Heat-flux-map-registered zone-modulated thermal interface material for AI accelerator packaging

This invention is a single continuous thermal interface material body whose in-plane filler-volume-fraction field phi(x,y) is registered to the die heat-flux map q(x,y), concentrating filler precisely where flux is highest while keeping the total filler inventory within plus or minus 5 percent of a matched uniform control. The result is a modeled hotspot peak-temperature reduction of 10 to 25 K — delivered without increasing filler mass or changing filler chemistry. That combination is commercially significant: premium fillers such as hexagonal boron nitride and aluminum nitride already dominate the bill of materials for high-power thermal interface layers, so any improvement that acts within the same mass budget rather than requiring more of an expensive commodity is immediately attractive to cost-sensitive packaging engineers. The timing is structural, not cyclical. The transition to glass-core substrates and continuously rising thermal design power in AI accelerators is compressing the thermal budget at TIM-1 right now. Sustained clock speeds on packages such as NVIDIA Blackwell B200 and AMD MI300X are constrained by hotspot peak temperature, not by average interface conductance. A configuration-level innovation that addresses the hotspot directly — without reformulating chemistry or adding hardware — can be adopted atop an already-qualified filler system under license, which substantially lowers the switching cost for any packaging program already committed to an incumbent material. The claim is configuration-novelty rather than new-material novelty, meaning it reads across diverse matrix chemistries and filler sources. A buyer licenses not a specific compound but the spatial-design principle, and can therefore apply it to their existing qualified material. That makes this a foundational license for any high-power IC packaging program rather than a point feature that expires with a single product generation.

This is a zone-modulated polymer or dynamic-network composite TIM — there is no single molecular formula, crystal space group, or bandgap, because the invention is a spatial configuration over conventional matrices and fillers, not a new crystalline phase. The key engineered parameter is the local filler volume fraction phi(x,y), which is mapped continuously to the die heat-flux distribution q(x,y) acquired from thermal simulation or infrared characterization. Where flux is high, filler fraction is high; where flux is low, filler fraction is pulled back. The thermal resistance at any point scales inversely with local effective conductivity, which tracks filler loading through well-established effective-medium relations. Concentrating filler at the hotspot therefore lowers junction peak temperature far more efficiently than uniform loading at the same average filler mass. The design constraint — total filler inventory conserved within plus or minus 5 percent of a matched uniform control — is both a performance enabler and a commercial argument. It means the zone-modulated body is cost-neutral relative to a uniform pad of the same nominal specification, so the hotspot benefit costs nothing in filler spend. The registration targets filler fraction, explicitly not thickness and not particle orientation, which is a deliberate distinction from prior-art approaches that modulate bond-line thickness or use directed-field processes to orient anisotropic platelets. Matrix and crosslinker chemistry are deliberately broad: silicone, epoxy, and vitrimer (dynamic-network) systems are all covered. The dynamic-crosslinker dimension is particularly relevant for next-generation reworkable TIM formats, where the matrix can flow and re-seal under thermal cycling. The property target — 10 to 25 K hotspot peak-temperature reduction — is the single headline metric, and it is predicated on the peak or hot-zone temperature, not on area-average effective conductivity. Area-average conductivity may not improve and is not what the claim asserts. Computational validation used two independent finite-difference approaches: a 2D zone model sweeping approximately 1,100 boundary-condition combinations to characterize peak-temperature reduction across geometry and filler-contrast parameter space, and a convection-aware finite-difference sweep over heat-transfer coefficients from 10,000 to 100,000 W/m²·K representing the realistic range from air-cooled to advanced liquid-cooled accelerator packages. Both analyses consistently support the 10 to 25 K modeled reduction. Because this invention is a configuration over composite materials rather than a new crystalline solid, phonon-stability screening via machine-learning interatomic potentials is not the relevant validation tool; the computational proof lives in the thermal finite-difference analysis, and the open validation gate is physical coupon measurement.

