All four applications were filed with the USPTO within days of each other in July 2026. A 12-month PCT window remains open for international filing.
Integration claims spanning all subsystems — the synergy patent covering how the other three innovations work together as a single system.
PPA-A, PPA-B, and PPA-C protect the individual components and are licensable to existing CSP developers upgrading incumbent plants.
PPA-D protects the integration itself — how the components work together — not just the individual parts.
Trade secrets in commissioning procedure, control logic, and salt chemistry, held outside the patent filings entirely.
Claude and Grok say AI data centers urgently need this power infrastructure upgrade if they are to continue to develop. This exact market is already being funded, at scale — by Sam Altman, with a significantly inferior architecture.
Raised $140M in under two years for modular solar-thermal storage targeting AI data centers, with a 90 GWh project backlog already booked and a target of 1¢/kWh dispatchable power. This validates the market for solar-thermal storage at data-center scale — but Exowatt's architecture has no PV co-generation, no process heat output, and no filed patent estate in this specific integration.