Search Results for: Incandescent gas mantles not impregnated
(class / ) inorganic carbon containing coating, not as steel (e.g., carbide, etc.)
components (class / ) coating opposite sides or forming plural or nonuniform coats (class / ) carbon paper type (class / ) removable protective coating applied (class / ) organic base (class / ) metal base (class / ) fluorescent or phosphorescent coating (class / ) optical brightening (class / ) incandescent...
https://patents.justia.com/patents-by-us-classification/427