-
公开(公告)号：US3822949A
公开(公告)日：1974-07-09
申请号：US6031870
申请日：1970-08-03
申请人： DART IND INC
发明人： DICK F
CPC分类号： B43K7/08
摘要： A pen plug particularly useful in ballpoint pens as a stopper to prevent back leakage of ink from the ink reservoir of such pens and yet function to allow passage of air into the pen interior. Such plugs include a plurality of substantially continuous synthetic filaments such as cellulose acetate, natural fibrous threads and synthetic filaments or mixtures of differing synthetic filaments encased in a plastic sheath.
搜索结果
1 条记录 (耗时 0.011 秒)
筛选
AND
AND
过滤
NOT
NOT
扫码加群
