Sorry about one bad edit earlier but its a cluster to edit with a lot of repeating words.  In any case I added a sentence that highlights the difference between the legal and popular use.  This is supported by youtube clips which should be fine for citing popular use.  Just for the future use, my search of the patent found "fuel cell" used 6 times and "water fuel cell" used 2 times.  I added the line citation for the missing water fuel cell reference.  I took out one sentence because it seemed like slightly off topic.  In any case the passage is now painfully technical (in terms of law and science) when it could be succinct (if only we could stipulate a few things) but it still works for me.