US Trademark Classification US16 Paper and stationery 铅笔芯替芯（016-3605） Class 16 铅笔芯替芯 016-3605 Chinese 铅笔芯替芯 English Pencil lead refills Term ID 016-3605 Class 16 Type Goods Status Active · added, not since modified (A) Effective date 2024-03-21 Version 12-2024