If Sandia's 2025 patent fenced an SST's protection and Georgia Tech's fenced a multiport router, US12418244B2, granted to Nanyang Technological University on September 16, 2025, fences the controller — the brain that coordinates the box.
Claim 1's subject is the SST controller. The CPC tags are tight power-electronics: H02M 5/4585 (AC-to-AC conversion via a DC link, the SST's basic structure) and H02M 3/155 (DC-DC regulation). A solid-state transformer is a stack of converter stages; the controller is what orchestrates them to deliver the transformer function — voltage transformation, isolation, power-flow control — electronically.
Reading the limitation: the novelty is in the control logic, not the converter topology (which has extensive prior art) and not the SST concept (decades old). Fencing the controller is fencing how the stages are coordinated — a defensible target because every SST needs a controller and the coordination problem is genuinely hard.
The strategic pattern across 2025 is what makes this interesting. Three research institutions — Nanyang (controller), Sandia (protection), Georgia Tech (multiport routing) — each fenced a different sub-problem of the SST in the same year. That is not coincidence; it is the academy partitioning a foundational device into separately-patentable pieces, each defensible on its own.
The lab-IP caution: a university controller patent is research IP for licensing, not a product. Its value is realized when a commercializer (Huawei is the obvious candidate, already filing SST reliability IP) needs the control method and must license or design around it. For the landscape, Nanyang's grant is one tile in a 2025 mosaic of SST research IP — the foundational ground being staked before the commercial wave that the field keeps anticipating arrives.