Canada LegalCanadian Patent for Biodegradable Filter by Axel BarrettJuly 22, 2022July 22, 2022 Leave a Comment on Canadian Patent for Biodegradable Filter Greenbutts received a Canadian patent for biodegradable filter tow technology. Buy a Subscription Today Access all content on this site by buying a subscription. More Info Buy Log in Share this:Tweet Echo Instruments, Technology to Measure & Analyse Plastic Biodegradation (FREE) Like this:Like Loading...