发明授权
- 专利标题: Binder for perforated sheets or the like
- 专利标题(中): 穿孔板等的粘合剂
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申请号: US234364申请日: 1981-01-13
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公开(公告)号: US4374627A公开(公告)日: 1983-02-22
- 发明人: Michael N. Friedman
- 申请人: Michael N. Friedman
- 专利权人: Friedman Michael N
- 当前专利权人: Friedman Michael N
- 主分类号: B42B5/10
- IPC分类号: B42B5/10 ; B42F13/10 ; B42F13/18
摘要:
A two part binder for perforated sheets or the like in which a toothed binder member is provided with a constant opening through which sheets are moved for binding engagement with and disengagement from the teeth of the binder member. Another member closes the opening and has tracks for frictional engagement with the sides of the opening to prevent separation of the members in response to the application of the separating force.
公开/授权文献
- US6134296A Microgradient intensity modulating multi-leaf collimator 公开/授权日:2000-10-17
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