Intel Corporation's answer to the silicon interposer is EMIB - an Embedded Multi-die Interconnect Bridge, a small piece of silicon buried in the package substrate that provides dense routing only where two dies meet, leaving the rest of the package cheap. A late-2024 grant extends this with a composite-bridge design.
US12142570B2, "Composite bridge die-to-die interconnects for integrated-circuit packages" (issued 2024-11-12), is classified in H01L 23/5384 (internal connections/bridges) with H01L 24/11/16 (bumps), H01L 25/0652/0655, and H01L 25/50. The claim is on a composite bridge - the limitation being the combination of materials or structural layers that distinguishes it from a plain silicon bridge.
Construe what 'composite' requires. A standard EMIB bridge is a silicon die with dense wiring. A composite bridge combines elements - perhaps multiple material layers, or silicon plus another medium - to improve cost, routing density, or thermomechanical behavior. The claim's value is in that specific composition, and the independent claim defines which combination is fenced.
The design-around space is the bridge construction. A competitor using a monolithic silicon bridge (classic EMIB), a TSMC CoWoS-L reconstituted bridge, or an organic bridge reaches die-to-die connection by a different structure. The composite aspect is precisely what this claim adds beyond the embedded-bridge baseline.
Intel's broader die-to-die portfolio is deep - the same 2024 facet data shows Intel dominating the chiplet-interconnect class, with grants like its PHY-less die-to-die I/O solution (US12159840B2) and multi-die bridge fabrication. Intel treats packaging as a competitive weapon in its IDM and foundry strategy, and the bridge IP is core to that.
For competitive intelligence, the EMIB-versus-interposer contest is one of the defining packaging rivalries, and Intel's composite-bridge claims raise the cost of copying its specific approach. Anyone building an embedded-bridge package - and the UCIe standard encourages more of them - should read Intel's bridge family to understand which constructions are fenced.