Chiplet & Advanced Packaging Patents

Chiplet and advanced-packaging patents cover 2.5D interposer/bridge innovations; 3D-stacking and hybrid-bonding innovations; die-to-die interconnect innovations; and thermal, warpage, and test innovations — with IP held by the foundries, IDMs, OSATs, and equipment makers (in a field where packaging — not transistor scaling — increasingly drives performance, especially for AI). MAJOR CHIPLET / PACKAGING PATENT HOLDERS: TSMC: a deep advanced-packaging estate — CoWoS (Chip-on-Wafer-on-Substrate, a silicon interposer connecting logic + HBM memory — the dominant AI-GPU packaging, supply-constrained), InFO (Integrated Fan-Out), and SoIC (System-on-Integrated-Chips, 3D hybrid bonding); TSMC's packaging capacity gates the AI-chip supply chain. INTEL: Foveros (3D die stacking) and EMIB (Embedded Multi-die Interconnect Bridge — a silicon bridge embedded in the substrate, avoiding a full interposer), plus Foveros Direct (hybrid bonding). AMD: the chiplet PIONEER (disaggregating a CPU/GPU into multiple smaller dies for yield/cost) — 3D V-Cache (stacking cache via hybrid bonding) and Infinity Fabric die-to-die interconnect. OTHERS: Samsung (X-Cube 3D, I-Cube 2.5D), ASE and Amkor (OSAT assembly/test — packaging-process IP), Broadcom, NVIDIA (designs around CoWoS), and equipment makers Besi/Applied Materials/EVG (hybrid-bonding tools). 2.5D/3D integration, hybrid bonding, and die-to-die interconnect are the core chiplet patent domains — and AI/HPC bandwidth demand drives the value.

Silicon-interposer innovations; embedded-bridge innovations; 3D-stacking and through-silicon-via innovations; and fan-out and substrate innovations represent core advanced-packaging patent domains — and how multiple dies are connected with high bandwidth in a small space is the central challenge. 2.5D INTERPOSER PATENTS: a silicon (or organic/glass) interposer carrying fine-pitch wiring that connects multiple dies side-by-side (logic + HBM stacks — TSMC CoWoS), interposer fabrication, redistribution layers, and large-interposer/reticle-stitching (AI accelerators need interposers larger than a single reticle); glass-substrate interposers are an emerging area. EMBEDDED-BRIDGE PATENTS: a small silicon bridge embedded in the package substrate to connect adjacent dies WITHOUT a full interposer (Intel EMIB) — bridge design, embedding process, and the cost/scalability advantage. 3D-STACKING / TSV PATENTS: stacking dies vertically with through-silicon vias TSVs (vertical electrical connections through a thinned die), TSV fabrication, wafer thinning, and stacked-die architecture (Foveros, SoIC, 3D V-Cache); 3D stacking gives the shortest interconnect and highest density. FAN-OUT PATENTS: integrated fan-out (InFO — redistributing die I/O onto a larger area without a substrate), and panel-level fan-out for cost. SUBSTRATE PATENTS: high-density organic and glass substrates, and substrate warpage control. Large/reticle-stitched interposers (for AI), embedded bridges, and 3D TSV stacking are the highest-value 2.5D/3D IP because AI accelerators are bottlenecked by die-to-memory bandwidth and integration density.

Hybrid-bonding innovations; die-to-die-interconnect and standard innovations; thermal and warpage innovations; and known-good-die and test innovations represent additional chiplet patent domains — and hybrid bonding (the highest-density connection) plus die-to-die interfaces are the frontier. HYBRID-BONDING PATENTS: copper-to-copper (Cu-Cu) HYBRID BONDING — directly bonding two dies/wafers with sub-micron-pitch copper pads and dielectric (no solder bumps — the highest interconnect density, enabling 3D stacking like AMD 3D V-Cache and TSMC SoIC) — surface preparation, alignment, bonding process, dielectric, and die-to-wafer vs wafer-to-wafer bonding (this is the key enabling technology and a dense, valuable patent area, with equipment makers Besi/Applied also holding IP). DIE-TO-DIE INTERCONNECT PATENTS: the physical-layer interface connecting chiplets — UCIe (Universal Chiplet Interconnect Express, the industry standard for chiplet interoperability), Bunch-of-Wires BoW, and proprietary die-to-die PHYs (AMD Infinity Fabric, Intel AIB) — PHY design, signaling, and the standard-compliant interface (interoperability via UCIe is a market requirement). THERMAL / WARPAGE PATENTS: removing heat from stacked/dense packages (3D stacking traps heat — a major constraint), thermal interface materials, integrated cooling, and warpage/stress management across large packages. KNOWN-GOOD-DIE / TEST PATENTS: testing chiplets before assembly (a known-good-die is essential — assembling a bad chiplet ruins an expensive package), and post-assembly test. Cu-Cu hybrid bonding (process and equipment), UCIe-compliant die-to-die PHYs, and thermal management for 3D stacks are the highest-value frontier chiplet IP.

