according to his site he is focused on research and development
and not a manufacture, if he does not build units for sale he is
not infringing on anyones patent, correct?

if they are trying to enforce patent rights based on the attachment
of a generator so that it is freefloating, that drive system has been in use
for years, by diyers that connect an alternator to the shaft of a briggs and stratton or the like shaft to shaft with a solid coupler.

as a matter of fact that is exactly what i use to test power input to rewound alternators for my own amusement,

is there more to the story?

if not, if i were Klaus i would tell them to pound sand
let them hire an atty to draft a letter to cease and desist
which i am sure they could do for 50bucks with some ambulance chaser.

i see no way however that there claim would hold up in court, all Klaus would have to do is demonstrate how another type of brg in the drive system would have benefit
and he therefore would clear the patent.

seems like a bunch of crap to me.