Tokyo Electron's 2025 Vertical-DRAM Patent: When the Equipment Maker Owns the Recipe

The capex-meets-IP fact first: a large share of process know-how lives not with the chipmakers but with the equipment vendors who build the tools and co-develop the recipes. US12432901B2, granted September 2025 to Tokyo Electron, patents technologies for fabricating a vertical DRAM structure (CPC H10B 12/0383).

Gloss it once. Vertical (3D) DRAM is the hard next step for memory scaling, requiring new deposition, etch, and patterning sequences. Tokyo Electron makes the deposition and etch tools that perform those steps. Patenting the fabrication technology means the tool vendor holds part of the recipe the memory makers will need to manufacture 3D DRAM.

“Technologies for fabricating a vertical dynamic random access memory (DRAM) structure include forming a DRAM cell hole through a word line layer and an associated substrate such that a first section of the DRAM cell hole extends through the word line layer and a second section of the DRAM cell hole…”— U.S. Patent No. 12,432,901 source

Why a capex desk reads it: this reframes who captures value in a node transition. When the equipment vendor owns fabrication IP for a future memory generation, it strengthens the vendor's pricing power and locks the chipmakers into its tools. The capex that memory makers spend partly flows to the vendors who hold the enabling process IP.

The period framing matters. By 2025, the industry was actively developing 3D DRAM, and the equipment makers were co-inventing the process. A Tokyo Electron grant on vertical-DRAM fabrication marks the tool vendor staking IP in the recipe for the frontier memory architecture.

The caveat we attach: this is a fabrication-technology patent and a defensive asset. It evidences Tokyo Electron's process IP position; it does not establish adoption or quantify value capture.

For the period investor, the durable point is that the equipment vendors are not passive suppliers — they own process IP that shapes who profits from the next memory generation. A 2025 vertical-DRAM fabrication grant is a marker of that leverage.