2Xxx Aluminum Lithium Alloys
Patent No. EP3877562 (titled "2Xxx Aluminum Lithium Alloys") was filed by Arconic on Nov 6, 2019. The application was issued on Apr 2, 2025.
Patent Summary
A 2xxx aluminum alloy comprises 2.5–3.9 wt.% Cu, 0.82–1.20 wt.% Li, 0.75–2.0 wt.% Zn, 0.10–0.60 wt.% Mn, and 0.05–0.35 wt.% Mg. It includes 0.05–0.50 wt.% of at least one grain structure control element selected from Zr, Sc, Cr, V, Hf, other rare earth elements, or combinations thereof. Additional limits include up to 0.22 wt.% Ag, 0.15 wt.% Fe, 0.12 wt.% Si, 0.15 wt.% Ti, 0.05 wt.% total Ca and Sr, and 20 ppm Be. The balance is aluminum and impurities, with total impurities limited to 0.15 wt.% and any single impurity not exceeding 0.05 wt.%. The alloy is designed for improved strength, toughness, corrosion resistance, and fatigue crack growth resistance, specifically providing stress corrosion cracking resistance in T8 temper for products with thicknesses of at least 80 mm.
Patent Family
Patent Oppositions
Patent oppositions filed by competitors challenge the validity of a granted patent. These oppositions are typically based on claims of prior art, lack of novelty, or non-obviousness. They are a key part of the process for determining a patent's strength and enforceability.
Dossier Documents
The dossier documents provide a comprehensive record of the patent's prosecution history - including filings, correspondence, and decisions made by patent offices - and are crucial for understanding the patent's legal journey and any challenges it may have faced during examination.
Date
Description
EP3877562
- Application Number
- EP19882996A
- Filing Date
- Nov 6, 2019
- Status
- Granted And Under Opposition
- Feb 28, 2025
- Publication Date
- Apr 2, 2025
- External Links
- Slate, Register , Google Patents