Search Results for: Animal horn-cores treated with acid
(class / ) animal or plant matter (e.g., blood, hair, skin, wood, hemp, cotton, paper, lard, castor oil, shellac, glue, beeswax, etc.) (class / ) elemental or alloyed metal (class / ) halogen compound (class / ) silicon compound (class / ) heavy metal or aluminum compound (e.g., mos ,etc.)
(class / ) silicon dioxide, silicic acid, orthosilicate, or metasilicate, including surface-treated (e.g., clays, onium clays, estersils, etc.)...
https://patents.justia.com/patents-by-us-classification/508