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Patent portfolio assigned to Emission Free Generators (verified via public assignee records). Estimated patent count: 4. Hydrogen-on-demand portable generator (ZenH2), San Diego CA, pre-production (mid-2026). San Diego Business Journal reports 'four patents on its technology and is going for two more'; exact count not directly verifiable (SDBJ paywalled, opened via search snippet). No named customers (pre-launch, raising on Wefunder). No direct competitors named on sources fetched.