When two dies stack and bond face-to-face, their top metal layers meet, and how those layers are oriented affects whether the cross-die wiring routes cleanly or creates congestion at the bond interface. Adeia's 2024 grant claims arranging the interconnect layers orthogonally - perpendicular - to ease that routing.
The grant US11881454B2 (issued January 23, 2024; Adeia Semiconductor Inc.; CPC H01L 25/0657 stacked-die assembly, H01L 24/08 bond structures, H01L 24/16 bumps, H01L 27/0688 integrated structure) claims a stacked IC structure with orthogonal interconnect layers. The bonding and stacked-die codes place it in the hybrid-bonding family.
Why orthogonal? Think of two grids of wires meeting at a boundary. If both run the same direction, connections between them are constrained and crowded; if one runs north-south and the other east-west, any point on one grid can reach across to the other with a simple via, and the routing opens up. Perpendicular layers are a routing-freedom trick.
Adeia's business model sharpens the relevance. Adeia (formerly Xperi/Invensas) is an IP-licensing company with a deep hybrid-bonding portfolio that it licenses to manufacturers across the industry. A clean, fundamental structural claim like orthogonal interconnect layers is exactly the kind of broadly applicable IP that anchors a licensing program.
This sits in the dense hybrid-bonding thicket with TSMC, Intel, Broadcom, and others, but from a pure-IP vantage. Where foundries claim bonding to support their own products, a licensor like Adeia claims structures meant to be used by many - which can make its claims especially load-bearing across the sector.
For the claim reader, the discipline is to see how a simple geometric idea - perpendicular wiring - becomes a defensible structural claim when applied to stacked, bonded dies. Adeia's 2024 grant is a clean example: the limitation is the orthogonality, and the value is how broadly that limitation reads across hybrid-bonded designs.