium as a transient-liquid reactive braze material to join Nitinol and related shape-memory and superelastic alloys into cellular or honeycomb structures, wire space-frames, or other built-up structures. Niobium liquefies at elevated temperature below its melting point and flows into capillary spaces between elements, enabling joining of corrugated sheet, discrete tubes or wires without conventional welding.Filed by Board of Trustees of Michigan State University, granted 2011-03-01.
| # | Publication no. | Patent title | Citations |
|---|---|---|---|
| 1 | US20070010702A1 | Medical device with low magnetic susceptibility | 1,509 |
| 2 | US20120123529A1 | Prosthetic heart valve | 1,492 |
| 3 | US20070207186A1 | Tear and abrasion resistant expanded material and reinforcement | 1,492 |
| 4 | US20060259137A1 | Minimally invasive valve replacement system | 1,426 |
| 5 | US7993394B2 | Low profile transcatheter heart valve | 1,389 |
| 6 | US7842025B2 | Dual-function catheter handle | 1,384 |
| 7 | US20080249608A1 | Bioabsorbable Polymer, Bioabsorbable Composite Stents | 1,178 |
| 8 | US20030023303A1 | Valvular prostheses having metal or pseudometallic construction and methods of manufacture | 1,060 |
| 9 | US20140163664A1 | Integrated system for the ballistic and nonballistic infixion and retrieval of implants with or without drug … | 963 |
| 10 | US6210408B1 | Guide wire system for RF recanalization of vascular blockages | 901 |
Citation counts reward older filings simply for having been in circulation longer; treat this table as a map of foundational device architecture, not a ranking of current technical importance.
Each row carries its publication number; clicking a row searches Eureka by that number.
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Browse MCP servers →What the numbers mean for a filing decision
Three patterns stand out once the raw counts are read against what they imply for someone deciding where to file next.
The core claim space filled early
Filing peaked in 2018 and has declined in most years since, with the 2022 midpoint already at less than half the peak. Dense filing in 2017-2019 means new entrants working on device-level durability claims are filing into occupied ground, not open territory.
Durability is claimed at the device, not the material
Implant and prosthesis claims outnumber core alloy claims nearly six to one. Coating and surface-deposition filings (C23C, 317) are thinner still, suggesting the underlying corrosion-resistance chemistry is comparatively under-claimed relative to the devices built around it.
Filing is US-centred with a strong EPO and PCT tail
The United States leads with 3,390 filings, ahead of Europe at 1,722 and WIPO/PCT at 884. Canada, Austria and Australia each sit in the 480-530 range, pointing to a filing strategy built around a US-first core plus a modest secondary-market layer rather than broad global coverage.
Eureka can read the same corpus for gaps instead of for coverage: under-claimed branches adjacent to shape-memory alloy environmental durability, with the prior art for and against each one.
Assignee activity and where it is heading
Recent-year momentum figures show declining or flat activity across the most visible names, consistent with the overall filing slowdown rather than a shift in leadership.
Even active filers are pulling back
Edwards Lifesciences recorded 5 filings in the latest year, down 76% year over year — the largest absolute activity among the tracked assignees but still a steep decline, reinforcing that this is a maturing claim space rather than one being actively contested.
Flat filing at the low end
Covidien LP shows 1 filing in the latest year with 0% year-over-year change — activity has stabilised at a minimal level rather than growing, a pattern shared by several other tracked assignees now filing at or near zero.
Collaboration is concentrated and Japan-centred
The strongest co-assignee relationship in this corpus links Furukawa Electric and Furukawa Techno Material at 45 joint filings, with a second Furukawa link to Tohoku University at 35 — collaboration here clusters around alloy manufacturing rather than the medical device side of the dataset.
| Assignee | Recent year | YoY |
|---|---|---|
| Edwards Lifesciences | 5 | -76% |
| Covidien LP | 1 | 0% |
| Biosense Webster (Israel) Ltd. | 0 | -100% |
| Cordis Corporation | 0 | — |
| Biosense Webster, Inc. | 0 | — |
| Silverbrook Research Pty Ltd | 0 | — |
| Advanced Bio Prosthetic Surfaces, Ltd. | 0 | — |
| Furukawa Electric Co., Ltd. | 0 | — |
Where to take this analysis
The dataset points toward specific next steps depending on whether the goal is freedom-to-operate, white-space filing, or competitive tracking.
Map claim scope on the thin subclasses
C22C and C23C carry far fewer records than the implant classes, but that thinness needs claim-by-claim verification before treating it as open space — a small number of broad early claims can still block a narrow area.
Explore claim scope in EurekaTrack the declining-filer group for expiry timing
Several assignees show 0% or steeply negative year-over-year momentum; for freedom-to-operate work, checking expiry and abandonment status on their older core patents may open routes that filing counts alone do not reveal.
Check portfolio status in EurekaWatch the Furukawa–Tohoku cluster
The strongest co-assignee links in this corpus sit around alloy manufacturing collaboration rather than device claims, a useful signal for anyone tracking where fundamental SMA material science is still being advanced jointly.
Trace collaboration networks in EurekaCommon questions on this landscape
No, not by the filing-volume evidence in this dataset. Annual filings peaked in 2018 at 530 and had already fallen to 216 by 2022, with the partial 2026 count at 29. Because publication lags filing by roughly 18 months, the very last one to two years will always look artificially low, but the multi-year trend from 2018 onward is a genuine decline rather than a data artefact.
The search terms combine shape-memory alloy or nitinol language with corrosion resistance, thermal cycling and functional fatigue claims, and the largest commercial application of nitinol's durability properties has been implantable and surgical devices. A61F (implants & prostheses) alone accounts for 3,943 of the 9,884 records, nearly six times the core alloy class C22C at 671, which reflects where the commercial claims concentrate rather than a bias in the search itself.
The thinnest IPC classes relative to the implant-heavy core are C23C (coating & surface deposition, 317 records) and C22C (alloys, 671 records), suggesting that corrosion-resistant coating chemistry and bulk alloy composition are comparatively under-claimed next to device-level applications. Non-medical structural uses of shape-memory alloys, such as joining methods for cellular or honeycomb structures, also appear thinly represented outside a handful of foundational filings.
Recent-year momentum data shows even the more active tracked assignees pulling back: Edwards Lifesciences recorded 5 filings in the latest year but that reflects a 76% year-over-year decline, and several other named assignees show flat or zero recent activity. This pattern across multiple assignees supports reading the field as consolidated and maturing rather than one with an actively expanding leader.
US7896222B2, assigned to the Board of Trustees of Michigan State University and granted in 2011, covers a transient-liquid reactive joining method using pure niobium braze to join Nitinol and related shape-memory alloys into cellular, honeycomb or wire space-frame structures. It is specific to the niobium transient-liquid mechanism and the resulting structure types described in its claims, so joining approaches using different braze chemistries or different structural outcomes would need individual claim-by-claim review rather than being assumed blocked outright.
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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.