Chiplet/packaging startup IP strategy must navigate TSMC's CoWoS/SoIC and Intel's Foveros/EMIB and AMD's chiplet estates, OSAT (ASE/Amkor) process IP, hybrid-bonding equipment-maker patents (Besi/Applied/EVG), the capital intensity and foundry/OSAT-dependent nature of packaging, UCIe and interoperability standards, and a landscape where AI/HPC bandwidth demand makes packaging a bottleneck and a value center; understand that the major integration schemes (CoWoS, Foveros, EMIB) are foundationally held by foundries/IDMs, so a startup's durable IP is usually in a specific hybrid-bonding/process innovation, a die-to-die PHY/UCIe implementation, thermal management, glass-substrate or panel-level techniques, or test, and that foundry/OSAT partnerships and capital matter as much as patents; identify whitespace in hybrid bonding, die-to-die PHYs, thermal, glass substrates, and test. CHIPLET-PACKAGING STARTUP IP STRATEGY: MAJOR INTEGRATION SCHEMES ARE FOUNDRY-HELD — HYBRID BONDING, PHYs, THERMAL, AND PROCESS ARE THE STARTUP IP: CoWoS/Foveros/EMIB are foundationally held by TSMC/Intel/AMD — patent a specific hybrid-bonding/process innovation, a die-to-die PHY/UCIe implementation, thermal management, glass-substrate/panel-level technique, or known-good-die test; HYBRID BONDING IS HIGHEST-VALUE WHITESPACE: Cu-Cu hybrid bonding (sub-micron pitch, the enabler of dense 3D stacking) is the frontier — process, surface-prep, alignment, and equipment innovations are valuable (and equipment makers Besi/Applied hold IP, so map FTO); DIE-TO-DIE PHYs AND UCIe IMPLEMENTATIONS ARE PATENTABLE: an efficient, standard-compliant chiplet interface (UCIe PHY) is a defensible, valuable component as the industry standardizes; THERMAL MANAGEMENT FOR 3D STACKS IS A GATING PROBLEM: dense 3D packages trap heat — thermal-interface, integrated-cooling, and stack-thermal designs are high-value (see also data-center cooling); GLASS SUBSTRATES AND PANEL-LEVEL FAN-OUT ARE EMERGING: glass interposers/substrates and panel-level packaging for cost/scale are open areas; FOUNDRY/OSAT PARTNERSHIPS AND CAPITAL ARE PARALLEL MOATS: packaging is capital- and partner-intensive — IP without manufacturing access is incomplete; WHEN TO PATENT: NOVEL PROCESS/COMPONENT WITH MEASURED PERFORMANCE: file once a technique shows measured results (interconnect pitch/density + bandwidth + bonding yield/alignment + thermal performance + cost) vs. CoWoS/Foveros/hybrid-bonding baselines — measured interconnect density, bandwidth, yield, and thermal performance are the critical chiplet-packaging IP metrics; KEY FTO CHECKLIST: TSMC CoWoS interposer + InFO fan-out + SoIC 3D hybrid bonding; Intel Foveros 3D + EMIB embedded bridge + Foveros Direct hybrid bonding; AMD chiplet + 3D V-Cache + Infinity Fabric die-to-die; Samsung X-Cube/I-Cube; ASE/Amkor OSAT assembly/test; Cu-Cu hybrid bonding surface-prep/alignment (Besi/Applied/EVG equipment FTO); TSV through-silicon via wafer-thinning; UCIe/BoW die-to-die PHY; reticle-stitched/large interposer; glass substrate/panel-level fan-out; 3D-stack thermal/warpage; known-good-die test.