Ladle Refractory Patents: Top Companies & Filing Trends 2026
Ladle Refractory and Slag Line Wear Patents
Concentrated but not locked up. the top 5 assignees hold 40.0% of the 75 records in scope, and the top 10 hold 58.7% — a leader plus a long tail, not a monopoly. Activity peaked so far at 5 records in 2022. With fewer than four complete years available once publication lag is stripped out, a growth rate cannot be stated reliably from this window.
- 1NIPPON STEEL CORPORATION10
- 2NUCOR CORP6
- 3PRAXAIR TECH INC6
- 4SUMITOMO METAL IND LTD5
- 5UNIV OF SCI & TECH BEIJING3
See the full ladle refractory and slag line wear analysis in Eureka
- The complete ranking, not just the top five
- Every IPC branch with its share of the corpus
- The most-cited records, and where claim space is still thin
Common questions on ladle refractory patents
Who holds the most patents in ladle refractory and slag line wear?
The dataset ranks 48 companies, with the leading assignee holding 10 of the 75 records in scope. The drop-off is steep at first — the fifth-ranked assignee holds only 3 — but flattens quickly, with the tenth-ranked assignee still holding 2. That pattern points to a field with one clear leader surrounded by a fragmented group of steelmakers, refractory specialists and research institutions rather than a small cartel of dominant filers.
What technology areas do most ladle refractory patents actually claim?
Most records sit in B22D, metal casting, which touches 62.7% of the 75 filings in scope — more than double the share in C04B, ceramics, cement and refractories, at 24.0%. F27D, furnace details and accessories, follows at 25.3%. This means the bulk of patent activity is claiming casting-integrated wear control and process steps around the ladle, not standalone refractory material chemistry, which is a narrower and comparatively less-crowded space.
Which countries see the most ladle refractory patent filings?
Japan is the largest receiving office in this dataset with 28 filings, ahead of the United States at 16 and China at 15. WIPO PCT filings account for 5, with Canada and India each at 3. A company assessing freedom-to-operate risk in this field should treat Japan as the primary jurisdiction to clear, not an afterthought behind the US and China.
Disclaimer. This analysis is based on Patsnap Eureka data drawn from a limited snapshot of global patent records and is provided for general information and reference only. Patent data carries inherent limitations — recent filings are under-counted because of publication lag, counts may be on a record or family basis, classification and applicant-name data may contain errors or duplicates, and the underlying search query defines the scope shown — so the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
Nothing here is an exhaustive prior-art, novelty, freedom-to-operate or validity search, nor does it constitute legal, financial or professional advice, and it should not be relied upon as such. Verify independently and review with qualified patent and legal professionals before acting on it.
Method: Filing trend and technology composition. Derived from a Patsnap search on Ladle Refractory and Slag Line Wear covering 2015–2026, data cut-off 2026-07-31. Counts reflect published records only and shift as new filings publish. Every share divides by all records in scope. Data: Patsnap Eureka. See the full landscape report.