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.

“Some embodiments of the invention provide a three-dimensional (3D) circuit that is formed by stacking two or more integrated circuit (IC) dies to at least partially overlap and to share one or more interconnect layers that distribute power, clock and/or data-bus signals.”— U.S. Patent No. 11,881,454 source

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.