huh ... Seems like the patents might be expired? https://patents.google.com/patent/US8131597 https://patents.google.com/patent/US8131597 https://patents.google

huh ... Seems like the patents might be expired? https://patents.google.com/patent/US8131597 https://patents.google.com/patent/US8131597 https://patents.google.com/patent/US6199048 https://patents.google.com/patent/US6199048