We estimate the addressable market at more than $10 billion, anchored to the AI and high-bandwidth-memory TIM lane across AI accelerator packaging, GPU thermal management, HBM in-stack interfaces, and advanced packaging broadly. The named demand pool — NVIDIA Blackwell B200, AMD MI300X, HBM makers, and edge and inference accelerator vendors — represents the highest thermal design power packages on the market, where hotspot peak temperature governs both reliability and sustained performance. That concentration of demand in a small number of flagship programs also concentrates licensing leverage: a single OEM license covering TIM-1 in one accelerator generation can be commercially material. The royalty logic is clean. The claim is configuration-based and matrix-agnostic, so it applies on top of whatever filler chemistry a licensee already qualifies, minimizing switching friction and supporting a per-package or per-die running royalty on the thermal interface layer. A single-digit royalty on the qualified TIM bill of materials across millions of high-power packages annually produces a substantial revenue stream even at modest percentage rates. The mass-conservation feature supports the negotiating position directly: the licensee captures 10 to 25 K of peak-temperature relief at zero incremental filler cost, so the royalty is paid against a benefit that has no material cost offset, which is an unusually clean ROI argument for licensing discussions with cost-sensitive OSATs and accelerator vendors. The glass-core and high-thermal-design-power transition is the race window. As substrates move from organic laminates to glass cores and TDP continues to rise, the thermal budget at TIM-1 tightens and the cost of throttling events rises. A configuration innovation that can be inserted into the existing supply chain without chemistry reformulation is best positioned to capture value during a transition rather than after it.

peak-T reduction without increasing filler mass; preserves premium-filler economics while addressing hotspot-dominated reliability

single continuous body claimed as article independent of any field/manipulator process; registration of in-plane filler FRACTION (not thickness, not particle orientation) to a CONTINUOUS heat-flux map (not a discrete hotspot); express conservation of total filler mass/volume vs uniform-control

The most natural acquirers and licensees are the accelerator designers whose packages define the demand: NVIDIA (Blackwell B200 and successors), AMD (MI300X and successors), HBM stack manufacturers, and edge and inference accelerator vendors. For these strategics, a field-of-use license covering TIM-1 in high-power accelerator packages is the likely structure — it allows zone modulation to be applied atop an already-qualified filler system without requiring chemistry re-qualification, which is the dominant switching cost in thermal interface adoption. The article-per-se and deposition-system sibling claims create independent licensing paths to TIM merchant suppliers and packaging equipment vendors, broadening the buyer universe beyond device OEMs. An incumbent TIM materials house — a supplier already selling premium boron-nitride or aluminum-nitride pads into the accelerator channel — is a strong acquisition candidate, because a broad or exclusive license on the zone-modulation configuration would let it offer differentiated products atop its existing filler technology and supply chain without conceding the channel to a new entrant. Because the claim is matrix-agnostic, a single buyer can monetize it across multiple filler chemistries and multiple customer relationships simultaneously. That flexibility argues for a non-exclusive licensing program for maximum reach, or for a targeted acquisition by a single accelerator leader seeking to lock in exclusivity at the package level during the current glass-core transition before the configuration becomes industry standard.

The principal risk is that current performance evidence is modeled rather than measured. The 10 to 25 K peak-temperature reduction derives from finite-difference simulation, and the claim is expressly predicated on peak or hot-zone benefit — not area-average effective conductivity, which may not improve. A buyer pricing this asset must discount the measured-to-modeled gap until the patterned-heater coupon is run. The coupon protocol is defined and the experiment is inexpensive; the gap is a timeline and funding question, not a technical unknown, but it is real and should be reflected in terms. A second risk is enforceability of the article-per-se posture: verifying that phi(x,y) is registered to q(x,y) and that mass conservation holds within plus or minus 5 percent may require destructive cross-section analysis or tomography post-manufacture, which complicates enforcement against a supplier who disputes infringement. A third risk is design-around pressure: competitors seeking to achieve spatial non-uniformity through filler-orientation fields, bond-line-thickness grading, or discrete patch schemes are constrained by the claim carve-outs, but aggressive prosecution of alternative approaches in those spaces by well-resourced incumbents is foreseeable. The mitigation for the first risk is completing the two open bench experiments before or concurrent with filing the provisional. The mitigation for the second and third is disciplined claim construction and continued monitoring of the Henkel and NVIDIA filing families identified in the freedom-to-operate scan.