There are some significant differences in design, and the core of the technology was covered by long-expired patents (now public domain). If you notice, Bob continues to use radioactive elements for catalyst, while John figured out how to do away with them. John has also added electronic control (presumably patentable). Anyone can recreate the original engine and John actually encourages it. I believe they've "open sourced" some type of simple cylinder configuration.
"In a 1.5-hour interview, John Rohner describes the latest progress in their technology and in their business plans to bring the technology to market, perhaps by this September. Within three years, the 2-cylinder engine that produces 400 HP (300 kW) could cost as little as $275."
http://pesn.com/2012/04/15/9602075_Intel..._Roll-out/
Here's John discussing his engine:
"In a 1.5-hour interview, John Rohner describes the latest progress in their technology and in their business plans to bring the technology to market, perhaps by this September. Within three years, the 2-cylinder engine that produces 400 HP (300 kW) could cost as little as $275."
http://pesn.com/2012/04/15/9602075_Intel..._Roll-out/
Here's John discussing his engine:
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