Microvision Granted US Patent ‘Alteration of resonant mode frequency response in mechanically resonant device’
https://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.htm&r=4137&f=G&l=50&d=PTXT&p=83&S1=20220329&OS=20220329&RS=20220329