Edit, did some searching...
1999 first publish date for the mentioned flux damper patent (XX-1). Which means it expires any day now. Or has. It being 2020 and all that.
If it is good, then the copies will come piling in. Or more correctly, out, into the market.
The backside to that argument is...not everyone will recognize the potential value of the flux damper system, and it may not be copied, even if it is finally 'legal' to do so.