Collagen patents US3121049A-Nippi-collagen-disperson US4285986-oligopeptide US7906623B2-defatting US8568807B2-Viscofan-casing-end-closing US20110287148A1-Viscofan-high-cling-casing US20200188555A1-Viscofan-tissue-patch US2461602A-suture US2570443A-animal-fiber-products US3114591A-Ethicon-suture-from-tendon US3194865A-Johnson-hide-corium-fibril US3894132-collagen-disperson US4021522-collagen-disperson US5820812-Nitta-casing-UV US5480427-collagen-implants US3894158-Devro-casing US20050031741A1_Devro_Collagen-casing US10849330B2_2020_Devro_Sausage-casings US4406853-collagen-condom US4626286-collagen-condom US4388331-1983-Devro-Soft-bite-casing-by- proteolytic-enzyme US3535125A-Devro-1970-Edible-collagen-casing-manufacuring-process US2246236A-Naturin-1939-artificial-casing US2115607A-Naturin-1938-Sausage-casing US3123482A-1964-J&J-Collagen-casing US3122788A-1964-J&J-Collagen-casing